Berlin 2001 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 17: Poster: Spectroscopy and Single Particle Spectroscopy of Molecular Systems, Photoprocesses, Biological Systems

CPP 17.3: Poster

Tuesday, April 3, 2001, 12:30–15:00, AT1

Spin-conversion of methyl groups observed by UV holeburning in p-chlorotoluene — •Martin Pinsker and Josef Friedrich — Lehrstuhl für Physik Weihenstephan, TU München, Vöttinger Straße 40, 85350 Freising, Germany

We performed holeburning experiments in the UV with p-chlorotoluene as a probe in a cyclohexane matrix. The holeburning mechanism is exclusively based on a light-induced change of the total nuclear spin of the methyl group. By measuring the recovery of the hole as a function of temperature we were able to observe nuclear spin conversion relaxation between 3 and 8 K. It is governed by a Raman process. The associated lattice temperature is about 38 K.