High resolution quantum cascade laser studies of the 3 band of methyl fluoride in solid para-hydrogen

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DOIResolve DOI: http://doi.org/10.1063/1.3640888
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TypeArticle
Journal titleJournal of Chemical Physics
ISSN0021-9606
Volume135
Issue12
Article number124511
SubjectHigh resolution; Methyl fluoride; Para-hydrogen; Persistent feature; Quantum cascades; Spectral feature; Spectral line; Symmetry axis; Hydrogen; Spectroscopy; Quantum cascade lasers; fluorinated hydrocarbon; fluoromethane; hydrogen; article; chemistry; laser; quantum theory; Hydrocarbons, Fluorinated; Hydrogen; Lasers; Quantum Theory
AbstractSpectra of solid para-H2 doped with CH3F at 1.8K are studied in the 3 region (∼1040 cm-1) using a quantum cascade laser source. As shown previously, residual ortho-H2 in the sample (∼1000 ppm) gives rise to distinct spectral features due to clusters of the form CH3F-(ortho-H2)N, with N = 0, 1, 2, 3, etc. Brief annealing at 7K is found to give narrower spectral lines (≥0.006 cm-1) than conventional (5K) annealing, and causes the N 3 and 4 lines to fragment into two or more components. The N 3 line is observed to be particularly stable and persistent. The N = 0 line (no ortho-H2 neighbors) is resolved into two closely spaced (≈0.007 cm-1) components which are assigned to the K = 0 and 1 states of CH3F rotating around its C3v symmetry axis (ortho- and para-CH 3F, respectively). Similar K-structure is also evident for other lines. Weak but persistent features (N 1/2 lines) are observed mid way between N 0 and 1. © 2011 American Institute of Physics.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Steacie Institute for Molecular Sciences (SIMS-ISSM)
Peer reviewedYes
NPARC number21271546
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Record identifier368e4bac-8663-415d-a615-921f61479f30
Record created2014-03-24
Record modified2017-03-23
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