Competition of sequential and direct paths in two-photon ionization of he

Kenichi L. Ishikawa; Ri Ma; H. Fukuzawa; K. Motomura; A. Yamada; K. Ueda; K. Nagaya; S. Yase; Y. Mizoguchi; M. Yao; A. Rouzee; A. Hundermark; M. Vrakking; P. Johnsson; M. Nagasono; T. Togashi; K. Tono; Y. Senba; H. Ohashi; M. Yabashi; T. Ishikawa

doi:10.1088/1742-6596/388/3/032012

Competition of sequential and direct paths in two-photon ionization of he

Kenichi L. Ishikawa, Ri Ma, H. Fukuzawa, K. Motomura, A. Yamada, K. Ueda, K. Nagaya, S. Yase, Y. Mizoguchi, M. Yao, A. Rouzee, A. Hundermark, M. Vrakking, P. Johnsson, M. Nagasono, T. Togashi, K. Tono, Y. Senba, H. Ohashi, M. YabashiT. Ishikawa

Division of Measurements

Research output: Contribution to journal › Conference article

Abstract

We study the photoelectron angular distribution (PAD) from the two-photon ionization (TPI) of He by femtosecond EUV pulses. The calculation with the time-dependent Schrödinger equation (TDSE) and the measurement at the SPring-8 EUV-FEL show reasonable agreement. The extracted relative phase δ between the s and d wave packets are distinct from that between the corresponding eigenstates, due to the competition between sequential and direct ionization paths. When the pulse is resonant with an excited level, the sequential and direct TPI compete with each other, and δ and the PAD depend on the pulse width. On the other hand, when the Ry-dberg manifold is coherently excited, δ does not vary with the pulse width.

Original language	English
Article number	032012
Journal	Journal of Physics: Conference Series
Volume	388
Issue number	PART 3
DOIs	https://doi.org/10.1088/1742-6596/388/3/032012
Publication status	Published - 2012 Jan 1
Event	27th International Conference on Photonic, Electronic and Atomic Collisions, ICPEAC 2011 - Belfast, United Kingdom Duration: 2011 Jul 27 → 2011 Aug 2

ASJC Scopus subject areas

Physics and Astronomy(all)

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Ishikawa, K. L., Ma, R., Fukuzawa, H., Motomura, K., Yamada, A., Ueda, K., Nagaya, K., Yase, S., Mizoguchi, Y., Yao, M., Rouzee, A., Hundermark, A., Vrakking, M., Johnsson, P., Nagasono, M., Togashi, T., Tono, K., Senba, Y., Ohashi, H., ... Ishikawa, T. (2012). Competition of sequential and direct paths in two-photon ionization of he. Journal of Physics: Conference Series, 388(PART 3), [032012]. https://doi.org/10.1088/1742-6596/388/3/032012

Competition of sequential and direct paths in two-photon ionization of he. / Ishikawa, Kenichi L.; Ma, Ri; Fukuzawa, H.; Motomura, K.; Yamada, A.; Ueda, K.; Nagaya, K.; Yase, S.; Mizoguchi, Y.; Yao, M.; Rouzee, A.; Hundermark, A.; Vrakking, M.; Johnsson, P.; Nagasono, M.; Togashi, T.; Tono, K.; Senba, Y.; Ohashi, H.; Yabashi, M.; Ishikawa, T.

In: Journal of Physics: Conference Series, Vol. 388, No. PART 3, 032012, 01.01.2012.

Research output: Contribution to journal › Conference article

Ishikawa, KL, Ma, R, Fukuzawa, H, Motomura, K, Yamada, A, Ueda, K, Nagaya, K, Yase, S, Mizoguchi, Y, Yao, M, Rouzee, A, Hundermark, A, Vrakking, M, Johnsson, P, Nagasono, M, Togashi, T, Tono, K, Senba, Y, Ohashi, H, Yabashi, M & Ishikawa, T 2012, 'Competition of sequential and direct paths in two-photon ionization of he', Journal of Physics: Conference Series, vol. 388, no. PART 3, 032012. https://doi.org/10.1088/1742-6596/388/3/032012

Ishikawa, Kenichi L. ; Ma, Ri ; Fukuzawa, H. ; Motomura, K. ; Yamada, A. ; Ueda, K. ; Nagaya, K. ; Yase, S. ; Mizoguchi, Y. ; Yao, M. ; Rouzee, A. ; Hundermark, A. ; Vrakking, M. ; Johnsson, P. ; Nagasono, M. ; Togashi, T. ; Tono, K. ; Senba, Y. ; Ohashi, H. ; Yabashi, M. ; Ishikawa, T. / Competition of sequential and direct paths in two-photon ionization of he. In: Journal of Physics: Conference Series. 2012 ; Vol. 388, No. PART 3.

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title = "Competition of sequential and direct paths in two-photon ionization of he",

abstract = "We study the photoelectron angular distribution (PAD) from the two-photon ionization (TPI) of He by femtosecond EUV pulses. The calculation with the time-dependent Schr{\"o}dinger equation (TDSE) and the measurement at the SPring-8 EUV-FEL show reasonable agreement. The extracted relative phase δ between the s and d wave packets are distinct from that between the corresponding eigenstates, due to the competition between sequential and direct ionization paths. When the pulse is resonant with an excited level, the sequential and direct TPI compete with each other, and δ and the PAD depend on the pulse width. On the other hand, when the Ry-dberg manifold is coherently excited, δ does not vary with the pulse width.",

author = "Ishikawa, {Kenichi L.} and Ri Ma and H. Fukuzawa and K. Motomura and A. Yamada and K. Ueda and K. Nagaya and S. Yase and Y. Mizoguchi and M. Yao and A. Rouzee and A. Hundermark and M. Vrakking and P. Johnsson and M. Nagasono and T. Togashi and K. Tono and Y. Senba and H. Ohashi and M. Yabashi and T. Ishikawa",

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T1 - Competition of sequential and direct paths in two-photon ionization of he

AU - Ishikawa, Kenichi L.

AU - Ma, Ri

AU - Fukuzawa, H.

AU - Motomura, K.

AU - Yamada, A.

AU - Ueda, K.

AU - Nagaya, K.

AU - Yase, S.

AU - Mizoguchi, Y.

AU - Yao, M.

AU - Rouzee, A.

AU - Hundermark, A.

AU - Vrakking, M.

AU - Johnsson, P.

AU - Nagasono, M.

AU - Togashi, T.

AU - Tono, K.

AU - Senba, Y.

AU - Ohashi, H.

AU - Yabashi, M.

AU - Ishikawa, T.

PY - 2012/1/1

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N2 - We study the photoelectron angular distribution (PAD) from the two-photon ionization (TPI) of He by femtosecond EUV pulses. The calculation with the time-dependent Schrödinger equation (TDSE) and the measurement at the SPring-8 EUV-FEL show reasonable agreement. The extracted relative phase δ between the s and d wave packets are distinct from that between the corresponding eigenstates, due to the competition between sequential and direct ionization paths. When the pulse is resonant with an excited level, the sequential and direct TPI compete with each other, and δ and the PAD depend on the pulse width. On the other hand, when the Ry-dberg manifold is coherently excited, δ does not vary with the pulse width.

AB - We study the photoelectron angular distribution (PAD) from the two-photon ionization (TPI) of He by femtosecond EUV pulses. The calculation with the time-dependent Schrödinger equation (TDSE) and the measurement at the SPring-8 EUV-FEL show reasonable agreement. The extracted relative phase δ between the s and d wave packets are distinct from that between the corresponding eigenstates, due to the competition between sequential and direct ionization paths. When the pulse is resonant with an excited level, the sequential and direct TPI compete with each other, and δ and the PAD depend on the pulse width. On the other hand, when the Ry-dberg manifold is coherently excited, δ does not vary with the pulse width.

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