Far-infrared vibrational spectra of all-trans, 9-cis and 13-cis retinal measured by THz time-domain spectroscopy

Citation
M. Walther et al., Far-infrared vibrational spectra of all-trans, 9-cis and 13-cis retinal measured by THz time-domain spectroscopy, CHEM P LETT, 332(3-4), 2000, pp. 389-395
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CHEMICAL PHYSICS LETTERS
ISSN journal
0009-2614 → ACNP
Volume
332
Issue
3-4
Year of publication
2000
Pages
389 - 395
Database
ISI
SICI code
0009-2614(200012)332:3-4<389:FVSOA9>2.0.ZU;2-B
Abstract
Low-frequency torsional vibration modes of the conjugated polyene chain of the biologically important chromophore retinal are of major relevance when studying its photoisomerization dynamics. We present absorptivity and dispe rsion spectra of three different retinal isomers in the far-infrared region between 10 and 100 cm(-1) (0.3-3.0 THz) measured by terahertz time-domain spectroscopy at 298 and 10 K. At low temperatures the observed broad absorp tion bands resolve into narrow peaks correlating to torsional modes of the molecule. Comparison of the absorption spectra of different retinal isomers enables the approximate localization of the modes within the molecule. Exp erimental linewidths and transition strengths are reported. (C) 2000 Elsevi er Science B.V. All rights reserved.