Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses

被引：20

作者：

Ma, R. ^{[1
,2
,3
]}

Motomura, K. ^{[1
,2
]}

Ishikawa, K. L. ^{[4
]}

Mondal, S. ^{[1
]}

Fukuzawa, H. ^{[1
,2
]}

Yamada, A. ^{[1
,2
]}

Ueda, K. ^{[1
,2
]}

Nagaya, K. ^{[2
,5
]}

Yase, S. ^{[2
,5
]}

Mizoguchi, Y. ^{[2
,5
]}

Yao, M. ^{[2
]}

Rouze, A. ^{[6
,7
]}

Hundermark, A. ^{[6
,7
]}

Vrakking, M. J. J. ^{[6
,7
]}

Johnsson, P. ^{[8
]}

Nagasono, M. ^{[2
]}

Tono, K. ^{[9
]}

Togashi, T. ^{[9
]}

Senba, Y. ^{[9
]}

Ohashi, H. ^{[2
,9
]}

Yabashi, M. ^{[2
]}

Ishikawa, T. ^{[2
]}

机构：

[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

[2] RIKEN SPring 8 Ctr, Mikazuki, Hyogo 6795148, Japan

[3] Jilin Univ, Inst Atom & Mol Phys, Changchun 130012, Peoples R China

[4] Univ Tokyo, Photon Sci Ctr, Grad Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan

[5] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[6] Max Born Inst, D-12489 Berlin, Germany

[7] FOM Inst AMOLF, NL-1098 XG Amsterdam, Netherlands

[8] Lund Univ, Dept Phys, SE-22100 Lund, Sweden

[9] Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2013年 / 46卷 / 16期

基金：

瑞典研究理事会;

关键词：

ABOVE-THRESHOLD IONIZATION; SINGLE IONIZATION; FEMTOSECOND; COHERENCE; OPERATION; ATOMS; PHASE; HE;

D O I：

10.1088/0953-4075/46/16/164018

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The two-photon ionization of helium atoms by ultrashort extreme-ultraviolet free-electron laser pulses, produced by the SPring-8 Compact SASE Source test accelerator, was investigated at photon energies of 20.3, 21.3, 23.0 and 24.3 eV. The angular distribution of photoelectrons generated by two-photon ionization is obtained using a velocity map imaging spectrometer. The phase-shift differences and amplitude ratios of the outgoing s and d continuum wave packets are extracted from the photoelectron angular distributions. The obtained values of the phase-shift differences are distinct from scattering phase-shift differences when the photon energy is tuned to a resonance with an excited level or Rydberg manifold. The difference stems from the co-presence of resonant and non-resonant path contributions in the two-photon ionization by femtosecond pulses. Since the relative contribution of both paths can be controlled in principle by the pulse shape, these results illustrate a new way to tailor the continuum wave packet.

引用

页数：6

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