Vibrationally resolved photoabsorption spectroscopy of red fluorescent protein chromophore anions -: art. no. 118103

被引:31
作者
Boyé, S
Krogh, H
Nielsen, IB
Nielsen, SB
Pedersen, SU
Pedersen, UV
Andersen, LH
Bell, AF
He, X
Tonge, PJ
机构
[1] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark
[2] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA
[3] Aarhus Univ, Inst Storage Ring Facil, DK-8000 Aarhus C, Denmark
关键词
D O I
10.1103/PhysRevLett.90.118103
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Photoabsorption studies of red fluorescent protein chromophore anions have been performed at the ELISA electrostatic heavy-ion storage ring. The broad absorption band due to electronic excitation of the chromophores is tuned to a longer wavelength (redshifted) by extending the electronic conjugation of the molecule. A clear vibrational progression is resolved with E(vib)similar to380 and 520 cm(-1) for two different forms of the chromophore. The vibrational modes correspond to collective motions of the entire molecular structure. It is argued that the excited electronic state has an equilibrium configuration far from that of the electronic ground state, i.e., poor Franck Condon overlap.
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