X-RAY EMISSION FROM THE METASTABLE COMPONENTS OF SLOWAr16+BEAM ON METALLIC SURFACES

H. Q. Zhang, X. M. Chen (), Z. Y. Liu, Z. H. Yang, J. Z. Xu, Y. Cui, X. Xu, J. X. Shao, X. A. Zhang, Y. T. Zhao, Y. P. Zhang and G. Q. Xiao
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H. Q. Zhang: Department of Modern Physics, Lanzhou University, Lanzhou 730000, China
X. M. Chen: Department of Modern Physics, Lanzhou University, Lanzhou 730000, China
Z. Y. Liu: Department of Modern Physics, Lanzhou University, Lanzhou 730000, China
Z. H. Yang: Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
J. Z. Xu: Department of Modern Physics, Lanzhou University, Lanzhou 730000, China
Y. Cui: Department of Modern Physics, Lanzhou University, Lanzhou 730000, China
X. Xu: Department of Modern Physics, Lanzhou University, Lanzhou 730000, China
J. X. Shao: Department of Modern Physics, Lanzhou University, Lanzhou 730000, China
X. A. Zhang: Normal College of Xianyang, Xianyang 713000, China
Y. T. Zhao: Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
Y. P. Zhang: Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
G. Q. Xiao: Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China

Surface Review and Letters (SRL), 2009, vol. 16, issue 03, 463-467

Abstract: K-shell X-ray emission was observed in the neutralization process ofAr16+interacting with beryllium and molybdenum at slow speed (less than Bohr velocity). The K-shell X-ray emission came from the metastable component ofAr16+beam with the configuration (1s2s) produced from electron cyclotron resonance ion source. The intensity ratio ofKβX-ray emission toKαX-ray emission(IKβ/IKα)in the neutralization process decreased when the kinetic energy of the projectile increased. This is closely related to the flight time the projectiles spend above the surface, which is dominated by both the work function of the metal and the normal velocity component of the incident ions to the surface according to the classical over-barrier model. As the relation betweenIKβ/IKαand the above-flight time shows, the longer time above the surface the larger ratio due to the above-surface contribution. Furthermore, the smaller work function leads to the smaller contribution from the above surface.

Keywords: MetastableAr16+; x-ray; molybdenum and beryllium surfaces (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X0901286X

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