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Excimers in the Lowest Rotational Quantum State in Liquid Helium

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journal contribution
posted on 2016-11-07, 09:54 authored by L. G. Mendoza-Luna, N. M. K. Shiltagh, M. J. Watkins, N. Bonifaci, F. Aitken, Klaus von Haeften
Evidence for helium excimers (He∗_2) in the lowest allowed rotational quantum state in liquid helium is presented. He∗_2 was generated by a corona discharge in the gas and normal liquid phases. Fluorescence spectra recorded in the visible region between 3.8 and 5.0 K and 0.2 and 5.6 bar showed the rotationally resolved d3 Σ+ u → b3 Πg transition of He∗_2. Analysis of the pressure and temperature dependence of lineshifts and line intensities showed features of solvated He∗_2 superimposed on its gas phase spectrum and, in the liquid phase only, pressure-induced rotational cooling. These findings suggest that He∗_2 can be used to investigate bulk helium in different phases at the nanoscale.

History

Citation

Journal of Physical Chemistry Letters, 2016

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • AM (Accepted Manuscript)

Published in

Journal of Physical Chemistry Letters

Publisher

American Chemical Society

eissn

1948-7185

Acceptance date

2016-11-03

Available date

2017-11-03

Publisher version

http://pubs.acs.org/doi/abs/10.1021/acs.jpclett.6b02081

Language

en

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