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POLARIZED ABSORPTION SPECTRA OF MONOCRYSTALLINE ALL‐ trans . AND 11‐ cis ., 12‐s‐ cis . RETINAL AT 4.2 K
Author(s) -
Drikos G.,
Morys P.,
Rüppel H.
Publication year - 1984
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1984.tb04564.x
Subject(s) - spectral line , retinal , monocrystalline silicon , absorption spectroscopy , chemistry , absorption (acoustics) , crystal (programming language) , helium , liquid helium , atomic physics , physics , optics , silicon , quantum mechanics , organic chemistry , computer science , programming language , biochemistry
Polarized absorption spectra of very thin crystal platelets of all‐ trans . retinal and both forms of 11‐ cis ., 12‐s‐ cis . retinal were measured at liquid Helium temperature. Even at 4.2 K the spectra remain vibronically unresolved. They show, however, a distinct shoulder at 23.9 kK for all‐ trans . and at 22.7 kK for 11‐ cis ., 12‐s‐ cis . retinal on the low energy side of the main band. An assignment of this transition to the lowest‐lying ππ*‐state 1 A g ‐* is proposed.