Light emissions from sputtered particles produced during ion bombardment of Al(111) and polycrystalline Al surfaces

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/39018

Title:	Light emissions from sputtered particles produced during ion bombardment of Al(111) and polycrystalline Al surfaces
Authors:	Lee,CS;Chang,YC;Chang,YH
Contributors:	物理研究所
Keywords:	MEASURED STOPPING POWERS;TARGETS
Date:	1999
Issue Date:	2010-07-08 14:02:20 (UTC+8)
Publisher:	中央大學
Abstract:	The photon emissions from excited Al atoms produced by different ion projectiles (e.g. He+, N+, Ne+, and Ar+) and projectile energies (10, 15, and 20 keV) bombarding single and polycrystalline Al targets were measured. The measured photon signals were analyzed by two different methods. The first one compares the measured photon yields and calculated nuclear stopping powers to each other. This comparison reveals that when both are a function of the reduced energy they have the same tendency. This result indicates that elastic collisions play the main role in producing the observed photon emissions. The other method analyzes the measured photon decay curves, as a function of the target moving distance in the consideration of the photon cascade effect. In the experiment we found that all the detected photon signals originated from fast moving sputtered particles. From the above observations, the production of sputtered and excited Al atoms can be referred to as a combination of the curve-crossing process and a binary-collision between the projectile and target atoms on or very near the target surface. When Ar+ and Ne+ ions bombarded an Al(111) target, this transformed the Al(111) into a polycrystalline Al target. Therefore, both targets under ion bombardment yield the same mean velocity of the sputtered particles and had the same photon cascade effect. (C) 1999 Elsevier Science B.V. All rights reserved.
Relation:	NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Appears in Collections:	[Graduate Institute of Physics] journal & Dissertation

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