Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/3125
Title: Orientation dependence of multiple ionisation of a diatomic molecule under proton impact
Authors: SHARMA, DEEPAK K.
BAPAT, BHAS
Bhatt, Pragya
Safvan, C. P.
Dept. of Physics
Keywords: Ion-molecule collisions
Anisotropy
Momentum imaging
Asymmetry
Multiple ionisation
TOC-JUN-2019
2019
Issue Date: Jun-2019
Publisher: IOP Publishing
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics, 52(11).
Abstract: Fragmentation of multiply ionised ${\mathrm{CO}}^{n+}(n\leqslant 4)$ molecular ions is investigated using the coincidence momentum imaging technique in an experiment involving proton–CO collisions over the energy range 25–200 keV. From the measured momentum vectors of the fragment ions, the orientation angle—that is the angle between the axis of the molecule and the direction of the projectile at the instant of collision—is determined under the axial recoil approximation. The multiple ionisation yield is found to strongly depend on the orientation angle, giving rise to an anisotropy as well as a forward–backward asymmetry, reflecting the heteronuclear nature of the CO target. A simple model is used to calculate the probability of multiple ionisation, involving Rutherford-like trajectories with an orientation dependent distance of closest approach and an impact parameter dependent single ionisation probability. The computed probabilities show an orientation dependence which agrees closely with experimental observations.
URI: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/3125
https://doi.org/10.1088/1361-6455/ab17ee
ISSN: 0953-4075
1361-6455
Appears in Collections:JOURNAL ARTICLES

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