PHOTOION SPECTRA IN COINCIDENCE WITH THRESHOLD ELECTRONS NEAR THE KR 3D IONIZATION LIMITS

被引:20
作者
HAYAISHI, T
YAGISHITA, A
MURAKAMI, E
SHIGEMASA, E
MORIOKA, Y
SASAKI, T
机构
[1] UNIV TSUKUBA,INST PHYS,TSUKUBA,IBARAKI 305,JAPAN
[2] CHIBA INST TECHNOL,NARASHINO,CHIBA 275,JAPAN
[3] TOHOKU UNIV,SCI MEASUREMENTS RES INST,SENDAI,MIYAGI 980,JAPAN
[4] NATL LAB HIGH ENERGY PHYS,PHOTON FACTORY,TSUKUBA,IBARAKI 305,JAPAN
关键词
D O I
10.1088/0953-4075/23/10/007
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Photoion spectra of Kr near the 3d ionisation limits have been measured using a threshold electron-photoion coincidence technique. The spectra of Kr2+ and Kr3+ ions show structures corresponding to the 3d-1np Rydberg states below the ionisation limits and to 3d 5/2 and 3d3/2 ionisation above the ionisation limits. It is proposed that the lower Rydberg states can decay by emitting threshold electrons through two-step autoionisation, such as Kr 3d-15p to Kr+ 4p-2(1S)6p to Kr2+ 4p -2(3P) and Kr 3d-15p to Kr2+ 4s -14p-2np (n>or=5) to Kr3+ 4p-3. The structures due to 3d threshold ionisation show the effect of post-collision interaction, namely peak shifts and asymmetric profiles. The shifts are almost the same in the Kr2+ and Kr3+ spectra.
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收藏
页码:1633 / 1639
页数:7
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