Abstract

We have developed an experimental system for real-time vibrational spectroscopy of molecules in a specific electronic excited state. A synchronized UV light source and a few-cycle visible laser pulse were utilized to prepare and investigate the ultrafast dynamics of molecules in the electronic excited states. A multichannel lock-in amplifier detection system operating in a tandem double lock-in detection mode was used to extract the signal correlated only to the UV and visible pump pulses. Real-time vibrational spectroscopy of chrysene in the triplet state and 1, 3-dihydro-1, 3, 3-trimethyl-6-nitrospiro [2H-1-benzopyran-2, 2-(2H)-indole] in a photochromic state was demonstrated.

© 2011 Optical Society of America

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