Landau-Zener model for electron loss of low-energy negative fluorine ions to surface cations during grazing scattering on a LiF (001) surface

doi:10.1088/1674-1056/25/11/113401

Abstract There is no available theoretical description of electron transfer from negative projectiles at a velocity below 0.1 a.u. during grazing scattering on insulating surfaces. In this low-velocity range, electron-capture and electron-loss processes coexist. For electron capture, the Demkov model has been successfully used to explain the velocity dependence of the negative-ion fraction formed from fast atoms during grazing scattering on insulating surfaces. For electron loss, we consider that an electron may be transferred from the formed ionic diabatic quasi-molecular state to the formed covalent diabatic quasi-molecular state by the crossing of the potential curves of negative projectiles approaching the surface cations, which can be described by the Landau-Zener two-energy-level crossing model. Combining these two models, we obtain good agreement between the experimental and calculated data for the F^--LiF(001) collision system, which is briefly discussed.

Keywords: charge transfer negative ion grazing scattering ionic crystal

Received: 16 January 2016
Revised: 08 July 2016
Accepted manuscript online:

PACS:	34.35.+a	(Interactions of atoms and molecules with surfaces)
	78.55.Fv	(Solid alkali halides)
	79.20.Rf	(Atomic, molecular, and ion beam impact and interactions with surfaces)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11175075, 11405078, 11474140, 11404152, and 11305083).

Corresponding Authors: Lin Chen, Ximeng Chen
E-mail: chenlin@lzu.edu.cn;chenxm@lzu.edu.cn

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Wang Zhou(周旺), Meixiao Zhang(张鹛枭), Lihua Zhou(周利华), Hu Zhou(周虎), Yulong Ma(马玉龙), Yanling Guo(郭艳玲), Lin Chen(陈林), Ximeng Chen(陈熙萌) Landau-Zener model for electron loss of low-energy negative fluorine ions to surface cations during grazing scattering on a LiF (001) surface 2016 Chin. Phys. B 25 113401

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Landau-Zener model for electron loss of low-energy negative fluorine ions to surface cations during grazing scattering on a LiF (001) surface

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