POSITIVE-ION EMISSION FROM EXCIMER-LASER EXCITED MGO SURFACES

被引：90

作者：

DICKINSON, JT ^{[1
]}

LANGFORD, SC ^{[1
]}

SHIN, JJ ^{[1
]}

DOERING, DL ^{[1
]}

机构：

[1] WESLEYAN UNIV,DEPT PHYS,MIDDLETOWN,CT 06459

来源：

PHYSICAL REVIEW LETTERS | 1994年 / 73卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.73.2630

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report measurements of the energy and angular distributions of positive ions (principally Mg+) photodesorbed from polished MgO crystals exposed to 248 nm excimer laser radiation. At low laser fluences, kinetic energies of several eV are observed and angular distributions are highly peaked in the direction perpendicular to the surface. We present an electrostatic model involving Coulombic repulsion of positively charged ions repelled by photoionized F centers.

引用

页码：2630 / 2633

页数：4

共 21 条

[1]

CHASE LL, 1991, LASER ABLATION MECHA, P193

[2]

DAHL DA, 1988, EGGCS7233 EG G ID RE

[3]

Dickinson J. T., 1993, AIP Conference Proceedings, P13, DOI 10.1063/1.44907

[4] INTERACTIONS OF WIDE-BAND GAP SINGLE-CRYSTALS WITH 248 NM EXCIMER-LASER RADIATION .3. THE ROLE OF CLEAVAGE-INDUCED DEFECTS IN MGO [J].