Abstract
Femtosecond spectroscopy enables to follow in real time, in molecules and solids, vibrational motions coupled to the electronic transition; the availability of light pulses with duration of just a few optical cycles allows to access modes with frequencies up to 2000 cm-1. Time-domain vibrational spectroscopy is complementary to frequency-domain Raman spectroscopy, providing information also on nuclear dynamics in the excited state and on the shape of the potential energy surfaces. There have been only few reports of observation of coherent vibrational dynamics in biomolecules, such as proteins [1-3]; studies under normal operating conditions, i.e. at room temperature and in physiological solution, are challenging because of the fast dephasing times.
© 2002 Optical Society of America
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