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

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Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses. / Ma, R.; Motomura, K.; Ishikawa, K. L.; Mondal, S.; Fukuzawa, H.; Yamada, A.; Ueda, K.; Nagaya, K.; Yase, S.; Mizoguchi, Y.; Yao, M.; Rouze, A.; Hundermark, A.; Vrakking, M. J. J.; Johnsson, Per; Nagasono, M.; Tono, K.; Togashi, T.; Senba, Y.; Ohashi, H.; Yabashi, M.; Ishikawa, T.

I: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 46, Nr. 16, 164018, 2013.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

Ma, R, Motomura, K, Ishikawa, KL, Mondal, S, Fukuzawa, H, Yamada, A, Ueda, K, Nagaya, K, Yase, S, Mizoguchi, Y, Yao, M, Rouze, A, Hundermark, A, Vrakking, MJJ, Johnsson, P, Nagasono, M, Tono, K, Togashi, T, Senba, Y, Ohashi, H, Yabashi, M & Ishikawa, T 2013, 'Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses', Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 46, nr. 16, 164018. https://doi.org/10.1088/0953-4075/46/16/164018

APA

CBE

Ma R, Motomura K, Ishikawa KL, Mondal S, Fukuzawa H, Yamada A, Ueda K, Nagaya K, Yase S, Mizoguchi Y, Yao M, Rouze A, Hundermark A, Vrakking MJJ, Johnsson P, Nagasono M, Tono K, Togashi T, Senba Y, Ohashi H, Yabashi M, Ishikawa T. 2013. Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses. Journal of Physics B: Atomic, Molecular and Optical Physics. 46(16). https://doi.org/10.1088/0953-4075/46/16/164018

MLA

Vancouver

Author

Ma, R. ; Motomura, K. ; Ishikawa, K. L. ; Mondal, S. ; Fukuzawa, H. ; Yamada, A. ; Ueda, K. ; Nagaya, K. ; Yase, S. ; Mizoguchi, Y. ; Yao, M. ; Rouze, A. ; Hundermark, A. ; Vrakking, M. J. J. ; Johnsson, Per ; Nagasono, M. ; Tono, K. ; Togashi, T. ; Senba, Y. ; Ohashi, H. ; Yabashi, M. ; Ishikawa, T. / Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses. I: Journal of Physics B: Atomic, Molecular and Optical Physics. 2013 ; Vol. 46, Nr. 16.

RIS

TY - JOUR

T1 - Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses

AU - Ma, R.

AU - Motomura, K.

AU - Ishikawa, K. L.

AU - Mondal, S.

AU - Fukuzawa, H.

AU - Yamada, A.

AU - Ueda, K.

AU - Nagaya, K.

AU - Yase, S.

AU - Mizoguchi, Y.

AU - Yao, M.

AU - Rouze, A.

AU - Hundermark, A.

AU - Vrakking, M. J. J.

AU - Johnsson, Per

AU - Nagasono, M.

AU - Tono, K.

AU - Togashi, T.

AU - Senba, Y.

AU - Ohashi, H.

AU - Yabashi, M.

AU - Ishikawa, T.

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

U2 - 10.1088/0953-4075/46/16/164018

DO - 10.1088/0953-4075/46/16/164018

M3 - Article

VL - 46

JO - Journal of Physics B: Atomic, Molecular and Optical Physics

JF - Journal of Physics B: Atomic, Molecular and Optical Physics

SN - 0953-4075

IS - 16

M1 - 164018

ER -