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| Journal Article | PreJuSER-20193 |
; ; ; ; ; ;
2011
Soc.
Washington, DC
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Please use a persistent id in citations: doi:10.1021/jp110597a
Abstract: Femtosecond IR-pump-IR-probe experiments with independently tunable pulses are used to monitor the ultrafast response of selected IR absorption bands to vibrational excitation of other modes of Fmoc-nitrophenylalanine. The absorptions of both NO(2)-bands change rapidly within <2 ps upon excitation of other vibrational modes. The results point to considerable coupling between the monitored NO(2) modes and the initially excited modes or low-frequency modes. The latter are populated by a rapid energy redistribution process. The strong IR absorption of the NO(2) stretching bands and the intense coupling to other modes makes the nitro group of nitrophenylalanine a sensitive monitor for vibrational energy arriving at this amino acid.
Keyword(s): Energy Transfer (MeSH) ; Hot Temperature (MeSH) ; Peptides: chemistry (MeSH) ; Phenylalanine: analogs & derivatives (MeSH) ; Spectrophotometry, Infrared: instrumentation (MeSH) ; Vibration (MeSH) ; Health and Life (1st) ; Health and Life (1st) ; Biology (2nd) ; Peptides ; 4-nitrophenylalanine ; Phenylalanine ; J
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