Pulse-delay effects in the angular distribution of near-threshold EUV + IR two-photon ionization of Ne (2014)

Pulse-delay effects in the angular distribution of near-threshold EUV + IR two-photon ionization of Ne (2014)

要旨訳:

フェムト秒極紫外(EUV)自由電子レーザーと近赤外(IR)レーザーの組み合わせによる、Ne原子のしきい値近傍での2光子イオン化による光電子角度分布(PAD)を実験的および理論的に調べた。時間依存シュレーディンガー方程式の解により、PADはEUVパルスとIRパルスの時間差に大きく依存していることが示された。この理論的予測は、完全に重ねたパルスと、全く重なっていないパルスという2つの極端なケースの実験結果からも確かめられた。PADの時間遅延依存性は、2色2光子イオン化過程における共鳴・非共鳴経路の相対的重要度という基本的な問題を研究する手段となるといえる。

Abstract:

Photoelectron angular distributions (PADs) from two-photon near-threshold ionization of Ne atoms by the combined action of femtosecond pulses from an extreme ultraviolet (EUV) free-electron laser and infrared (IR) laser have been studied experimentally and theoretically. Solutions of the time-dependent Schrödinger equation indicate that the PADs strongly depend on the time delay between EUV and IR pulses. The experimental results obtained for two extreme cases of completely overlapping and nonoverlapping pulses fully confirm the prediction, illustrating that the measurements of the time-delay dependence of the PAD provide a tool for investigating the fundamental problem of the relative importance of the resonant and nonresonant pathways in the two-color two-photon processes.

Source:

S. Mondal, H. Fukuzawa, K. Motomura, T. Tachibana, K. Nagaya, T. Sakai, K. Matsunami, S. Yase, M. Yao, S. Wada, H. Hayashita, N. Saito, C. Callegari, K. C. Prince, C. Miron, M. Nagasono, T. Togashi, M. Yabashi, K. L. Ishikawa, A. K. Kazansky, N. M. Kabachnik, and K. Ueda, Pulse-delay effects in the angular distribution of near-threshold EUV + IR two-photon ionization of Ne, Phys. Rev. A 89, 013415-1 (6 pages) (2014). (http://dx.doi.org/10.1103/PhysRevA.89.013415)

 

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