Femtosecond impulsive excitation of nonstationary vibrational states in bacteriorhodopsin

Optical pulses of 12 fs duration are used to excite and probe nonstationary states in photochemically active protein bacteriorhodopsin. Time-resolved differential transmittance measurement at 568, 620, and 656 nm reveal oscillations from coherent vibrational motion of the retinal chromophore as well...

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Bibliographic Details
Published in:Chemical physics letters 1992-01, Vol.188 (1), p.61-66
Main Authors: Dexheimer, S.L., Wang, Q., Peteanu, L.A., Pollard, W.T., Mathies, R.A., Shank, C.V.
Format: Article
Language:English
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Summary:Optical pulses of 12 fs duration are used to excite and probe nonstationary states in photochemically active protein bacteriorhodopsin. Time-resolved differential transmittance measurement at 568, 620, and 656 nm reveal oscillations from coherent vibrational motion of the retinal chromophore as well as time-dependent changes reflecting its excited state dynamics and subsequent photochemistry. The oscillatory response is dominated by the nonstationary excitation of the ground state reactant, consistent with a resonant impulsive Raman process. Calculations based on this mechanism show good agreement with the results.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(92)85089-S