{nu}{sub 4} band of CH{sub 4} in helium nanodroplets: A probe of the dynamical response of a superfluid

Journal Article · Mon Aug 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.020502· OSTI ID:22068458

Ravi, Aakash; Kuma, Susumu; Yearwood, Christopher; Kahlon, Birinder; Mustafa, Majd; Al-Basheer, Watheq; Enomoto, Katsunari; Momose, Takamasa ^[1]

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1. Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1 (Canada)

The triply degenerate {nu}{sub 4} bending mode of methane in superfluid helium nanodroplets was observed at 7.7 {mu}m by high-resolution infrared depletion spectroscopy. Five rotational transitions were detected, with a minimum linewidth of only 65 MHz. The observed lines showed slightly asymmetric line shapes, especially in the case of the P(2) and R(1) rotational lines. Analysis of the line shape indicates that the superfluid environment has a finite response time of a few nanoseconds to equilibrate upon rotational excitation of CH{sub 4}.

• OSTI ID: 22068458
• Journal Information: Physical Review. A, Vol. 84, Issue 2; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
EXCITATION
HELIUM
INFRARED SPECTROMETERS
METHANE
MHZ RANGE 01-100
SPECTROSCOPY
SUPERFLUIDITY