FEMTOSECOND THERMIONIC EMISSION FROM METALS IN THE SPACE-CHARGE-LIMITED REGIME

被引：108

作者：

RIFFE, DM ^{[1
]}

WANG, XY ^{[1
]}

DOWNER, MC ^{[1
]}

FISHER, DL ^{[1
]}

TAJIMA, T ^{[1
]}

ERSKINE, JL ^{[1
]}

MORE, RM ^{[1
]}

机构：

[1] LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550

来源：

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 1993年 / 10卷 / 08期

关键词：

D O I：

10.1364/JOSAB.10.001424

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study femtosecond-laser-pulse-induced electron emission from W(100), Al(110), and Ag(111) in the sub-damage regime (1-44 mJ/cm2 fluence) by simultaneously measuring the incident-light reflectivity, total electron yield, and electron-energy distribution curves of the emitted electrons. The total-yield results are compared with a space-charge-limited extension of the Richardson-Dushman equation for short-time-scale thermionic emission and with particle-in-a-cell computer simulations of femtosecond-pulsed-induced thermionic emission. Quantitative agreement between the experimental results and two calculated temperature-dependent yields is obtained and shows that the yield varies linearly with temperature beginning at a threshold electron temperature of approximately 0.25 eV. The particle-in-a-cell simulations also reproduce the experimental electron-energy distribution curves. Taken together, the experimental results, the theoretical calculations, and the results of the simulations indicate that thermionic emission from nonequilibrium electron heating provides the dominant source of the emitted electrons. Furthermore, the results demonstrate that a quantitative theory of space-charge-limited femtosecond-pulse-induced electron emission is possible.

引用

页码：1424 / 1435

页数：12

共 51 条

[1] THEORY OF THERMAL RELAXATION OF ELECTRONS IN METALS [J].