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Photoelectron angular distributions in infrared one-photon and two-photon ionization of FEL-pumped Rydberg states of helium (Articolo in rivista)

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Photoelectron angular distributions in infrared one-photon and two-photon ionization of FEL-pumped Rydberg states of helium (Articolo in rivista) (literal)

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Alternative label

S Mondal1, H Fukuzawa1,2, K Motomura1, T Tachibana1, K Nagaya2,3, T Sakai3, K Matsunami3, S Yase3, M Yao3, S Wada2,4, H Hayashita4, N Saito2,5, C Callegari6, K C Prince6,7, P O'Keeffe8, P Bolognesi8, L Avaldi8, C Miron9, M Nagasono2, T Togashi10, M Yabashi2, K L Ishikawa11, I P Sazhina12, A K Kazansky13,14,15, N M Kabachnik1,12,14 and K Ueda1,2 (2013)
Photoelectron angular distributions in infrared one-photon and two-photon ionization of FEL-pumped Rydberg states of helium
in Journal of physics. B, Atomic molecular and optical physics (Print)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

S Mondal1, H Fukuzawa1,2, K Motomura1, T Tachibana1, K Nagaya2,3, T Sakai3, K Matsunami3, S Yase3, M Yao3, S Wada2,4, H Hayashita4, N Saito2,5, C Callegari6, K C Prince6,7, P O'Keeffe8, P Bolognesi8, L Avaldi8, C Miron9, M Nagasono2, T Togashi10, M Yabashi2, K L Ishikawa11, I P Sazhina12, A K Kazansky13,14,15, N M Kabachnik1,12,14 and K Ueda1,2 (literal)

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1 Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan 2 RIKEN SPring-8 Center, Kouto 1-1-1, Sayo, Hyogo 679-5148, Japan 3 Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan 4 Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan 5 National Institute of Advanced Industrial Science and Technology, NMIJ, Tsukuba 305-8568, Japan 6 Elettra-Sincrotrone Trieste, 34149 Basovizza, Trieste, Italy 7 eChemistry Laboratory, Faculty of Life and Social Sciences, Swinburne University of Technology, Melbourne, Victoria 3122, Australia 8 CNR-Instituto di Metodologie Inorganiche e dei Plasmi, Area della Ricerca di Roma 1, 00015 Monterotondo, Italy 9 Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, FR-91192 Gif-sur Yvette Cedex, France 10 Japan Synchrotron Radiation Research Institute (JASRI), Kouto 1-1-1, Sayo, Hyogo 679-5198, Japan 11 Photon Science Center, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan 12 Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia 13 Departamento de Fisica de Materiales, UPV/EHU, E-20018 San Sebastian/Donostia, Spain 14 Donostia International Physics Center (DIPC), E-20018 San Sebastian/Donostia, Spain 15 IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao, Spain (literal)

Titolo

Photoelectron angular distributions in infrared one-photon and two-photon ionization of FEL-pumped Rydberg states of helium (literal)

Abstract

The photoelectron angular distributions (PADs) have been investigated for infrared (IR) ionization of He atoms excited to Rydberg states by extreme ultraviolet free-electron laser pulses. The experiment was carried out with two pulses which do not overlap in time. Depending on the intensity of the IR pulses, one IR photon ionization or additionally two-photon above-threshold ionization is observed. For low IR intensity, the PAD is well described by a contribution of s and d partial waves in accordance with early experiments. At high IR intensity, the PAD for two IR photon ionization clearly shows the contribution of higher partial waves. The experimental data are compared with the results of theoretical calculations based on solving the time-dependent Schrödinger equation. (literal)

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