研究・研究者
研究会・セミナー
| 演 題 | 「強レーザー場と分子の相互作用：キラル分子の配向制御とアト秒電子ダイナミクスの探究」 |
|---|---|
| 日 時 | 2012年10月02日(火) 13:30 |
| 講演者 | 竹本 典生（イスラエル ワイツマン研究所） |
| 場 所 | 分子科学研究所 研究棟 301セミナー室 |
| 概 要 |
Intense laser fields induce interesting and useful phenomena on atoms and molecules. For example, the strong electric field of the laser light inhibits the free rotation of molecules in a gaseous ensemble. We show by numerical simulations that this effect can be exploited to fix the three-dimensional orientation of chiral molecules in a laboratory frame [1]. In this orientation scheme, a pair of enantiomers are oriented as mirror images of each other. Therefore, one of the enantiomers can be selectively photo-decomposed by applying an additional laser field. Another example of laser induced phenomena is ionization. This process has been considered to be well described by the tunnel ionization picture, which predicts that an electron is released once in a half-cycle of the laser field oscillation. However, we report results of numerical simulations showing that the simplest molecule, H_2^+, can exhibit multiple bursts of ionization within a half-laser-cycle [2]. The origin of these multiple bursts is identified to be in a counter-intuitive quantum dynamics of the electronic wavepacket inside the molecule on the attosecond time scale. We present experimental evidence of such an ultrafast intra-molecular electron dynamics in H_2^+ [3]. Finally, we are currently working to elucidate and control how the correlated dynamics of multiple electrons unfolds on the attosecond time scale with intense and ultrafast laser pulses. Toward this goal, we have been developing an accurate and efficient method to simulate the time evolution of a quantum wavepacket based on a phase space perspective. |
| お問合せ先 | 大森賢治 |
