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Issue 18, 2012

Ultrafast spectroscopy with sub-10 fs deep-ultraviolet pulses

Author affiliations

Abstract

Time-resolved transient absorption spectroscopy with sub-9 fs ultrashort laser pulses in the deep-ultraviolet (DUV) region is reported for the first time. Single 8.7 fs DUV pulses with a spectral range of 255–290 nm are generated by a chirped-pulse four-wave mixing technique for use as pump and probe pulses. Electronic excited state and vibrational dynamics are simultaneously observed for an aqueous solution of thymine over the full spectral range using a 128-channel lock-in detector. Vibrational modes of the electronic ground state and excited states can be observed as well as the decay dynamics of the electronic excited state. Information on the initial phase of the vibrational modes is extracted from the measured difference absorbance trace, which contains oscillatory structures arising from the vibrational modes of the molecule. Along with other techniques such as time-resolved infrared spectroscopy, spectroscopy with sub-9 fs DUV pulses is expected to contribute to a detailed understanding of the photochemical dynamics of biologically significant molecules that absorb in the DUV region such as DNA and amino acids.

Graphical abstract: Ultrafast spectroscopy with sub-10 fs deep-ultraviolet pulses

Article information


Submitted
19 Nov 2011
Accepted
07 Feb 2012
First published
07 Feb 2012

Phys. Chem. Chem. Phys., 2012,14, 6200-6210
Article type
Paper

Ultrafast spectroscopy with sub-10 fs deep-ultraviolet pulses

T. Kobayashi and Y. Kida, Phys. Chem. Chem. Phys., 2012, 14, 6200 DOI: 10.1039/C2CP23649D

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