標題: Fs photo-isomerization in bacteriorhodopsin by few-cycle pulses
作者: Kobayashi, Takayoshi
Yabushita, Atsushi
電子物理學系
Department of Electrophysics
關鍵字: ultrafast;real-time spectroscopy;pump-probe spectroscopy;difference absorption spectrum
公開日期: 1-May-2008
摘要: We have build up non-collinear optical parametric amplifier (NOPA) laser system with adaptive pulse tailoring, which enables to generate sub-4-fs laser pulses. Using the ultrashort laser pulses generated by NOPA, we have performed pump-probe measurement of bacteriorhodopsin (bR) using ultrashort pulses, which can observe real-time frequencies of molecular vibrations. Both of the spectra of pump and probe pulses are nearly the same and cover a spectral range from 500 to 710 nm with a nearly constant phase. The time-gated Fourier transform of the measured absorbance change trace revealed that the frequency of the C = C stretching mode was modulated along with the torsion motion around C-13=C-14 during the photoisomerization of bR. It shows the bond length Of C13=C14 is modulated on the deformation around C-13=C-14 during the photoisomerization. The hydrogen-out-of-plane (HOOP) mode and the in-plane C = C-H bending mode coupled with C-C stretching mode are found to be intermixed with each other in the same period of the torsion motion. It also shows us the real-time conformation change of the molecule, which makes both of the modes indistinguishable. (C) 2007 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jlumin.2007.11.051
http://hdl.handle.net/11536/29543
ISSN: 0022-2313
DOI: 10.1016/j.jlumin.2007.11.051
期刊: JOURNAL OF LUMINESCENCE
Volume: 128
Issue: 5-6
起始頁: 1038
結束頁: 1042
Appears in Collections:Conferences Paper


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