Influencing parameters in time resolved picosecond spectroscopy and a new light gate method

Abstract

We show that the open period of a CS 2 light gate, triggered by a picosecond optical pulse, depends on the optical pathlength through the CS 2. An alternative to the light gate is suggested for time resolved spectroscopy. The working principle is based on scattering induced in CS 2. We have found that the broadband emission from H 2O or D 2O excited by a 5300 Å picosecond pulse is also of picosecond duration, but the blue part is delayed with respect to the red. From this delay time the lifetime of the ground state vibrational levels may be measured directly.