Two- and three-photon double ionization of helium by soft x-ray free-electron laser pulses

被引：7

作者：

Shimada, Hiroyuki ^{[1
]}

Komatsu, Kazma ^{[2
]}

Komatsubara, Wataru ^{[2
]}

Mizuno, Tomoya ^{[3
]}

Miyake, Soichiro ^{[2
]}

Minemoto, Shinichirou ^{[2
]}

Sakai, Hirofumi ^{[2
]}

Majima, Takuya ^{[4
]}

Owada, Shigeki ^{[5
,6
]}

Togashi, Tadashi ^{[5
,6
]}

Yabashi, Makina ^{[5
,6
]}

Yagishita, Akira ^{[1
]}

机构：

[1] KEK, Inst Mat Struct Sci, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan

[2] Univ Tokyo, Grad Sch Sci, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[3] Univ Tokyo, Inst Solid State Phys, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778581, Japan

[4] Kyoto Univ, Quantum Sci & Engn Ctr, Uji, Kyoto 6110011, Japan

[5] Japan Synchrotron Radiat Res Inst, 1-1-1 Kouto, Sayo, Hyogo 6795198, Japan

[6] RIKEN, SPring 8 Ctr, 1-1-1 Kouto, Sayo, Hyogo 6795148, Japan

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2019年 / 52卷 / 06期

关键词：

two-photon double ionization; resonant ionization; photoelectron angular distribution; 2-PHOTON DOUBLE-IONIZATION; EXTREME-ULTRAVIOLET; CROSS-SECTIONS; HE; PHOTOELECTRON; EXCITATION; RADIATION; BEAMLINE; SINGLE;

D O I：

10.1088/1361-6455/ab0580

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The multiphoton double ionization of He was investigated using a soft x-ray free-electron laser (SX-FEL), in the perturbative intensity regime (<10(13) W cm(-2)). The photon energy was tuned to the transition between the 1s and 2p levels of He+ ions. At this resonance energy of 40.8 eV, both sequential three-photon double ionization (S3PDI) and two-photon double ionization (2PDI) were measured by electron spectroscopy and by ion time-of-flight mass spectroscopy. We distinguished S3PDI from 2PDI by electron spectroscopy. Based on these experimental data, SX-FEL pulse-energy dependences of electron and ion yields for both S3PDI and 2PDI were discussed. The angular distribution of 2p photoelectrons emitted from He+ (2p) ions in the S3PDI process was examined as an example of the simplest photoemission dynamics.

引用

页数：8

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