1
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Timmer D, Lünemann DC, Riese S, Sio AD, Lienau C. Full visible range two-dimensional electronic spectroscopy with high time resolution. OPTICS EXPRESS 2024; 32:835-847. [PMID: 38175103 DOI: 10.1364/oe.511906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 12/14/2023] [Indexed: 01/05/2024]
Abstract
Two-dimensional electronic spectroscopy (2DES) is a powerful method to study coherent and incoherent interactions and dynamics in complex quantum systems by correlating excitation and detection energies in a nonlinear spectroscopy experiment. Such dynamics can be probed with a time resolution limited only by the duration of the employed laser pulses and in a spectral range defined by the pulse spectrum. In the blue spectral range (<500 nm), the generation of sufficiently broadband ultrashort pulses with pulse durations of 10 fs or less has been challenging so far. Here, we present a 2DES setup based on a hollow-core fiber supercontinuum covering the full visible range (400-700 nm). Pulse compression via custom-made chirped mirrors yields a time resolution of <10 fs. The broad spectral coverage, in particular the extension of the pulse spectra into the blue spectral range, unlocks new possibilities for coherent investigations of blue-light absorbing and multichromophoric compounds, as demonstrated by a 2DES measurement of chlorophyll a.
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2
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Husakou A, Babushkin I, Fedotova O, Rusetsky R, Smirnova T, Khasanov O, Fedotov A, Sapaev U, Apostolova T. Tunable in situ near-UV pulses by transient plasmonic resonance in nanocomposites. OPTICS EXPRESS 2023; 31:37275-37283. [PMID: 38017860 DOI: 10.1364/oe.501153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 09/21/2023] [Indexed: 11/30/2023]
Abstract
We propose a concept for generation of ultrashort pulses based on transient field-induced plasmonic resonance in nanoparticle composites. Photoionization and free-carrier plasma generation change the susceptibility of nanoparticles on a few-femtosecond scale under the action of the pump pulse. This opens a narrow time window when the system is in plasmonic resonance, which is accompanied by a short burst of the local field. During this process, frequency-tunable few-fs pulses can be emitted. This paves a way to ultra-compact yet efficient generation of ultrashort pulses at short wavelengths.
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3
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Hu F, Wang Z, Yao Q, Cao W, Zhang Q, Lu P. Clean hundred-µJ-level sub-6-fs blue pulses generated with helium-assisted solid thin plates. OPTICS LETTERS 2023; 48:2555-2558. [PMID: 37186707 DOI: 10.1364/ol.487415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
In this work, 85 µJ, 5.5 fs pulses spanning 350-500 nm with 96% energy concentrated on the main pulse are generated by pulse compression using a helium-assisted, two-stage solid thin plate apparatus. To the best of our knowledge, these are the highest energy sub-6 fs blue pulses obtained to date. Furthermore, during the spectral broadening process, we observe that solid thin plates are much more easily damaged by blue pulses in a vacuum than in a gas-filled environment at the same field intensity. Helium, with the highest ionization energy and extremely low material dispersion, is adopted to create a gas-filled environment. Thus, the damage to solid thin plates is eliminated, and high-energy, clean pulses can be obtained with only two commercially available chirped mirrors in a chamber. Furthermore, the excellent output power stability of 0.39% root mean square (rms) fluctuations over 1 h is maintained. We believe that few-cycle blue pulses at the hundred-µJ level can open the door to numerous new ultrafast and strong-field applications in this spectral region.
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4
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Kumar A, Malevich P, Mewes L, Wu S, Barham JP, Hauer J. Transient absorption spectroscopy based on uncompressed hollow core fiber white light proves pre-association between a radical ion photocatalyst and substrate. J Chem Phys 2023; 158:144201. [PMID: 37061463 DOI: 10.1063/5.0142225] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2023] Open
Abstract
We present a hollow-core fiber (HCF) based transient absorption experiment, with capabilities beyond common titanium:sapphire based setups. By spectral filtering of the HCF spectrum, we provide pump pulses centered at 425 nm with several hundred nJ of pulse energy at the sample position. By employing the red edge of the HCF output for seeding CaF2, we obtain smooth probing spectra in the range between 320 and 900 nm. We demonstrate the capabilities of our experiment by following the ultrafast relaxation dynamics of a radical cationic photocatalyst to prove its pre-association with an arene substrate, a phenomenon that was not detectable previously by steady-state spectroscopic techniques. The detected preassembly rationalizes the successful participation of radical ionic photocatalysts in single electron transfer reactions, a notion that has been subject to controversy in recent years.
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Affiliation(s)
- Ajeet Kumar
- Department of Chemistry and Catalysis Research Center (CRC), School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany
| | - Pavel Malevich
- Department of Chemistry and Catalysis Research Center (CRC), School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany
| | - Lars Mewes
- Department of Chemistry and Catalysis Research Center (CRC), School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany
| | - Shangze Wu
- Universität Regensburg, Fakultät für Chemie und Pharmazie, 93040 Regensburg, Germany
| | - Joshua P Barham
- Universität Regensburg, Fakultät für Chemie und Pharmazie, 93040 Regensburg, Germany
| | - Jürgen Hauer
- Department of Chemistry and Catalysis Research Center (CRC), School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany
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5
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TeV/m catapult acceleration of electrons in graphene layers. Sci Rep 2023; 13:1330. [PMID: 36693925 PMCID: PMC9873800 DOI: 10.1038/s41598-023-28617-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 01/20/2023] [Indexed: 01/25/2023] Open
Abstract
Recent nanotechnology advances enable fabrication of layered structures with controllable inter-layer gap, giving the ultra-violet (UV) lasers access to solid-state plasmas which can be used as medium for electron acceleration. By using a linearly polarized 3 fs-long laser pulse of 100 nm wavelength and 10[Formula: see text] W/cm[Formula: see text] peak intensity, we show numerically that electron bunches can be accelerated along a stack of ionized graphene layers. Particle-In-Cell (PIC) simulations reveal a new self-injection mechanism based on edge plasma oscillations, whose amplitude depends on the distance between the graphene layers. Nanometre-size electron ribbons are electrostatically catapulted into buckets of longitudinal electric fields in less than 1 fs, as opposed to the slow electrostatic pull, common to laser wakefield acceleration (LWFA) schemes in gas-plasma. Acceleration then proceeds in the blowout regime at a gradient of 4.79 TeV/m yielding a 0.4 fs-long bunch with a total charge in excess of 2.5 pC and an average energy of 6.94 MeV, after travelling through a graphene target as short as 1.5 [Formula: see text]m. These parameters are unprecedented within the LWFA research area and, if confirmed experimentally, may have an impact on fundamental femtosecond research.
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6
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Teles-Ferreira DC, Manzoni C, Martínez-Fernández L, Cerullo G, de Paula AM, Borrego-Varillas R. Ultrafast Excited-State Decay Mechanisms of 6-Thioguanine Followed by Sub-20 fs UV Transient Absorption Spectroscopy. Molecules 2022; 27:molecules27041200. [PMID: 35208987 PMCID: PMC8878119 DOI: 10.3390/molecules27041200] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 02/01/2022] [Accepted: 02/02/2022] [Indexed: 11/23/2022] Open
Abstract
Understanding the primary steps following UV photoexcitation in sulphur-substituted DNA bases (thiobases) is fundamental for developing new phototherapeutic drugs. However, the investigation of the excited-state dynamics in sub-100 fs time scales has been elusive until now due to technical challenges. Here, we track the ultrafast decay mechanisms that lead to the electron trapping in the triplet manifold for 6-thioguanine in an aqueous solution, using broadband transient absorption spectroscopy with a sub-20 fs temporal resolution. We obtain experimental evidence of the fast internal conversion from the S2(ππ*) to the S1(nπ*) states, which takes place in about 80 fs and demonstrates that the S1(nπ*) state acts as a doorway to the triplet population in 522 fs. Our results are supported by MS-CASPT2 calculations, predicting a planar S2(ππ*) pseudo-minimum in agreement with the stimulated emission signal observed in the experiment.
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Affiliation(s)
| | - Cristian Manzoni
- Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche (IFN-CNR), Piazza Leonardo da Vinci 32, I-20133 Milano, Italy; (C.M.); (G.C.)
| | - Lara Martínez-Fernández
- Departamento de Química, Facultad de Ciencias and Institute for Advanced Research in Chemistry (IADCHEM), Campus de Excelencia UAM-CSIC, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain;
| | - Giulio Cerullo
- Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche (IFN-CNR), Piazza Leonardo da Vinci 32, I-20133 Milano, Italy; (C.M.); (G.C.)
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Ana Maria de Paula
- Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, MG, Brazil;
| | - Rocío Borrego-Varillas
- Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche (IFN-CNR), Piazza Leonardo da Vinci 32, I-20133 Milano, Italy; (C.M.); (G.C.)
- Correspondence:
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7
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Hu F, Zhang Q, Cao J, Hong Z, Cao W, Lu P. Generation of 5.2 fs, energy scalable blue pulses. OPTICS LETTERS 2022; 47:389-392. [PMID: 35030613 DOI: 10.1364/ol.447424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 12/13/2021] [Indexed: 06/14/2023]
Abstract
In this Letter, ultrashort blue pulses spanning 350-500 nm are generated by combining the broadband frequency doubling technology with the two-stage multiplate continuum (MPC) generation scheme. We prepare relatively broadband input pulses and use a two-stage configuration for MPC generation, allowing us to employ thinner and less solid plates for further spectral broadening. Therefore, the deteriorations of the spectral phase, energy conversion efficiency, and beam quality, which occur more easily for 400 nm pulses, are effectively suppressed. After fine dispersion management, we obtain clean 5.2 fs blue pulses with a root-mean-square energy stability of 0.69% over one hour and excellent beam quality. Furthermore, lower than 8% energy loss during the spectral broadening process at each stage is achieved. The overall optimized performances and energy scalability of this blue pulse, as well as the possibility of further compressing the pulse duration, are likely to motivate more strong-field research with sub-cycle time resolution in this extended wavelength range.
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8
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Teles-Ferreira DC, van Stokkum IH, Conti I, Ganzer L, Manzoni C, Garavelli M, Cerullo G, Nenov A, Borrego Varillas R, de Paula AM. Coherent vibrational modes promote the ultrafast internal conversion and intersystem crossing in thiobases. Phys Chem Chem Phys 2022; 24:21750-21758. [DOI: 10.1039/d2cp02073d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Thionated nucleobases are obtained by replacing oxygen with sulphur atoms in the canonical nucleobases. They absorb light efficiently in the near-ultraviolet, populating singlet states which undergo intersystem crossing to the...
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9
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Mewes L, Ingle RA, Al Haddad A, Chergui M. Broadband visible two-dimensional spectroscopy of molecular dyes. J Chem Phys 2021; 155:034201. [PMID: 34293898 DOI: 10.1063/5.0053554] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Two-dimensional Fourier transform spectroscopy is a promising technique to study ultrafast molecular dynamics. Similar to transient absorption spectroscopy, a more complete picture of the dynamics requires broadband laser pulses to observe transient changes over a large enough bandwidth, exceeding the inhomogeneous width of electronic transitions, as well as the separation between the electronic or vibronic transitions of interest. Here, we present visible broadband 2D spectra of a series of dye molecules and report vibrational coherences with frequencies up to ∼1400 cm-1 that were obtained after improvements to our existing two-dimensional Fourier transform setup [Al Haddad et al., Opt. Lett. 40, 312-315 (2015)]. The experiment uses white light from a hollow core fiber, allowing us to acquire 2D spectra with a bandwidth of 200 nm, in a range between 500 and 800 nm, and with a temporal resolution of 10-15 fs. 2D spectra of nile blue, rhodamine 800, terylene diimide, and pinacyanol iodide show vibronic spectral features with at least one vibrational mode and reveal information about structural motion via coherent oscillations of the 2D signals during the population time. For the case of pinacyanol iodide, these observations are complemented by its Raman spectrum, as well as the calculated Raman activity at the ground- and excited-state geometry.
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Affiliation(s)
- Lars Mewes
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
| | - Rebecca A Ingle
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
| | - Andre Al Haddad
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
| | - Majed Chergui
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
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10
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Kuramochi H, Tahara T. Tracking Ultrafast Structural Dynamics by Time-Domain Raman Spectroscopy. J Am Chem Soc 2021; 143:9699-9717. [PMID: 34096295 PMCID: PMC9344463 DOI: 10.1021/jacs.1c02545] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
![]()
In traditional Raman spectroscopy,
narrow-band light is irradiated
on a sample, and its inelastic scattering, i.e., Raman scattering,
is detected. The energy difference between the Raman scattering and
the incident light corresponds to the vibrational energy of the molecule,
providing the Raman spectrum that contains rich information about
the molecular-level properties of the materials. On the other hand,
by using ultrashort optical pulses, it is possible to induce Raman-active
coherent nuclear motion of the molecule and to observe the molecular
vibration in real time. Moreover, this time-domain Raman measurement
can be combined with femtosecond photoexcitation, triggering chemical
changes, which enables tracking ultrafast structural dynamics in a
form of “time-resolved” time-domain Raman spectroscopy,
also known as time-resolved impulsive stimulated Raman spectroscopy.
With the advent of stable, ultrashort laser pulse sources, time-resolved
impulsive stimulated Raman spectroscopy now realizes high sensitivity
and a wide detection frequency window from THz to 3000 cm–1, and has seen success in unveiling the molecular mechanisms underlying
the efficient functions of complex molecular systems. In this Perspective,
we overview the present status of time-domain Raman spectroscopy,
particularly focusing on its application to the study of femtosecond
structural dynamics. We first explain the principle and a brief history
of time-domain Raman spectroscopy and then describe the apparatus
and recent applications to the femtosecond dynamics of complex molecular
systems, including proteins, molecular assemblies, and functional
materials. We also discuss future directions for time-domain Raman
spectroscopy, which has reached a status allowing a wide range of
applications.
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Affiliation(s)
- Hikaru Kuramochi
- Molecular Spectroscopy Laboratory, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan
- Ultrafast Spectroscopy Research Team, RIKEN Center for Advanced Photonics (RAP), 2-1 Hirosawa, Wako 351-0198, Japan
- Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
- JST, PRESTO, 4-1-8 Honcho, Kawaguchi 332-0012, Japan
| | - Tahei Tahara
- Molecular Spectroscopy Laboratory, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan
- Ultrafast Spectroscopy Research Team, RIKEN Center for Advanced Photonics (RAP), 2-1 Hirosawa, Wako 351-0198, Japan
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11
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Revealing electronic state-switching at conical intersections in alkyl iodides by ultrafast XUV transient absorption spectroscopy. Nat Commun 2020; 11:4042. [PMID: 32788648 PMCID: PMC7423985 DOI: 10.1038/s41467-020-17745-w] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 07/06/2020] [Indexed: 11/11/2022] Open
Abstract
Conical intersections between electronic states often dictate the chemistry of photoexcited molecules. Recently developed sources of ultrashort extreme ultraviolet (XUV) pulses tuned to element-specific transitions in molecules allow for the unambiguous detection of electronic state-switching at a conical intersection. Here, the fragmentation of photoexcited iso-propyl iodide and tert-butyl iodide molecules (i-C3H7I and t-C4H9I) through a conical intersection between 3Q0/1Q1 spin–orbit states is revealed by ultrafast XUV transient absorption measuring iodine 4d core-to-valence transitions. The electronic state-sensitivity of the technique allows for a complete mapping of molecular dissociation from photoexcitation to photoproducts. In both molecules, the sub-100 fs transfer of a photoexcited wave packet from the 3Q0 state into the 1Q1 state at the conical intersection is captured. The results show how differences in the electronic state-switching of the wave packet in i-C3H7I and t-C4H9I directly lead to differences in the photoproduct branching ratio of the two systems. The reaction trajectories of photoexcited molecules may involve transitions through conical intersections, which are ubiquitous in nature but challenging to characterize. Here the authors provide a complete mapping of molecular dissociation of two model alkyl halides by ultrafast XUV transient absorption.
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12
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Portone A, Borrego-Varillas R, Ganzer L, Di Corato R, Qualtieri A, Persano L, Camposeo A, Cerullo G, Pisignano D. Conformable Nanowire-in-Nanofiber Hybrids for Low-Threshold Optical Gain in the Ultraviolet. ACS NANO 2020; 14:8093-8102. [PMID: 32419446 PMCID: PMC7393628 DOI: 10.1021/acsnano.0c00870] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 05/08/2020] [Indexed: 05/08/2023]
Abstract
The miniaturization of diagnostic devices that exploit optical detection schemes requires the design of light sources combining small size, high performance for effective excitation of chromophores, and mechanical flexibility for easy coupling to components with complex and nonplanar shapes. Here, ZnO nanowire-in-fiber hybrids with internal architectural order are introduced, exhibiting a combination of polarized stimulated emission, low propagation losses of light modes, and structural flexibility. Ultrafast transient absorption experiments on the electrospun material show optical gain which gives rise to amplified spontaneous emission with a threshold lower than the value found in films. These systems are highly flexible and can conveniently conform to curved surfaces, which makes them appealing active elements for various device platforms, such as bendable lasers, optical networks, and sensors, as well as for application in bioimaging, photo-cross-linking, and optogenetics.
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Affiliation(s)
- Alberto Portone
- NEST,
Istituto Nanoscienze-CNR, Piazza S. Silvestro 12, I-56127 Pisa, Italy
- NEST,
Scuola Normale Superiore, Piazza S. Silvestro 12, I-56127 Pisa, Italy
- Dipartimento
di Matematica e Fisica “Ennio De Giorgi”, Università del Salento, Via Arnesano, I-73100 Lecce, Italy
| | - Rocio Borrego-Varillas
- IFN-CNR,
Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, I-20133 Milano, Italy
| | - Lucia Ganzer
- IFN-CNR,
Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, I-20133 Milano, Italy
| | - Riccardo Di Corato
- Institute
for Microelectronics and Microsystems, CNR-IMM, Campus Ecotekne, Via Monteroni, I-73100 Lecce, Italy
| | - Antonio Qualtieri
- Center
for Biomolecular Nanotechnologies, Istituto
Italiano di Tecnologia, Via Barsanti, I-73010 Arnesano, Italy
| | - Luana Persano
- NEST,
Istituto Nanoscienze-CNR, Piazza S. Silvestro 12, I-56127 Pisa, Italy
- NEST,
Scuola Normale Superiore, Piazza S. Silvestro 12, I-56127 Pisa, Italy
| | - Andrea Camposeo
- NEST,
Istituto Nanoscienze-CNR, Piazza S. Silvestro 12, I-56127 Pisa, Italy
- NEST,
Scuola Normale Superiore, Piazza S. Silvestro 12, I-56127 Pisa, Italy
| | - Giulio Cerullo
- IFN-CNR,
Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, I-20133 Milano, Italy
| | - Dario Pisignano
- NEST,
Istituto Nanoscienze-CNR, Piazza S. Silvestro 12, I-56127 Pisa, Italy
- Dipartimento
di Fisica, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
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13
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Barreau L, Ross AD, Garg S, Kraus PM, Neumark DM, Leone SR. Efficient table-top dual-wavelength beamline for ultrafast transient absorption spectroscopy in the soft X-ray region. Sci Rep 2020; 10:5773. [PMID: 32238820 PMCID: PMC7113301 DOI: 10.1038/s41598-020-62461-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 03/09/2020] [Indexed: 11/08/2022] Open
Abstract
We present a table-top beamline providing a soft X-ray supercontinuum extending up to 370 eV from high-order harmonic generation with sub-13 fs 1300 nm driving pulses and simultaneous production of sub-5 fs pulses centered at 800 nm. Optimization of high harmonic generation in a long and dense gas medium yields a photon flux of ~ 1.4 × 106 photons/s/1% bandwidth at 300 eV. The temporal resolution of X-ray transient absorption experiments with this beamline is measured to be 11 fs for 800 nm excitation. This dual-wavelength approach, combined with high flux and high spectral and temporal resolution soft X-ray absorption spectroscopy, is a new route to the study of ultrafast electronic dynamics in carbon-containing molecules and materials at the carbon K-edge.
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Affiliation(s)
- Lou Barreau
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Andrew D Ross
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Samay Garg
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - Peter M Kraus
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
- Advanced Research Center for Nanolithography (ARCNL), Science Park 106, 1098 XG, Amsterdam, The Netherlands
| | - Daniel M Neumark
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Stephen R Leone
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA.
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
- Department of Physics, University of California, Berkeley, CA, 94720, USA.
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14
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Teles‐Ferreira DC, Conti I, Borrego‐Varillas R, Nenov A, Van Stokkum IHM, Ganzer L, Manzoni C, Paula AM, Cerullo G, Garavelli M. A Unified Experimental/Theoretical Description of the Ultrafast Photophysics of Single and Double Thionated Uracils. Chemistry 2019; 26:336-343. [DOI: 10.1002/chem.201904541] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Indexed: 12/28/2022]
Affiliation(s)
- Danielle Cristina Teles‐Ferreira
- Departamento de Física Universidade Federal de Minas Gerais 31270-901 Belo Horizonte MG Brazil
- Electrical Engineering Department Federal Institute of Minas Gerais Formiga MG Brazil
| | - Irene Conti
- Dipartimento di Chimica Industriale Università degli Studi di Bologna Viale del Risorgimento 4 40136 Bologna Italy
| | - Rocío Borrego‐Varillas
- IFN-CNR Department of Physics Politecnico di Milano P.za L. da Vinci 32 20133 Milano Italy
| | - Artur Nenov
- Dipartimento di Chimica Industriale Università degli Studi di Bologna Viale del Risorgimento 4 40136 Bologna Italy
| | - Ivo H. M. Van Stokkum
- Department of Physics and Astronomy Faculty of Sciences Vrije Universiteit Amsterdam De Boelelaan 1081 1081HV Amsterdam The Netherlands
| | - Lucia Ganzer
- IFN-CNR Department of Physics Politecnico di Milano P.za L. da Vinci 32 20133 Milano Italy
| | - Cristian Manzoni
- IFN-CNR Department of Physics Politecnico di Milano P.za L. da Vinci 32 20133 Milano Italy
| | - Ana Maria Paula
- Departamento de Física Universidade Federal de Minas Gerais 31270-901 Belo Horizonte MG Brazil
| | - Giulio Cerullo
- IFN-CNR Department of Physics Politecnico di Milano P.za L. da Vinci 32 20133 Milano Italy
| | - Marco Garavelli
- Dipartimento di Chimica Industriale Università degli Studi di Bologna Viale del Risorgimento 4 40136 Bologna Italy
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15
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Teles-Ferreira DC, Borrego-Varillas R, Ganzer L, Nogueira Faria BE, Manzoni C, De Silvestri S, Nenov A, Conti I, Garavelli M, Cerullo G, de Paula AM. Intersystem crossing in thiobases proceeds by a dark intermediate state. EPJ WEB OF CONFERENCES 2019. [DOI: 10.1051/epjconf/201920510005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
4-thiouracil (4TU) is studied by transient absorption spectroscopy employing sub-20 fs UV-pulses and hybrid QM(CASPT2) / MM(AMBER) computations (static and dynamic), evidencing that, along the photoexcited relaxation pathway, intersystem crossing originates from a dark intermediate state.
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16
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Nenov A, Borrego-Varillas R, Oriana A, Ganzer L, Segatta F, Conti I, Manzoni C, Cerullo G, Garavelli M. UV-light induced vibrational coherences explain Kasha rule violation in frans-azobenzene. EPJ WEB OF CONFERENCES 2019. [DOI: 10.1051/epjconf/201920509016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Sub-20-fs transient absorption spectroscopy and simulations show that CNN-bendings dominate the sub-ps dynamics of ππ*-excited trans-azobenzene, thereby driving the system to the ground state through a non-productive decay channel in violation of the Kasha rule.
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17
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Song Y, Konar A, Sechrist R, Roy VP, Duan R, Dziurgot J, Policht V, Matutes YA, Kubarych KJ, Ogilvie JP. Multispectral multidimensional spectrometer spanning the ultraviolet to the mid-infrared. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:013108. [PMID: 30709236 DOI: 10.1063/1.5055244] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Accepted: 11/29/2018] [Indexed: 06/09/2023]
Abstract
Multidimensional spectroscopy is the optical analog to nuclear magnetic resonance, probing dynamical processes with ultrafast time resolution. At optical frequencies, the technical challenges of multidimensional spectroscopy have hindered its progress until recently, where advances in laser sources and pulse-shaping have removed many obstacles to its implementation. Multidimensional spectroscopy in the visible and infrared (IR) regimes has already enabled respective advances in our understanding of photosynthesis and the structural rearrangements of liquid water. A frontier of ultrafast spectroscopy is to extend and combine multidimensional techniques and frequency ranges, which have been largely restricted to operating in the distinct visible or IR regimes. By employing two independent amplifiers seeded by a single oscillator, it is straightforward to span a wide range of time scales (femtoseconds to seconds), all of which are often relevant to the most important energy conversion and catalysis problems in chemistry, physics, and materials science. Complex condensed phase systems have optical transitions spanning the ultraviolet (UV) to the IR and exhibit dynamics relevant to function on time scales of femtoseconds to seconds and beyond. We describe the development of the Multispectral Multidimensional Nonlinear Spectrometer (MMDS) to enable studies of dynamical processes in atomic, molecular, and material systems spanning femtoseconds to seconds, from the UV to the IR regimes. The MMDS employs pulse-shaping methods to provide an easy-to-use instrument with an unprecedented spectral range that enables unique combination spectroscopies. We demonstrate the multispectral capabilities of the MMDS on several model systems.
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Affiliation(s)
- Yin Song
- Department of Physics, University of Michigan, 450 Church St., Ann Arbor, Michigan 48109, USA
| | - Arkaprabha Konar
- Department of Physics, University of Michigan, 450 Church St., Ann Arbor, Michigan 48109, USA
| | - Riley Sechrist
- Department of Physics, University of Michigan, 450 Church St., Ann Arbor, Michigan 48109, USA
| | - Ved Prakash Roy
- Department of Chemistry, University of Michigan, 930 N University Ave., Ann Arbor, Michigan 48109, USA
| | - Rong Duan
- Department of Chemistry, University of Michigan, 930 N University Ave., Ann Arbor, Michigan 48109, USA
| | - Jared Dziurgot
- Department of Physics, University of Michigan, 450 Church St., Ann Arbor, Michigan 48109, USA
| | - Veronica Policht
- Department of Physics, University of Michigan, 450 Church St., Ann Arbor, Michigan 48109, USA
| | - Yassel Acosta Matutes
- Department of Physics, University of Michigan, 450 Church St., Ann Arbor, Michigan 48109, USA
| | - Kevin J Kubarych
- Department of Chemistry, University of Michigan, 930 N University Ave., Ann Arbor, Michigan 48109, USA
| | - Jennifer P Ogilvie
- Department of Physics, University of Michigan, 450 Church St., Ann Arbor, Michigan 48109, USA
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18
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Borrego-Varillas R, Teles-Ferreira DC, Nenov A, Conti I, Ganzer L, Manzoni C, Garavelli M, Maria de Paula A, Cerullo G. Observation of the Sub-100 Femtosecond Population of a Dark State in a Thiobase Mediating Intersystem Crossing. J Am Chem Soc 2018; 140:16087-16093. [DOI: 10.1021/jacs.8b07057] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Rocío Borrego-Varillas
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | | | - Artur Nenov
- Dipartimento di Chimica Industriale, Università degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
| | - Irene Conti
- Dipartimento di Chimica Industriale, Università degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
| | - Lucia Ganzer
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Cristian Manzoni
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Marco Garavelli
- Dipartimento di Chimica Industriale, Università degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
| | - Ana Maria de Paula
- Departamento de Física, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte-MG, Brazil
| | - Giulio Cerullo
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
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19
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Ultraviolet Transient Absorption Spectrometer with Sub-20-fs Time Resolution. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app8060989] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Towards Accurate Simulation of Two-Dimensional Electronic Spectroscopy. Top Curr Chem (Cham) 2018; 376:24. [DOI: 10.1007/s41061-018-0201-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 04/24/2018] [Indexed: 10/14/2022]
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21
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Nenov A, Borrego-Varillas R, Oriana A, Ganzer L, Segatta F, Conti I, Segarra-Marti J, Omachi J, Dapor M, Taioli S, Manzoni C, Mukamel S, Cerullo G, Garavelli M. UV-Light-Induced Vibrational Coherences: The Key to Understand Kasha Rule Violation in trans-Azobenzene. J Phys Chem Lett 2018; 9:1534-1541. [PMID: 29504764 DOI: 10.1021/acs.jpclett.8b00152] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We combine sub-20 fs transient absorption spectroscopy with state-of-the-art computations to study the ultrafast photoinduced dynamics of trans-azobenzene (AB). We are able to resolve the lifetime of the ππ* state, whose decay within ca. 50 fs is correlated to the buildup of the nπ* population and to the emergence of coherences in the dynamics, to date unobserved. Nonlinear spectroscopy simulations call for the CNN in-plane bendings as the active modes in the subps photoinduced coherent dynamics out of the ππ* state. Radiative to kinetic energy transfer into these modes drives the system to a high-energy planar nπ*/ground state conical intersection, inaccessible upon direct excitation of the nπ* state, that triggers an ultrafast (0.45 ps) nonproductive decay of the nπ* state and is thus responsible for the observed Kasha rule violation in UV excited trans-AB. On the other hand, cis-AB is built only after intramolecular vibrational energy redistribution and population of the NN torsional mode.
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Affiliation(s)
- Artur Nenov
- Dipartimento di Chimica Industriale , Università degli Studi di Bologna , Viale del Risorgimento 4 , I-40136 Bologna , Italy
| | - Rocio Borrego-Varillas
- IFN-CNR, Dipartimento di Fisica , Politecnico di Milano , Piazza Leonardo da Vinci 32 , I-20133 Milano , Italy
| | - Aurelio Oriana
- IFN-CNR, Dipartimento di Fisica , Politecnico di Milano , Piazza Leonardo da Vinci 32 , I-20133 Milano , Italy
| | - Lucia Ganzer
- IFN-CNR, Dipartimento di Fisica , Politecnico di Milano , Piazza Leonardo da Vinci 32 , I-20133 Milano , Italy
| | - Francesco Segatta
- Dipartimento di Chimica Industriale , Università degli Studi di Bologna , Viale del Risorgimento 4 , I-40136 Bologna , Italy
- European Center for Theoretical Studies in Nuclear Physics and Related Areas (ECT*-FBK) and Trento Institute for Fundamental Physics and Applications (TIFPA-INFN) , 38123 Trento , Italy
| | - Irene Conti
- Dipartimento di Chimica Industriale , Università degli Studi di Bologna , Viale del Risorgimento 4 , I-40136 Bologna , Italy
| | - Javier Segarra-Marti
- Laboratoire de Chimie UMR 5182 , Université Lyon, ENS de Lyon, CNRS, Université Lyon 1 , 46 Allée d'Italie , FR-69342 Lyon , France
| | - Junko Omachi
- Institute for Photon Science and Technology , University of Tokyo , 7-3-1 Hongo , Bunkyo-ku, Tokyo 113-0033 , Japan
| | - Maurizio Dapor
- European Center for Theoretical Studies in Nuclear Physics and Related Areas (ECT*-FBK) and Trento Institute for Fundamental Physics and Applications (TIFPA-INFN) , 38123 Trento , Italy
| | - Simone Taioli
- European Center for Theoretical Studies in Nuclear Physics and Related Areas (ECT*-FBK) and Trento Institute for Fundamental Physics and Applications (TIFPA-INFN) , 38123 Trento , Italy
- Faculty of Mathematics and Physics , Charles University , Praha 8 , 180 00 Prague , Czech Republic
| | - Cristian Manzoni
- IFN-CNR, Dipartimento di Fisica , Politecnico di Milano , Piazza Leonardo da Vinci 32 , I-20133 Milano , Italy
| | - Shaul Mukamel
- Department of Chemistry , University of California , Irvine , California 92697-2025 , United States
| | - Giulio Cerullo
- IFN-CNR, Dipartimento di Fisica , Politecnico di Milano , Piazza Leonardo da Vinci 32 , I-20133 Milano , Italy
| | - Marco Garavelli
- Dipartimento di Chimica Industriale , Università degli Studi di Bologna , Viale del Risorgimento 4 , I-40136 Bologna , Italy
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22
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Segarra-Martí J, Zvereva E, Marazzi M, Brazard J, Dumont E, Assfeld X, Haacke S, Garavelli M, Monari A, Léonard J, Rivalta I. Resolving the Singlet Excited State Manifold of Benzophenone by First-Principles Simulations and Ultrafast Spectroscopy. J Chem Theory Comput 2018; 14:2570-2585. [DOI: 10.1021/acs.jctc.7b01208] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Javier Segarra-Martí
- Université de Lyon, École Normale Supérieure de Lyon, CNRS, Université Claude Bernard Lyon 1, Laboratoire de Chimie UMR 5182, F-69342, Lyon, France
| | - Elena Zvereva
- Université de Lorraine and CNRS, LPCT UMR 7019, 54000, Nancy, France
- A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific CentreRussian Academy of Sciences, Arbuzov str. 8, 420088 Kazan, Russia
| | - Marco Marazzi
- Université de Lorraine and CNRS, LPCT UMR 7019, 54000, Nancy, France
| | - Johanna Brazard
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg and Labex NIE, UMR 7504, F-67000 Strasbourg, France
| | - Elise Dumont
- Université de Lyon, École Normale Supérieure de Lyon, CNRS, Université Claude Bernard Lyon 1, Laboratoire de Chimie UMR 5182, F-69342, Lyon, France
| | - Xavier Assfeld
- Université de Lorraine and CNRS, LPCT UMR 7019, 54000, Nancy, France
| | - Stefan Haacke
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg and Labex NIE, UMR 7504, F-67000 Strasbourg, France
| | - Marco Garavelli
- Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
| | - Antonio Monari
- Université de Lorraine and CNRS, LPCT UMR 7019, 54000, Nancy, France
| | - Jérémie Léonard
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg and Labex NIE, UMR 7504, F-67000 Strasbourg, France
| | - Ivan Rivalta
- Université de Lyon, École Normale Supérieure de Lyon, CNRS, Université Claude Bernard Lyon 1, Laboratoire de Chimie UMR 5182, F-69342, Lyon, France
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Oliver TAA. Recent advances in multidimensional ultrafast spectroscopy. ROYAL SOCIETY OPEN SCIENCE 2018; 5:171425. [PMID: 29410844 PMCID: PMC5792921 DOI: 10.1098/rsos.171425] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 12/20/2017] [Indexed: 05/14/2023]
Abstract
Multidimensional ultrafast spectroscopies are one of the premier tools to investigate condensed phase dynamics of biological, chemical and functional nanomaterial systems. As they reach maturity, the variety of frequency domains that can be explored has vastly increased, with experimental techniques capable of correlating excitation and emission frequencies from the terahertz through to the ultraviolet. Some of the most recent innovations also include extreme cross-peak spectroscopies that directly correlate the dynamics of electronic and vibrational states. This review article summarizes the key technological advances that have permitted these recent advances, and the insights gained from new multidimensional spectroscopic probes.
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Affiliation(s)
- Thomas A. A. Oliver
- School of Chemistry, Cantock's Close, University of Bristol, Bristol BS8 1TS, UK
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24
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Schwanen V, Remacle F. Photoinduced Ultrafast Charge Transfer and Charge Migration in Small Gold Clusters Passivated by a Chromophoric Ligand. NANO LETTERS 2017; 17:5672-5681. [PMID: 28805392 DOI: 10.1021/acs.nanolett.7b02568] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Because the development of attopulses, charge migration induced by short optical pulses has been extensively investigated. We report a computational purely electronic dynamical study of ultrafast few femtoseconds (fs) charge transfer and charge migration in realistic passivated stoichiometric Au11 and Au20 gold nanoclusters functionalized by a bipyridine ligand. We show that a net significant amount of electronic charge (0.1 to 0.4 |e| where |e| is the electron charge) is permanently transferred from the bipyridine chromophore to the gold cluster during the short 5-6 fs UV-vis strong pulse. This electron transfer to the metallic core is induced by the optical excitation of electronic states with a partial charge transfer character involving the chromophore before the onset of nuclei motion. In addition, the photoexcitation by the strong fs pulse builds a nonequilibrium electronic density that beats between the chromophore and the metallic core around the average of the transferred value. Modular systems made of a donor chromophore that can be photoexcited in the UV-vis range coupled to an efficient acceptor that could trap the charge are of interest for applications to nanodevices. Our study provides understanding on the very early, purely electronic dynamics built by the fs optical excitation and the initial charge separation step.
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Affiliation(s)
- Valérie Schwanen
- Theoretical Physical Chemistry, UR MOLSYS, University of Liège , B4000 Liège, Belgium
| | - Francoise Remacle
- Theoretical Physical Chemistry, UR MOLSYS, University of Liège , B4000 Liège, Belgium
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25
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Li G, Chen Y, Jiang H, Chen X. Broadband sum-frequency generation using d 33 in periodically poled LiNbO 3 thin film in the telecommunications band. OPTICS LETTERS 2017; 42:939-942. [PMID: 28248336 DOI: 10.1364/ol.42.000939] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We demonstrate the first, to the best of our knowledge, type-0 broadband sum-frequency generation (SFG) based on single-crystal periodically poled LiNbO3 (PPLN) thin film. The broad bandwidth property was largely tuned from mid-infrared region to the telecommunications band by engineering the thickness of PPLN from bulk crystal to nanoscale. It provides SFG a solution with both broadband and high efficiency by using the highest nonlinear coefficient d33 instead of d31 in type-I broadband SFG or second-harmonic generation. The measured 3 dB upconversion bandwidth is about 15.5 nm for a 4 cm long single crystal at 1530 nm wavelength. It can find applications in chip-scale spectroscopy, quantum information processing, LiNbO3-thin-film-based microresonator and optical nonreciprocity devices, etc.
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26
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Borrego-Varillas R, Oriana A, Ganzer L, Trifonov A, Buchvarov I, Manzoni C, Cerullo G. Two-dimensional electronic spectroscopy in the ultraviolet by a birefringent delay line. OPTICS EXPRESS 2016; 24:28491-28499. [PMID: 27958492 DOI: 10.1364/oe.24.028491] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We introduce a 2D electronic spectroscopy setup in the UV spectral range in the partially collinear pump-probe geometry. The required interferometrically phase-locked few-optical-cycle UV pulse pair is generated by combining a passive birefringent interferometer in the visible and nonlinear phase transfer. This is achieved by sum-frequency generation between the phase-locked visible pulse pair and narrowband infrared pulses. We demonstrate a pair of 16-fs, 330-nm pulses whose delay is interferometrically stable with an accuracy better than λ/450. 2DUV maps of pyrene solution probed in the UV and visible spectral ranges are demonstrated.
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27
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Chang HT, Zürch M, Kraus PM, Borja LJ, Neumark DM, Leone SR. Simultaneous generation of sub-5-femtosecond 400 nm and 800 nm pulses for attosecond extreme ultraviolet pump-probe spectroscopy. OPTICS LETTERS 2016; 41:5365-5368. [PMID: 27842133 DOI: 10.1364/ol.41.005365] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Few-cycle laser pulses with wavelengths centered at 400 nm and 800 nm are simultaneously obtained through wavelength separation of ultrashort, spectrally broadened Vis-NIR laser pulses spanning 350-1100 nm wavelengths. The 400 nm and 800 nm pulses are separately compressed, yielding pulses with 4.4 fs and 3.8 fs duration, respectively. The pulse energy exceeds 5 μJ for the 400 nm pulses and 750 μJ for the 800 nm pulses. Intense 400 nm few-cycle pulses have a broad range of applications in nonlinear optical spectroscopy, which include the study of photochemical dynamics, semiconductors, and photovoltaic materials on few-femtosecond to attosecond time scales. The ultrashort 400 nm few-cycle pulses generated here not only extend the spectral range of the optical pulse for NIR-XUV attosecond pump-probe spectroscopy but also pave the way for two-color, three-pulse, multidimensional optical-XUV spectroscopy experiments.
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28
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Gueye M, Nillon J, Crégut O, Léonard J. Broadband UV-Vis vibrational coherence spectrometer based on a hollow fiber compressor. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:093109. [PMID: 27782548 DOI: 10.1063/1.4962699] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We describe a broadband transient absorption (TA) spectrometer devised to excite and probe, in the blue to UV range, vibrational coherence dynamics in organic molecules in condensed phase. A 800-nm Ti:Sa amplifier and a hollow fiber compressor are used to generate a 6-fs short pulse at 1 kHz. Broadband sum frequency generation with the fundamental pulse is implemented to produce a 400-nm, 8-fs Fourier limited short pulse. A UV-Vis white-light supercontinuum is implemented as a probe with intensity self-referencing to achieve a shot-noise-limited sensitivity. Rapid scanning of the pump-probe delay is shown very efficient in suppressing the noise resulting from low-frequency pump intensity fluctuations. Using either of the 800-nm or 400-nm broadband pulses as the pump for TA spectroscopy of organic molecules in solution, we resolve oscillatory signals down to the 320 nm probing wavelength with a 3200 cm-1 FWHM bandwidth. Their Fourier transformation reveals the corresponding molecular vibrational spectra. Finally, we demonstrate the use of this setup as a vibrational coherence spectrometer for the investigation of the vibrational dynamics accompanying the sub-ps C=C photoisomerization of a retinal-like molecular switch through a conical intersection.
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Affiliation(s)
- Moussa Gueye
- Institut de Physique et Chimie des Matériaux de Strasbourg & Labex NIE, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess, Strasbourg 67034, France
| | - Julien Nillon
- Institut de Physique et Chimie des Matériaux de Strasbourg & Labex NIE, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess, Strasbourg 67034, France
| | - Olivier Crégut
- Institut de Physique et Chimie des Matériaux de Strasbourg & Labex NIE, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess, Strasbourg 67034, France
| | - Jérémie Léonard
- Institut de Physique et Chimie des Matériaux de Strasbourg & Labex NIE, Université de Strasbourg, CNRS UMR 7504, 23 rue du Loess, Strasbourg 67034, France
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29
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Kuramochi H, Takeuchi S, Tahara T. Femtosecond time-resolved impulsive stimulated Raman spectroscopy using sub-7-fs pulses: Apparatus and applications. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:043107. [PMID: 27131654 DOI: 10.1063/1.4945259] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Accepted: 03/18/2016] [Indexed: 05/24/2023]
Abstract
We describe details of the setup for time-resolved impulsive stimulated Raman spectroscopy (TR-ISRS). In this method, snapshot molecular vibrational spectra of the photoreaction transients are captured via time-domain Raman probing using ultrashort pulses. Our instrument features transform-limited sub-7-fs pulses to impulsively excite and probe coherent nuclear wavepacket motions, allowing us to observe vibrational fingerprints of transient species from the terahertz to 3000-cm(-1) region with high sensitivity. Key optical components for the best spectroscopic performance are discussed. The TR-ISRS measurements for the excited states of diphenylacetylene in cyclohexane are demonstrated, highlighting the capability of our setup to track femtosecond dynamics of all the Raman-active fundamental molecular vibrations.
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Affiliation(s)
- Hikaru Kuramochi
- Molecular Spectroscopy Laboratory, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan
| | - Satoshi Takeuchi
- Molecular Spectroscopy Laboratory, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan
| | - Tahei Tahara
- Molecular Spectroscopy Laboratory, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan
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30
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Nenov A, Giussani A, Fingerhut BP, Rivalta I, Dumont E, Mukamel S, Garavelli M. Spectral lineshapes in nonlinear electronic spectroscopy. Phys Chem Chem Phys 2016; 17:30925-36. [PMID: 26084213 DOI: 10.1039/c5cp01167a] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We outline a computational approach for nonlinear electronic spectra, which accounts for the electronic energy fluctuations due to nuclear degrees of freedom and explicitly incorporates the fluctuations of higher excited states, induced by the dynamics in the photoactive state(s). This approach is based on mixed quantum-classical dynamics simulations. Tedious averaging over multiple trajectories is avoided by employing the linearly displaced Brownian harmonic oscillator to model the correlation functions. The present strategy couples accurate computations of the high-lying excited state manifold with dynamics simulations. The application is made to the two-dimensional electronic spectra of pyrene, a polycyclic aromatic hydrocarbon characterized by an ultrafast (few tens of femtoseconds) decay from the bright S2 state to the dark S1 state. The spectra for waiting times t2 = 0 and t2 = 1 ps demonstrate the ability of this approach to model electronic state fluctuations and realistic lineshapes. Comparison with experimental spectra [Krebs et al., New Journal of Physics, 2013, 15, 085016] shows excellent agreement and allows us to unambiguously assign the excited state absorption features.
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Affiliation(s)
- Artur Nenov
- Dipartimento di Chimica G. Ciamician, Università di Bologna, V. F. Selmi 2, 40126 Bologna, Italy.
| | - Angelo Giussani
- Dipartimento di Chimica G. Ciamician, Università di Bologna, V. F. Selmi 2, 40126 Bologna, Italy.
| | - Benjamin P Fingerhut
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Strasse 2A, Berlin, 12489, Germany
| | - Ivan Rivalta
- Laboratoire de Chimie, Ecole Normale Suprieure de Lyon, 46, allée d'Italie, 69364 Lyon, France
| | - Elise Dumont
- Laboratoire de Chimie, Ecole Normale Suprieure de Lyon, 46, allée d'Italie, 69364 Lyon, France
| | - Shaul Mukamel
- Department of Chemistry, University of California, Irvine, California 92697-2025, USA
| | - Marco Garavelli
- Dipartimento di Chimica G. Ciamician, Università di Bologna, V. F. Selmi 2, 40126 Bologna, Italy. and Laboratoire de Chimie, Ecole Normale Suprieure de Lyon, 46, allée d'Italie, 69364 Lyon, France
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31
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Nenov A, Segarra-Martí J, Giussani A, Conti I, Rivalta I, Dumont E, Jaiswal VK, Altavilla SF, Mukamel S, Garavelli M. Probing deactivation pathways of DNA nucleobases by two-dimensional electronic spectroscopy: first principles simulations. Faraday Discuss 2015; 177:345-62. [PMID: 25607949 DOI: 10.1039/c4fd00175c] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The SOS//QM/MM [Rivalta et al., Int. J. Quant. Chem., 2014, 114, 85] method consists of an arsenal of computational tools allowing accurate simulation of one-dimensional (1D) and bi-dimensional (2D) electronic spectra of monomeric and dimeric systems with unprecedented details and accuracy. Prominent features like doubly excited local and excimer states, accessible in multi-photon processes, as well as charge-transfer states arise naturally through the fully quantum-mechanical description of the aggregates. In this contribution the SOS//QM/MM approach is extended to simulate time-resolved 2D spectra that can be used to characterize ultrafast excited state relaxation dynamics with atomistic details. We demonstrate how critical structures on the excited state potential energy surface, obtained through state-of-the-art quantum chemical computations, can be used as snapshots of the excited state relaxation dynamics to generate spectral fingerprints for different de-excitation channels. The approach is based on high-level multi-configurational wavefunction methods combined with non-linear response theory and incorporates the effects of the solvent/environment through hybrid quantum mechanics/molecular mechanics (QM/MM) techniques. Specifically, the protocol makes use of the second-order Perturbation Theory (CASPT2) on top of Complete Active Space Self Consistent Field (CASSCF) strategy to compute the high-lying excited states that can be accessed in different 2D experimental setups. As an example, the photophysics of the stacked adenine-adenine dimer in a double-stranded DNA is modeled through 2D near-ultraviolet (NUV) spectroscopy.
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Affiliation(s)
- Artur Nenov
- Dipartimento di Chimica G. Ciamician, Università di Bologna, Via F. Selmi 2, 40126 Bologna, Italy.
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Nenov A, Giussani A, Segarra-Martí J, Jaiswal VK, Rivalta I, Cerullo G, Mukamel S, Garavelli M. Modeling the high-energy electronic state manifold of adenine: Calibration for nonlinear electronic spectroscopy. J Chem Phys 2015; 142:212443. [PMID: 26049463 DOI: 10.1063/1.4921016] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Pump-probe electronic spectroscopy using femtosecond laser pulses has evolved into a standard tool for tracking ultrafast excited state dynamics. Its two-dimensional (2D) counterpart is becoming an increasingly available and promising technique for resolving many of the limitations of pump-probe caused by spectral congestion. The ability to simulate pump-probe and 2D spectra from ab initio computations would allow one to link mechanistic observables like molecular motions and the making/breaking of chemical bonds to experimental observables like excited state lifetimes and quantum yields. From a theoretical standpoint, the characterization of the electronic transitions in the visible (Vis)/ultraviolet (UV), which are excited via the interaction of a molecular system with the incoming pump/probe pulses, translates into the determination of a computationally challenging number of excited states (going over 100) even for small/medium sized systems. A protocol is therefore required to evaluate the fluctuations of spectral properties like transition energies and dipole moments as a function of the computational parameters and to estimate the effect of these fluctuations on the transient spectral appearance. In the present contribution such a protocol is presented within the framework of complete and restricted active space self-consistent field theory and its second-order perturbation theory extensions. The electronic excited states of adenine have been carefully characterized through a previously presented computational recipe [Nenov et al., Comput. Theor. Chem. 1040-1041, 295-303 (2014)]. A wise reduction of the level of theory has then been performed in order to obtain a computationally less demanding approach that is still able to reproduce the characteristic features of the reference data. Foreseeing the potentiality of 2D electronic spectroscopy to track polynucleotide ground and excited state dynamics, and in particular its expected ability to provide conformational dependent fingerprints in dimeric systems, the performances of the selected reduced level of calculations have been tested in the construction of 2D electronic spectra for the in vacuo adenine monomer and the unstacked adenine homodimer, thereby exciting the Lb/La transitions with the pump pulse pair and probing in the Vis to near ultraviolet spectral window.
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Affiliation(s)
- Artur Nenov
- Dipartimento di Chimica "G. Ciamician," Università di Bologna, Via Selmi 2, IT-40126 Bologna, Italy
| | - Angelo Giussani
- Dipartimento di Chimica "G. Ciamician," Università di Bologna, Via Selmi 2, IT-40126 Bologna, Italy
| | - Javier Segarra-Martí
- Dipartimento di Chimica "G. Ciamician," Università di Bologna, Via Selmi 2, IT-40126 Bologna, Italy
| | - Vishal K Jaiswal
- Dipartimento di Chimica "G. Ciamician," Università di Bologna, Via Selmi 2, IT-40126 Bologna, Italy
| | - Ivan Rivalta
- Université de Lyon, CNRS, Institut de Chimie de Lyon, École Normale Supérieure de Lyon, 46 Allée d'Italie, F-69364 Lyon Cedex 07, France
| | - Giulio Cerullo
- Dipartimento di Fisica, Politecnico di Milano, IFN-CNR, Piazza Leonardo Da Vinci 32, IT-20133 Milano, Italy
| | - Shaul Mukamel
- Department of Chemistry, University of California, Irvine, California 92697-2025, USA
| | - Marco Garavelli
- Dipartimento di Chimica "G. Ciamician," Università di Bologna, Via Selmi 2, IT-40126 Bologna, Italy
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