Journal
CHEMICAL PHYSICS
Volume 422, Issue -, Pages 47-52Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2013.01.036
Keywords
Ultraviolet; Ultrafast; Transient absorption; Photon echo; Transient grating; Tryptophan
Funding
- NCCR-MUST of the Swiss National Science Foundation (FNS)
- [200020_121839]
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We compare UV transient grating (TG) experiments of aqueous tryptophan with transient absorption (TA) and fluorescence up-conversion measurements. The TG and TA signals show a bi-exponential rise with sub-ps and ps time constants, which are consistent with the fluorescence studies. Using experimental data, we provide an equation for the homodyne-detected TG signal, taking into account the sub-100 fs internal conversion of tryptophan after excitation. In addition, we measure a sub-100 fs homogeneous electronic dephasing time for tryptophan in water by the photon echo (PE) technique. These measurements provide a consistent picture of excited state dynamics of aqueous tryptophan that may serve as a basis for coherent 2D-UV spectroscopy of biosystems. (C) 2013 Elsevier B. V. All rights reserved.
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