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Dozova N, Ventelon L, Clermont G, Blanchard-Desce M, Plaza P. Excited-state symmetry breaking of linear quadrupolar chromophores: A transient absorption study. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.10.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Dobryakov AL, Kovalenko SA, Weigel A, Pérez-Lustres JL, Lange J, Müller A, Ernsting NP. Femtosecond pump/supercontinuum-probe spectroscopy: optimized setup and signal analysis for single-shot spectral referencing. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:113106. [PMID: 21133460 DOI: 10.1063/1.3492897] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A setup for pump/supercontinuum-probe spectroscopy is described which (i) is optimized to cancel fluctuations of the probe light by single-shot referencing, and (ii) extends the probe range into the near-uv (1000-270 nm). Reflective optics allow 50 μm spot size in the sample and upon entry into two separate spectrographs. The correlation γ(same) between sample and reference readings of probe light level at every pixel exceeds 0.99, compared to γ(consec)<0.92 reported for consecutive referencing. Statistical analysis provides the confidence interval of the induced optical density, ΔOD. For demonstration we first examine a dye (Hoechst 33258) bound in the minor groove of double-stranded DNA. A weak 1.1 ps spectral oscillation in the fluorescence region, assigned to DNA breathing, is shown to be significant. A second example concerns the weak vibrational structure around t=0 which reflects stimulated Raman processes. With 1% fluctuations of probe power, baseline noise for a transient absorption spectrum becomes 25 μOD rms in 1 s at 1 kHz, allowing to record resonance Raman spectra of flavine adenine dinucleotide in the S(0) and S(1) state.
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Affiliation(s)
- A L Dobryakov
- Department of Chemistry, Humboldt University, Brook-Taylor-Str. 2, D-12489 Berlin, Germany
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Katayama T, Ishibashi Y, Morii Y, Ley C, Brazard J, Lacombat F, Plaza P, Martin MM, Miyasaka H. Ultrafast delocalization of cationic states in poly(N-vinylcarbazole) solid leading to carrier photogeneration. Phys Chem Chem Phys 2010; 12:4560-3. [PMID: 20428534 DOI: 10.1039/b925461g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Femtosecond measurements of the transient dichroism and near-IR time-resolved spectra revealed the ultrafast delocalization of the cationic state in poly(N-vinylcarbazole), leading to carrier photogeneration.
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Affiliation(s)
- Tetsuro Katayama
- Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University and CREST, JST Toyonaka, 560-8531, Osaka, Japan
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Ley C, Lacombat F, Plaza P, Martin MM, Leray I, Valeur B. Femtosecond to Subnanosecond Multistep Calcium Photoejection from a Crown Ether-Linked Merocyanine. Chemphyschem 2009; 10:276-81. [DOI: 10.1002/cphc.200800612] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Brazard J, Ley C, Lacombat F, Plaza P, Martin MM, Checcucci G, Lenci F. Primary Photoprocesses Involved in the Sensory Protein for the Photophobic Response of Blepharisma japonicum. J Phys Chem B 2008; 112:15182-94. [DOI: 10.1021/jp805815e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Johanna Brazard
- UMR 8640 CNRS-ENS-UPMC, Département de Chimie, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France, and Istituto di Biofisica del CNR, Via G. Moruzzi 1, 56100 Pisa, Italy
| | - Christian Ley
- UMR 8640 CNRS-ENS-UPMC, Département de Chimie, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France, and Istituto di Biofisica del CNR, Via G. Moruzzi 1, 56100 Pisa, Italy
| | - Fabien Lacombat
- UMR 8640 CNRS-ENS-UPMC, Département de Chimie, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France, and Istituto di Biofisica del CNR, Via G. Moruzzi 1, 56100 Pisa, Italy
| | - Pascal Plaza
- UMR 8640 CNRS-ENS-UPMC, Département de Chimie, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France, and Istituto di Biofisica del CNR, Via G. Moruzzi 1, 56100 Pisa, Italy
| | - Monique M. Martin
- UMR 8640 CNRS-ENS-UPMC, Département de Chimie, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France, and Istituto di Biofisica del CNR, Via G. Moruzzi 1, 56100 Pisa, Italy
| | - Giovanni Checcucci
- UMR 8640 CNRS-ENS-UPMC, Département de Chimie, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France, and Istituto di Biofisica del CNR, Via G. Moruzzi 1, 56100 Pisa, Italy
| | - Francesco Lenci
- UMR 8640 CNRS-ENS-UPMC, Département de Chimie, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France, and Istituto di Biofisica del CNR, Via G. Moruzzi 1, 56100 Pisa, Italy
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