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Excited atoms in cavities of liquid He I: long-range interatomic repulsion and broadening of atomic lines *

Published online by Cambridge University Press:  15 February 2013

Vladimir M. Atrazhev ,
Jussi Eloranta ,
Nelly Bonifaci ,
Hai van Nguyen ,
Frederic Aitken ,
Klaus von Haeften  and
G. Vermeulen
Vladimir M. Atrazhev*
Affiliation:
Joint Institute for High Temperatures, RAS, Moscow 125412, Russia
Jussi Eloranta
Affiliation:
Department of Chemistry and Biochemistry, California State University, Northridge, California 91330, USA
Nelly Bonifaci
Affiliation:
Laboratoire G2Elab CNRS & Joseph Fourier University, 25 rue des Martyrs, 38042 Grenoble, France
Hai van Nguyen
Affiliation:
Laboratoire G2Elab CNRS & Joseph Fourier University, 25 rue des Martyrs, 38042 Grenoble, France
Frederic Aitken
Affiliation:
Laboratoire G2Elab CNRS & Joseph Fourier University, 25 rue des Martyrs, 38042 Grenoble, France
Klaus von Haeften
Affiliation:
Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK
G. Vermeulen
Affiliation:
Laboratoire IN CNRS & Joseph Fourier University, 25 rue des Martyrs, 38042 Grenoble, France
*
ae-mail: atrazhev@yandex.ru
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Abstract

A theoretical analysis of the line broadening of localized atomic transitions in liquid helium is presented. It is shown that accurate information can be derived on the long-range part of the He*-He interaction as well as on the local structure near the He* emitters. The analysis confirms that in corona discharges in liquid helium the emitting He* atoms reside in cavities and that for known He*-He interaction the size of the cavities can be deduced from the line profile. The He*-He interaction was calculated using the full configuration interaction (CI) method as implemented in the Molpro package. The widths of atomic lines due to fluorescent transitions between different excited states of helium atoms were calculated as a function of external pressure in the range from 0.1 and 3.5 MPa using the static approximation method, and the input from the results of the CI calculation and cavity diameters calculated using the bubble model. The calculated widths showed excellent agreement with experimental data of liquid helium excited by corona discharges. A second, analytical analysis using a power function to represent the He*-He interaction showed qualitative agreement with the experimental data.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 61 , Issue 2: Topical issue: 13th International Symposium on High Pressure Low Temperature Plasma Chemistry (Hakone XIII). Edited by Nicolas Gherardi, Henryca Danuta Stryczewska and Yvan Ségui , February 2013 , 24302
Copyright
© EDP Sciences, 2013

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Footnotes

*

Contribution to the Topical Issue “13th International Symposium on High Pressure Low Temperature Plasma Chemistry (Hakone XIII)”, Edited by Nicolas Gherardi, Henryca Danuta Stryczewska and Yvan Ségui.

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