Title
Concentration studies of collision-induced fundamental absorption of hydrogen dissolved in liquid neonConcentration studies of collision-induced fundamental absorption of hydrogen dissolved in liquid neon
Author
Faculty/Department
Faculty of Sciences. Chemistry
Research group
Molecular Spectroscopy
Publication type
article
Publication
New York, N.Y.,
Subject
Physics
Chemistry
Source (journal)
The journal of chemical physics. - New York, N.Y.
Volume/pages
137(2012):8, 18 p.
ISSN
0021-9606
Article Reference
084509
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We report further and more detailed results of our recent investigation [W. A. Herrebout, B. J. van der Veken, and A. P. Kouzov, Phys. Rev. Lett. 101, 093001 (2008)]10.1103/PhysRevLett.101.093001 on the collision-induced fundamental absorption by hydrogen dissolved in liquid neon (T ≈ 25 K). The band shapes were studied in a wide range of concentrations (0.0030.05 mole fractions) as well as for different ortho/para ratios and at much higher level of accuracy and resolution than before. Due to almost unhindered rotation of the hydrogen molecule and low temperature, an unprecedently rich frequency-domain picture produced by different terms of the interaction-induced polarization was observed. While some of them are conspicuous via fast intracell motion of a light guest (H2), othersinduced by the electrostatic field of the guestgive rise to lines whose shapes are imprinted by fluctuations of the nearest surrounding. Strong motional narrowing observed on the guest-guest induced lines shows up in their Lorentzian shapes which are signatures of microscopic-scale diffusion. Near-Lorentzian peaks were also detected at the tops of the diffuse lines induced by isolated guests. Their formation may be associated with a long-living defect (vacancy) emerging in the vicinity of the polarization inductor. Altogether, our results give the first unambiguous spectroscopic evidence on the diffusional evolution of isolated binary interactions that emerge in dense chaotic media.
E-info
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