FAR-INFRARED MULTIPHOTON IONIZATION OF LITHIUM RYDBERG ATOMS BYPASSING A COOPER MINIMUM

被引：14

作者：

HOOGENRAAD, JH ^{[1
]}

VRIJEN, RB ^{[1
]}

VANAMERSFOORT, PW ^{[1
]}

VANDERMEER, AFG ^{[1
]}

NOORDAM, LD ^{[1
]}

机构：

[1] FOM,INST PLASMA PHYS,3439 MN NIEUWEGEIN,NETHERLANDS

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.75.4579

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Multiphoton excitation and ionization studies of the Li 23s state by 20 ps far-infrared laser pulses originating from the free-electron laser FELIX are presented. The two-photon ionization cross section of highly excited Rydberg s states is small, due to a newly discovered Cooper minimum in the bound-bound ns-n'p transitions. Instead of this lowest-order process, ionization proceeds via a remarkable multiphoton bypass starting with stimulated emission to a lower-lying state. The measurements are interpreted with calculations of the Cooper minimum and a Floquet analysis of the states involved in the bypass.

引用

页码：4579 / 4582

页数：4

共 11 条

[1] QUANTITATIVE THEORY OF 2-PHOTON IONIZATION OF ALKALI ATOMS [J].