<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ν</mi><mn>4</mn></msub></math></span> band of CH<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mrow></mrow><mn>4</mn></msub></math></span> in helium nanodroplets: A probe of the dynamical response of a superfluid

Aakash Ravi; Susumu Kuma; Christopher Yearwood; Birinder Kahlon; Majd Mustafa; Watheq Al-Basheer; Katsunari Enomoto; Takamasa Momose

doi:10.1103/PhysRevA.84.020502

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$ν_{4}$ band of CH $_{4}$ in helium nanodroplets: A probe of the dynamical response of a superfluid

Aakash Ravi^*, Susumu Kuma^†, Christopher Yearwood, Birinder Kahlon, Majd Mustafa, Watheq Al-Basheer, Katsunari Enomoto^‡, and Takamasa Momose^§

Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada

^*Present address: University of Waterloo, Waterloo, ON N2L 3G1, Canada.
^†Present address: Research Core for Extreme Quantum World, Okayama University, Okayama 700-8530, Japan.
^‡On leave from Department of Physics, University of Toyama, Toyama 930-8555, Japan.
^§momose@chem.ubc.ca

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Phys. Rev. A 84, 020502(R) – Published 26 August, 2011

DOI: https://doi.org/10.1103/PhysRevA.84.020502

Abstract

The triply degenerate $ν_{4}$ bending mode of methane in superfluid helium nanodroplets was observed at 7.7 $μ$ 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 $_{4}$ .

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$ν_{4}$ band of CH $_{4}$ in helium nanodroplets: A probe of the dynamical response of a superfluid

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ν4 band of CH4 in helium nanodroplets: A probe of the dynamical response of a superfluid

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$ν_{4}$ band of CH $_{4}$ in helium nanodroplets: A probe of the dynamical response of a superfluid