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Photoelectron angul...
Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses
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Ma, R. (author)
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Motomura, K. (author)
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Ishikawa, K. L. (author)
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Mondal, S. (author)
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Fukuzawa, H. (author)
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Yamada, A. (author)
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Ueda, K. (author)
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Nagaya, K. (author)
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Yase, S. (author)
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Mizoguchi, Y. (author)
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Yao, M. (author)
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Rouze, A. (author)
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Hundermark, A. (author)
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Vrakking, M. J. J. (author)
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- Johnsson, Per (author)
- Lund University,Lunds universitet,Atomfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Atomic Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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Nagasono, M. (author)
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Tono, K. (author)
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Togashi, T. (author)
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Senba, Y. (author)
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Ohashi, H. (author)
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Yabashi, M. (author)
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Ishikawa, T. (author)
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(creator_code:org_t)
- 2013-08-13
- 2013
- English.
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In: Journal of Physics B: Atomic, Molecular and Optical Physics. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 46:16
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Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Ma, R.
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Motomura, K.
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Ishikawa, K. L.
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Mondal, S.
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Fukuzawa, H.
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Yamada, A.
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show more...
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Ueda, K.
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Nagaya, K.
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Yase, S.
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Mizoguchi, Y.
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Yao, M.
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Rouze, A.
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Hundermark, A.
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Vrakking, M. J. ...
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Johnsson, Per
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Nagasono, M.
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Tono, K.
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Togashi, T.
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Senba, Y.
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Ohashi, H.
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Yabashi, M.
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Ishikawa, T.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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Journal of Physi ...
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Lund University