標題: Ultrafast spectroscopy with sub-10 fs deep-ultraviolet pulses
作者: Kobayashi, Takayoshi
Kida, Yuichiro
電子物理學系
Department of Electrophysics
公開日期: 2012
摘要: 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.
URI: http://hdl.handle.net/11536/16184
ISSN: 1463-9076
期刊: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume: 14
Issue: 18
結束頁: 6200
顯示於類別:期刊論文


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  1. 000302951500008.pdf