CARS SPECTRA OF COLD H${_2}$ CLUSTERS
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Date
2007
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Neat H${_2}$ clusters as well as H${_2}$ clusters embedded in helium droplets have been obtained in a pulsed cryogenic nozzle beam expansion and studied via Coherent anti-Stokes Raman Scattering (CARS) technique. The motivation for these experiments is to spectroscopically observe superfluidity in molecular hydrogen clusters. Results on large hydrogen clusters of about 10$^{4}$ molecules presented. We have studied the composition and structure of the clusters obtained from the H${_2}$ gas with different concentrations of $\it{para}$-H${_2}$ and $\it{ortho}$-H${_2}$ molecules. CARS spectra indicate the enrichment in $\it{ortho}$-H${_2}$ in the clusters.
Description
Author Institution: Department of Chemistry, University of Southern California, Los Angeles, CA 90089; Department of Chemistry, Iowa State University, Ames, IA 50011; Department of Chemistry, University of Southern California, Los Angeles, CA 90089