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Mikhailov I, Baturin A, Kondratenko V, Kopilets I, Mikhailov A. Prospects for application of X-ray anomalous transmission effect to monochromatization of broadband spectrum. JOURNAL OF X-RAY SCIENCE AND TECHNOLOGY 2017; 25:25-32. [PMID: 27662277 DOI: 10.3233/xst-160605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The characteristics of spectra obtained by monochromatization of a broadband spectrum using the effect of X-ray anomalous transmission (Bormann effect) have been experimentally studied. Optimization of the crystal thickness allows one to obtain the spectral band with a controlled width of ΔE/E = 1-5 10-3 and with a contrast of more than 250 with a peak reflectivity not less than 4% in the transmitted Bormann beam. It was found that due to the wave field compression, the width of the transmitted Bormann beam decreased three times as the thickness of the crystal increased. The value of parallel displacement of the transmitted Bormann beam relative to the primary one, which depends on crystal thickness, was measured. This value was shown to be sufficient for the beams to be separated by the slit. Monitoring the transmitted Bormann beam by the shape of 2d-curves of the diffracted Laue-beam enables the precise control of characteristics of the primary source with a complex shape of angle and energy distributions of photons.
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Quan R, Zhai Y, Wang M, Hou F, Wang S, Xiang X, Liu T, Zhang S, Dong R. Demonstration of quantum synchronization based on second-order quantum coherence of entangled photons. Sci Rep 2016; 6:30453. [PMID: 27452276 PMCID: PMC4958996 DOI: 10.1038/srep30453] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 07/04/2016] [Indexed: 11/09/2022] Open
Abstract
Based on the second-order quantum interference between frequency entangled photons that are generated by parametric down conversion, a quantum strategic algorithm for synchronizing two spatially separated clocks has been recently presented. In the reference frame of a Hong-Ou-Mandel (HOM) interferometer, photon correlations are used to define simultaneous events. Once the HOM interferometer is balanced by use of an adjustable optical delay in one arm, arrival times of simulta- neously generated photons are recorded by each clock. The clock offset is determined by correlation measurement of the recorded arrival times. Utilizing this algorithm, we demonstrate a proof-of-principle experiment for synchronizing two clocks separated by 4 km fiber link. A minimum timing stability of 0.44 ps at averaging time of 16000 s is achieved with an absolute time accuracy of 73.2 ps. The timing stability is verified to be limited by the correlation measurement device and ideally can be better than 10 fs. Such results shine a light to the application of quantum clock synchronization in the real high-accuracy timing system.
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Affiliation(s)
- Runai Quan
- Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an, 710600, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yiwei Zhai
- Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an, 710600, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Mengmeng Wang
- Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an, 710600, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Feiyan Hou
- Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an, 710600, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shaofeng Wang
- Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an, 710600, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiao Xiang
- Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an, 710600, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Tao Liu
- Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an, 710600, China
| | - Shougang Zhang
- Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an, 710600, China
| | - Ruifang Dong
- Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an, 710600, China
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3
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Bhattacherjee A, Attar AR, Leone SR. Transition state region in the A-Band photodissociation of allyl iodide—A femtosecond extreme ultraviolet transient absorption study. J Chem Phys 2016; 144:124311. [DOI: 10.1063/1.4944930] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Aditi Bhattacherjee
- Department of Chemistry, University of California, Berkeley, California 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Andrew R. Attar
- Department of Chemistry, University of California, Berkeley, California 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Stephen R. Leone
- Department of Chemistry, University of California, Berkeley, California 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- Department of Physics, University of California, Berkeley, California 94720, USA
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Park J, Zhang Q, Chen P, Cosgriff MP, Tilka JA, Adamo C, Schlom DG, Wen H, Zhu Y, Evans PG. Spatially confined low-power optically pumped ultrafast synchrotron x-ray nanodiffraction. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2015; 86:083904. [PMID: 26329208 DOI: 10.1063/1.4929436] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The combination of ultrafast optical excitation and time-resolved synchrotron x-ray nanodiffraction provides unique insight into the photoinduced dynamics of materials, with the spatial resolution required to probe individual nanostructures or small volumes within heterogeneous materials. Optically excited x-ray nanobeam experiments are challenging because the high total optical power required for experimentally relevant optical fluences leads to mechanical instability due to heating. For a given fluence, tightly focusing the optical excitation reduces the average optical power by more than three orders of magnitude and thus ensures sufficient thermal stability for x-ray nanobeam studies. Delivering optical pulses via a scannable fiber-coupled optical objective provides a well-defined excitation geometry during rotation and translation of the sample and allows the selective excitation of isolated areas within the sample. Experimental studies of the photoinduced lattice dynamics of a 35 nm BiFeO3 thin film on a SrTiO3 substrate demonstrate the potential to excite and probe nanoscale volumes.
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Affiliation(s)
- Joonkyu Park
- Department of Materials Science and Engineering and Materials Science Program, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Qingteng Zhang
- Department of Materials Science and Engineering and Materials Science Program, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Pice Chen
- Department of Materials Science and Engineering and Materials Science Program, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Margaret P Cosgriff
- Department of Materials Science and Engineering and Materials Science Program, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Jack A Tilka
- Department of Materials Science and Engineering and Materials Science Program, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Carolina Adamo
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
| | - Darrell G Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
| | - Haidan Wen
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Yi Zhu
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Paul G Evans
- Department of Materials Science and Engineering and Materials Science Program, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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Loether A, Gao Y, Chen Z, DeCamp MF, Dufresne EM, Walko DA, Wen H. Transient crystalline superlattice generated by a photoacoustic transducer. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2014; 1:024301. [PMID: 26798773 PMCID: PMC4711598 DOI: 10.1063/1.4867494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Accepted: 02/18/2014] [Indexed: 05/22/2023]
Abstract
Designing an efficient and simple method for modulating the intensity of x-ray radiation on a picosecond time-scale has the potential to produce ultrafast pulses of hard x-rays. In this work, we generate a tunable transient superlattice, in an otherwise perfect crystal, by photoexciting a metal film on a crystalline substrate. The resulting transient strain has amplitudes approaching 1%, wavevectors greater than [Formula: see text], and lifetimes approaching 1 ns. This method has the potential to generate isolated picosecond x-ray bursts with scattering efficiencies in excess of 10%.
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Affiliation(s)
- A Loether
- Department of Physics and Astronomy, University of Delaware , Newark, Delaware 19716, USA
| | | | - Z Chen
- Department of Physics and Astronomy, University of Delaware , Newark, Delaware 19716, USA
| | - M F DeCamp
- Department of Physics and Astronomy, University of Delaware , Newark, Delaware 19716, USA
| | - E M Dufresne
- Argonne National Laboratory , Argonne, Illinois 60439, USA
| | - D A Walko
- Argonne National Laboratory , Argonne, Illinois 60439, USA
| | - H Wen
- Argonne National Laboratory , Argonne, Illinois 60439, USA
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6
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Chen Z, Minch BC, DeCamp MF. High wavevector optical phonons in microstructured Bismuth films. OPTICS EXPRESS 2010; 18:4365-4370. [PMID: 20389448 DOI: 10.1364/oe.18.004365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report the generation of high wavevector, large amplitude coherent optical phonons in a microstructured Bismuth film. A femtosecond laser pulse optically excites a periodic micron scale grating etched into a Bismuth film. The ultrafast excitation produced coherent optical phonon oscillations with wavevectors as large as 1 microm(-1), providing a possible method of generating an efficient sub-picosecond switch for hard x-rays.
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Affiliation(s)
- Zhiyuan Chen
- Department of Physics and Astronomy, University of Delaware Newark, DE 19716, USA
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7
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Park H, Nie S, Wang X, Clinite R, Cao J. Optical control of coherent lattice motions probed by femtosecond electron diffraction. J Phys Chem B 2007; 109:13854-6. [PMID: 16852738 DOI: 10.1021/jp052857u] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the study of laser-induced coherent lattice motions using femtosecond electron diffraction. The oscillations of Bragg peak positions associated with a damped lattice vibration along the surface normal were directly observed in real time and with sub-milli-angstrom spatial resolution. In addition, by using a pair of optical excitation pulses and varying their time delay and relative pulse intensities, we demonstrated the successful control of coherent lattice motions.
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Foreman SM, Holman KW, Hudson DD, Jones DJ, Ye J. Remote transfer of ultrastable frequency references via fiber networks. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2007; 78:021101. [PMID: 17578096 DOI: 10.1063/1.2437069] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Three distinct techniques exist for distributing an ultrastable frequency reference over optical fibers. For the distribution of a microwave frequency reference, an amplitude-modulated continuous wave (cw) laser can be used. Over kilometer-scale lengths this approach provides an instability at 1 s of approximately 3 x 10(-14) without stabilization of the fiber-induced noise and approximately 1 x 10(-14) with active noise cancellation. An optical frequency reference can be transferred by directly transmitting a stabilized cw laser over fiber and then disseminated to other optical and microwave regions using an optical frequency comb. This provides an instability at 1 s of 2 x 10(-14) without active noise cancellation and 3 x 10(-15) with active noise cancellation [Recent results reduce the instability at 1 s to 6 x 10(-18).] Finally, microwave and optical frequency references can be simultaneously transmitted using an optical frequency comb, and we expect the optical transfer to be similar in performance to the cw optical frequency transfer. The instability at 1 s for transfer of a microwave frequency reference with the comb is approximately 3 x 10(-14) without active noise cancellation and <7 x 10(-15) with active stabilization. The comb can also distribute a microwave frequency reference with root-mean-square timing jitter below 16 fs integrated over the Nyquist bandwidth of the pulse train (approximately 50 MHz) when high-bandwidth active noise cancellation is employed, which is important for remote synchronization applications.
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Affiliation(s)
- Seth M Foreman
- JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309, USA.
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9
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Bargheer M, Zhavoronkov N, Woerner M, Elsaesser T. Recent Progress in Ultrafast X-ray Diffraction. Chemphyschem 2006; 7:783-92. [PMID: 16596604 DOI: 10.1002/cphc.200500591] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
X-ray diffraction with femtosecond time-resolution represents a direct probe of ultrafast structural changes in condensed matter. The generation of ultrashort X-ray pulses in laser-driven plasma and/or accelerator-based sources has made substantial progress, and has allowed for studies of transient structures with an unprecedented accuracy. Herein, recent work on transient crystalline structures is reviewed, with the focus on laser-based experiments.
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Affiliation(s)
- M Bargheer
- Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, 12489 Berlin, Germany.
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Chen LX. PROBING TRANSIENT MOLECULAR STRUCTURES IN PHOTOCHEMICAL PROCESSES USING LASER-INITIATED TIME-RESOLVED X-RAY ABSORPTION SPECTROSCOPY. Annu Rev Phys Chem 2005; 56:221-54. [PMID: 15796701 DOI: 10.1146/annurev.physchem.56.092503.141310] [Citation(s) in RCA: 155] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Molecular structures during chemical processes are crucial for predicting molecular reactivity and reaction mechanisms. Using a laser pulse as an internal clock for starting fundamental chemical processes, molecular structural dynamics can be characterized by coherent vibrational motions and by incoherent transitions between different intermediate states. Recent developments in pulsed X-ray facilities allow structural determination of discrete excited states and reaction intermediates using laser-initiated time-resolved X-ray absorption spectroscopy (LITR-XAS). Moreover, femtosecond X-ray sources have begun making significant contributions in monitoring coherent molecular motions. This review summarizes recent developments in the field, including technical and scientific challenges as well as several examples involving excited state molecular structure and electronic configuration determinations. Future applications of this technique with high time resolution will enable visualization of fundamental chemical events in many systems and further our understanding in photochemistry.
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Affiliation(s)
- Lin X Chen
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
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11
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Bargheer M, Zhavoronkov N, Gritsai Y, Woo JC, Kim DS, Woerner M, Elsaesser T. Coherent Atomic Motions in a Nanostructure Studied by Femtosecond X-ray Diffraction. Science 2004; 306:1771-3. [PMID: 15576618 DOI: 10.1126/science.1104739] [Citation(s) in RCA: 102] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Reversible structural changes of a nanostructure were measured nondestructively with subpicometer spatial and subpicosecond temporal resolution via x-ray diffraction (XRD). The spatially periodic femtosecond excitation of a gallium arsenide/aluminum gallium arsenide superlattice results in coherent lattice motions with a 3.5-picosecond period, which was directly monitored by femtosecond x-ray pulses at a 1-kilohertz repetition rate. Small changes (DeltaR/R = 0.01) of weak Bragg reflexes (R = 0.005) were detected. The phase and amplitude of the oscillatory XRD signal around a new equilibrium demonstrate that displacive excitation of the zone-folded acoustic phonons is the dominant mechanism for strong excitation.
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Affiliation(s)
- M Bargheer
- Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, 12489 Berlin, Germany
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12
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Nazarkin A, Uschmann I, Förster E, Sauerbrey R. High-order Raman scattering of X rays by optical phonons and generation of ultrafast X-ray transients. PHYSICAL REVIEW LETTERS 2004; 93:207401. [PMID: 15600967 DOI: 10.1103/physrevlett.93.207401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2003] [Revised: 06/07/2004] [Indexed: 05/24/2023]
Abstract
We study the modulation of x-ray diffraction in ideal crystals by a copropagating wave of optical vibrations generated by a fs-laser pulse. Our results suggest that in the synchronous interaction regime the output diffracted x-ray field has the form of ultrafast transients with a time structure even shorter than the period of the excited vibrational mode. The behavior is explained in terms of high-order Raman scattering of x rays by optical phonons.
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Affiliation(s)
- A Nazarkin
- Friedrich-Schiller-Universität, Institut für Optik und Quantenelektronik, Max-Wien-Platz 1, D-07743 Jena, Germany
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15
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DeCamp MF, Reis DA, Cavalieri A, Bucksbaum PH, Clarke R, Merlin R, Dufresne EM, Arms DA, Lindenberg AM, MacPhee AG, Chang Z, Lings B, Wark JS, Fahy S. Transient strain driven by a dense electron-hole plasma. PHYSICAL REVIEW LETTERS 2003; 91:165502. [PMID: 14611411 DOI: 10.1103/physrevlett.91.165502] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2002] [Indexed: 05/06/2023]
Abstract
We measure transient strain in ultrafast laser-excited Ge by time-resolved x-ray anomalous transmission. The development of the coherent strain pulse is dominated by rapid ambipolar diffusion. This pulse extends considerably longer than the laser penetration depth because the plasma initially propagates faster than the acoustic modes. X-ray diffraction simulations are in agreement with the observed dynamics.
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Affiliation(s)
- M F DeCamp
- FOCUS Center and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
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Chen LX, Shaw GB, Novozhilova I, Liu T, Jennings G, Attenkofer K, Meyer GJ, Coppens P. MLCT state structure and dynamics of a copper(I) diimine complex characterized by pump-probe X-ray and laser spectroscopies and DFT calculations. J Am Chem Soc 2003; 125:7022-34. [PMID: 12783557 DOI: 10.1021/ja0294663] [Citation(s) in RCA: 218] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The molecular structure and dynamics of the photoexcited metal-to-ligand-charge-transfer (MLCT) state of [Cu(I)(dmp)(2)](+), where dmp is 2,9-dimethyl-1,10-phenanthroline, in acetonitrile have been investigated by time-domain pump-probe X-ray absorption spectroscopy, femtosecond optical transient spectroscopy, and density functional theory (DFT). The time resolution for the excited state structural determination was 100 ps, provided by single X-ray pulses from a third generation synchrotron source. The copper ion in the thermally equilibrated MLCT state has the same oxidation state as the corresponding copper(II) complex in the ground state and was found to be penta-coordinate with an average nearest neighbor Cu-N distance 0.04 A shorter than that of the ground state [Cu(I)(dmp)(2)](+). The results confirm the previously proposed "exciplex" structure of the MLCT state in Lewis basic solvents. The evolution from the photoexcited Franck-Condon MLCT state to the thermally equilibrated MLCT state was followed by femtosecond optical transient spectroscopy, revealing three time constants of 500-700 fs, 10-20 ps, and 1.6-1.7 ns, likely related to the kinetics for the formation of the triplet MLCT state, structural relaxation, and the MLCT excited-state decay to the ground state, respectively. DFT calculations are used to interpret the spectral shift on structural relaxation and to predict the geometries of the ground state, the tetracoordinate excited state, and the exciplex. The DFT calculations also indicate that the amount of charge transferred from copper to the dmp ligand upon photoexcitation is similar to the charge difference at the copper center between the ground-state copper(I) and copper(II) complexes.
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Affiliation(s)
- Lin X Chen
- Chemistry Division and Material Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
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17
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Siders CW, Cavalleri A. Materials science. Creating transient crystal structures with light. Science 2003; 300:591-2. [PMID: 12714730 DOI: 10.1126/science.1084470] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Craig W Siders
- School of Optics/CREOL and the Florida Photonics Center of Excellence, University of Central Florida, Orlando, FL 32816, USA.
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Muskens OL, Dijkhuis JI. High amplitude, ultrashort, longitudinal strain solitons in sapphire. PHYSICAL REVIEW LETTERS 2002; 89:285504. [PMID: 12513158 DOI: 10.1103/physrevlett.89.285504] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2002] [Indexed: 05/24/2023]
Abstract
We demonstrate the development of high-amplitude picosecond strain pulses in a sapphire single crystal into an ultrafast compressional soliton train. For this purpose, large-intensity light pulses were used to excite a metal film, yielding a 2 orders of magnitude higher strain than that achieved in earlier studies. Propagation of the packets is monitored over a distance of several millimeters by means of Brillouin light scattering. A one-parameter model, based on the Korteweg-de Vries-Burgers equation, simultaneously explains the observed behavior at all strains and temperatures under study. We predict up to 11 solitons in the train, reaching pressures as high as 40 kbar and 0.5 ps temporal widths.
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Affiliation(s)
- Otto L Muskens
- Atom Optics and Ultrafast Dynamics, Debye Institute, Faculty of Physics and Astronomy, University of Utrecht, P.O. Box 80 000, 3508 TA, Utrecht, The Netherlands.
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Yabashi M, Tamasaku K, Ishikawa T. Measurement of x-ray pulse widths by intensity interferometry. PHYSICAL REVIEW LETTERS 2002; 88:244801. [PMID: 12059306 DOI: 10.1103/physrevlett.88.244801] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2002] [Indexed: 05/23/2023]
Abstract
The pulse width of hard undulator radiation (32 ps width, energy 14 keV) was determined by intensity interferometry. The method, in combination with various x-ray monochromators, enables measurements to be taken over a wide range of time frames, from ns to fs. The applicable target includes measurements of ultrafast x-ray pulse widths from fourth generation synchrotron light sources.
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Affiliation(s)
- M Yabashi
- SPring-8/JASRI, Mikazuki, Hyogo 679-5198, Japan
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20
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Lindenberg AM, Kang I, Johnson SL, Falcone RW, Heimann PA, Chang Z, Lee RW, Wark JS. Coherent control of phonons probed by time-resolved x-ray diffraction. OPTICS LETTERS 2002; 27:869-871. [PMID: 18007955 DOI: 10.1364/ol.27.000869] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Time-resolved x-ray diffraction with picosecond temporal resolution is used to probe the product state of a coherent control experiment in which a single acoustic mode in a bulk semiconductor is driven to large amplitude or canceled out. It is demonstrated that by shaping ultrafast acoustic pulses one can coherently control the x-ray diffraction efficiency of a crystal on the time scale of a vibrational period, with application to coherent switching of x-ray beams.
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Cavalleri A, Tóth C, Siders CW, Squier JA, Ráksi F, Forget P, Kieffer JC. Femtosecond Structural Dynamics in VO2 during an Ultrafast Solid-Solid Phase Transition. PHYSICAL REVIEW LETTERS 2001; 87:237401. [PMID: 11736474 DOI: 10.1103/physrevlett.87.237401] [Citation(s) in RCA: 312] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2001] [Indexed: 05/21/2023]
Abstract
Femtosecond x-ray and visible pulses were used to probe structural and electronic dynamics during an optically driven, solid-solid phase transition in VO(2). For high interband electronic excitation (approximately 5 x 10(21) cm(-3)), a subpicosecond transformation into the high-T, rutile phase of the material is observed, simultaneous with an insulator-to-metal transition. The fast time scale observed suggests that, in this regime, the structural transition may not be thermally initiated.
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Affiliation(s)
- A Cavalleri
- University of California San Diego, La Jolla, California 92093-0339, USA.
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Krausz F, Spielmann C. Molecular dynamics. Slick switching of X-rays. Nature 2001; 413:784-5, 787. [PMID: 11677586 DOI: 10.1038/35101677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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