Charge dependent energy loss of 60 MeV 58Niq+ ions in argon gas

被引：4

作者：

Schmelmer, O ^{[1
]}

Dollinger, G ^{[1
]}

Frey, CM ^{[1
]}

Bergmaier, A ^{[1
]}

Karsch, S ^{[1
]}

机构：

[1] Tech Univ Munich, Phys Dept E12, D-85748 Garching, Germany

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 1998年 / 146卷 / 1-4期

关键词：

energy loss; charge state; charge fractions; screening;

D O I：

10.1016/S0168-583X(98)90484-0

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Energy loss and charge fractions of 60 MeV Ni-58(q+) ions in argon gas (0.1-16 mu g/cm(2)) have been measured by means of a Q3D magnetic spectrograph in dependence of the incident and analysed charge state of the ions. The measurements show energy loss phenomena at argon gas thicknesses where the charge state distribution is not in equilibrium. For the charge state q = 8+ the stopping power at small target thickness deviates significantly from the value at larger gas thickness. The stopping power of q = 18+ is almost the same as for q = 14+ but energy loss shows a step at about 2 mu g/cm(2). The deviation of the stopping power at small gas thickness is a combination of two effects. The evolution of the ion's mean charge with increasing target thickness and a selection of impact parameter in collisions between projectiles and gas atoms. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：95 / 100

页数：6