Enhanced Nonlinear Double Excitation of He in Intense Extreme Ultraviolet Laser Fields

被引：37

作者：

Hishikawa, A. ^{[1
,2
,3
]}

Fushitani, M. ^{[1
,3
]}

Hikosaka, Y. ^{[3
,4
]}

Matsuda, A. ^{[1
,2
,3
]}

Liu, C. -N. ^{[5
]}

Morishita, T. ^{[6
,7
]}

Shigemasa, E. ^{[2
,3
]}

Nagasono, M. ^{[3
]}

Tono, K. ^{[8
]}

Togashi, T. ^{[8
]}

Ohashi, H. ^{[3
,8
]}

Kimura, H. ^{[3
,8
]}

Senba, Y. ^{[8
]}

Yabashi, M. ^{[3
,8
]}

Ishikawa, T. ^{[3
]}

机构：

[1] Nagoya Univ, Grad Sch Sci, Dept Chem, Nagoya, Aichi 4648602, Japan

[2] Natl Inst Nat Sci, Inst Mol Sci, Okazaki, Aichi 4448585, Japan

[3] RIKEN SPring 8, Sayo, Hyogo 6795148, Japan

[4] Niigata Univ, Dept Environm Sci, Niigata 9502181, Japan

[5] Fu Jen Catholic Univ, Dept Phys, Taipei 24205, Taiwan

[6] Univ Electrocommun, Dept Engn Sci, Tokyo 1828585, Japan

[7] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

[8] JASRI SPring 8, Sayo, Hyogo 6795198, Japan

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 24期

关键词：

FREE-ELECTRON LASER; HIGH-RESOLUTION; EXCITED-STATES; ATOMS; PHOTOIONIZATION; HELIUM; MOLECULES; PHOTOABSORPTION; AUTOIONIZATION; CLASSIFICATION;

D O I：

10.1103/PhysRevLett.107.243003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Nonlinear, three-photon double excitation of He in intense extreme ultraviolet free-electron laser fields (similar to 24.1 eV, similar to 5 TW/cm(2)) is presented. Resonances to the doubly excited states converging to the He(+) N = 3 level are revealed by the shot-by-shot photoelectron spectroscopy and identified by theoretical calculations based on the time-dependent Schrodinger equation for the two-electron atom under a laser field. It is shown that the three-photon double excitation is enhanced by intermediate Rydberg states below the first ionization threshold, giving a greater contribution to the photoionization yields than the two-photon process by more than 1 order of magnitude.

引用

页数：5

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