Bain, AJ;
Chandna, P;
Bryant, J;
(2000)
Picosecond polarized fluorescence studies of anisotropic fluid media. I. Theory.
The Journal of Chemical Physics
, 112
(23)
10418 - 10434.
10.1063/1.481678.
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Abstract
Recent work has demonstrated the production of substantial molecular alignment in a free ethylene glycol jet. Using variably polarized photoselection, a range of initial nonequilibrium orientational distributions can be prepared and their subsequent relaxation monitored via polarization resolved time correlated single photon counting. The imposition of order in a fluid is seen to have a profound effect on molecular motion and a strong anisotropy in theta and phi diffusion is indicated. In this work (Papers I and II) we describe a detailed investigation of this phenomenon. Here (Paper I) we develop the formalism necessary to describe the interaction of polarized laser pulses with an anisotropic medium, allowing a full description of the initially photoselected distribution. The relaxation of the nonequilibrium distributions is considered via a perturbation treatment of the anisotropic rotational diffusion equation. New "selection rules" for orientational relaxation can be deduced from symmetry arguments and the form of the cylindrically symmetric (theta diffusion) and asymmetric alignment decays (phi diffusion) are predicted. (C) 2000 American Institute of Physics. [S0021-9606(00)00117-3].
| Type: | Article |
|---|---|
| Title: | Picosecond polarized fluorescence studies of anisotropic fluid media. I. Theory |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/1.481678 |
| Publisher version: | https://doi.org/10.1063/1.481678 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | LASER TECHNIQUES, LIQUID-CRYSTALS, ROTATIONAL DIFFUSION, DEPOLARIZATION, ORDER, COLLISIONS, MEMBRANES, EMISSION, DECAY |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/113001 |
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