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Title: Excimers in the Lowest Rotational Quantum State in Liquid Helium
Authors: Mendoza-Luna, L. G.
Shiltagh, N. M. K.
Watkins, M. J.
Bonifaci, N.
Aitken, F.
von Haeften, Klaus
First Published: 3-Nov-2016
Publisher: American Chemical Society
Citation: Journal of Physical Chemistry Letters, 2016
Abstract: 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.
DOI Link: 10.1021/acs.jpclett.6b02081
eISSN: 1948-7185
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: Archived with reference to SHERPA/RoMEO and publisher website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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