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Permanent link (DOI): https://doi.org/10.7939/R34B2XD39

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Microscopic Superfluidity in Small Helium Clusters Doped with Hydrogen Cyanide Open Access

Descriptions

Other title
Subject/Keyword
Hydrogen Cyanide
Microwave Spectroscopy
van der Waals Complexes
Superfluid Helium
Hyperfine Structure
HCN
Chirped-Pulse
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Dempster, Steve P
Supervisor and department
Jäger, Wolfgang (Chemistry)
Examining committee member and department
McDermott, Mark (Chemistry)
Rivard, Eric (Chemistry)
Department
Department of Chemistry
Specialization

Date accepted
2012-09-28T14:18:19Z
Graduation date
2012-09
Degree
Master of Science
Degree level
Master's
Abstract
The construction and use of a broadband Fourier-transform microwave spectrometer utilizing linear frequency sweeps will be presented along with a brief theoretical description of its operation principle. This instrument and a narrowband, cavity-based spectrometer were used to measure the high resolution microwave spectra of the J=1–0 transitions of small HeN–H12C14N, HeN–H13C14N, HeN–H12C15N, HeN–D12C14N, and HeN–D13C14N clusters produced in a supersonic jet expansion. Spectroscopic analysis revealed that the observed effective rotational constants, Beff, initially decreased with the number of the attached helium atoms before reaching a minimum at N=3 helium atoms for all isotopologues. The subsequent increase in Beff for N≥4 is indicative of the onset of microscopic superfluidity. Comparison of our experimental Beff constants with those from quantum Monte Carlo simulations reveals a nearly congruent trend in Beff up to N=6. An analysis of the hyperfine structure of the 14N containing isotopologues and the isotopic data is also provided.
Language
English
DOI
doi:10.7939/R34B2XD39
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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