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Proceedings Paper

Structure And Dynamics Of Molecular Clusters Via High Resolution IR Absorption Spectroscopy
Author(s): David J. Nesbitt
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Paper Abstract

The combination of high resolution (<10-3 cm-1) cw tunable difference frequency generation (2.2-4.2 μm) with high sensitivity (10-6/√Hz) long path length absorption methods in pulsed slit supersonic jets has permitted spectroscopic investigation of many weakly bound molecular complexes. Discussion will focus on three complementary areas of experimentation. 1) Cluster formation in the molecular beam is probed via sub-Doppler, velocity resolved absorption profiles of monomer species. Spatially dependent beam clustering is strongly manifested through loss of monomer absorption intensity at line center. 2) IR spectra of simple van der Waals molecules such as ArHF are obtained in the υ1 HF stretching region. Information on all modes in the complex is extracted. 3) IR spectra of hydrogen bonded complexes such as HFCO2 are observed which exhibit large changes in average molecular geometry as a function of vibrational state. Surprisingly low intermolecular bending frequencies are evidenced in the spectra via hot bands, and provide dynamical information on coupled vibrational-rotational motion in floppy molecular systems.

Paper Details

Date Published: 1 January 1987
PDF: 5 pages
Proc. SPIE 0742, Laser Applications to Chemical Dynamics, (1 January 1987); doi: 10.1117/12.966898
Show Author Affiliations
David J. Nesbitt, University of Colorado (United States)

Published in SPIE Proceedings Vol. 0742:
Laser Applications to Chemical Dynamics
Mostafa A. El-Sayed, Editor(s)

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