Observation of 'broad Raman' component in resonant secondary radiation

The broad Raman component in resonant secondary radiation in beta-carotene solution is observed for the first time. The characters obtained are as fol lows: the line shape is independent of excitation energy; the Stokes to ant i-Stokes intensity ratio is n(omega) + 1:n(omega) with a Bose factor n(omeg a); the width at Stokes side is about 150 cm(-1); the integrated intensity decreases toward off-resonant excitation. The broad Raman component has the detailed information on electron-phonon interaction and optical dephasing. (C) 2000 Elsevier Science B.V. All rights reserved.