PRECISION-MEASUREMENT OF STRONG-FIELD DOUBLE-IONIZATION OF HELIUM

被引：953
|
作者：
WALKER, B
SHEEHY, B
DIMAURO, LF
AGOSTINI, P
SCHAFER, KJ
KULANDER, KC
机构：
[1] CTR ETUD SACLAY,SERV RECH SURFACES & IRRADIAT MAT,F-91191 GIF SUR YVETTE,FRANCE
[2] LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551
[3] UNIV COLORADO,JOINT INST LAB ASTROPHYS,BOULDER,CO 80309
来源：
PHYSICAL REVIEW LETTERS | 1994年 / 73卷 / 09期
关键词：
D O I：
10.1103/PhysRevLett.73.1227
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The production of He+ and He-2+ by a 160 fs, 780 nm laser has been measured over an unprecedented 12 orders of magnitude in counting range. Enhanced double electron emission, called nonsequential (NS) ionization. was observed over an intensity range where the single ionization dynamics is evolving from multiphoton to pure tunneling. The NS yield is found to scale with the ac-tunneling rate for the neutral, even when tunneling is not the dominant ionization pathway. A rescattering mechanism fails to predict the observed NS threshold or magnitude.
引用
收藏
页码：1227 / 1230
页数：4
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