Anomalous vibrational excitation in the small angle scattering of He+ from HCl at Elab=20-60 eV

Thomas , Ruhaltinger and Jan Peter , Toennies and Ruigang , Wang and Ibrahim Ali , Noorbatcha and Susanta , Mahapatra and Narayanasami , Sathyamurthy (1995) Anomalous vibrational excitation in the small angle scattering of He+ from HCl at Elab=20-60 eV. Journal Of Physical Chemistry, 99 (42). pp. 15544-15550. ISSN 0022-3654

PDF (Anomalous vibrational excitation in the small angle scattering of He+ from HCl at Elab=20-60 eV) - Published Version Restricted to Registered users only Download (682kB) | Request a copy

Abstract

Energy loss spectra of forward scattered He+ ions in collisions with HCl are reported for collision energies (E(lab)) in the range 20-60 eV. The spectra extend up to total energy transfers of about 2.5 eV, where the intensity is 6 orders of magnitude less than the elastic forward peak. At large energy transfers a number of broad maxima indicating a propensity for large Delta v transitions are observed. Three-dimensional quasiclassical trajectory calculations treating HCl as a rigid rotor for the long range ion-dipole/quadrupole He+-HCl interaction and a short range repulsion corresponding to the isoelectronic He+-Ar account for much of the energy transfer at low Delta E. At higher Delta E, the rigid rotor model is dearly inadequate and a better description of the experiment requires consideration of high lying repulsive states of HCl+ which appear to be temporarily accessed by charge transfer.

Item Type:	Article (Journal)
Additional Information:	3704/35864
Uncontrolled Keywords:	Chemistry, Physical
Subjects:	Q Science > QD Chemistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User:	Prof. Dr. Ibrahim Ali Noorbatcha
Date Deposited:	04 Mar 2014 11:39
Last Modified:	09 Mar 2014 10:21
URI:	http://irep.iium.edu.my/id/eprint/35864

Actions (login required)

View Item