Issue
Europhys. Lett.
Volume 76, Number 4, November 2006
Page(s) 582 - 587
Section Atomic and molecular physics
DOI http://dx.doi.org/10.1209/epl/i2006-10325-0
Published online 18 October 2006
Europhys. Lett., 76 (4), pp. 582-587 (2006)
DOI: 10.1209/epl/i2006-10325-0

Scattering of hydrogen atoms at low temperature

A. Sen, S. Chakraborty and A. S. Ghosh

Department of Theoretical Physics, Indian Association for the Cultivation of Science Jadavpur, Kolkata-700 032, India

tpasg@mahendra.iacs.res.in

received 9 August 2006; accepted in final form 26 September 2006
published online 18 October 2006

Abstract
A non-adiabatic model is employed to investigate the H-H scattering at low temperatures. Unlike molecular-orbital calculation technique, no separate calculations are required to obtain the potential energies of electrons in the field of hadrons. This model generates the non-adiabatic effective potential automatically. The coefficients of van der Waals and higher-order potentials are estimated in the present model and are found to be in very good agreement with the corresponding standard values. The s-wave singlet and triplet scattering lengths and thermal-average total triplet cross-section at 2$\un{K}$ are reported and compared with the existing theoretical and experimental predictions.

PACS
34.50.-s - Scattering of atoms and molecules.
31.15.Ar - Ab initio calculations.

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