achemso_solvatedbubbles-kvh14.pdf (419.24 kB)
Excimers in the Lowest Rotational Quantum State in Liquid Helium
journal contributionposted 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.
CitationJournal of Physical Chemistry Letters, 2016
Author affiliation/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy
- AM (Accepted Manuscript)