Study on the attosecond multi-level tunnel ionization processes that form an electron wavepacket.

2015 Fiscal Year Final Research Report

• Project/Area Number: 25247069
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Waseda University
• Principal Investigator: Hiromichi Niikura 早稲田大学, 理工学術院, 教授 (10500598)
• Co-Investigator(Kenkyū-buntansha): Morishita Toru 電気通信大学, 情報理工学(系)研究科, 准教授 (20313405) ; IWAKURA Izumi 神奈川大学, 工学部, 准教授 (40517083)
• Co-Investigator(Renkei-kenkyūsha): Madesen L. B. Aarhus University ; Tolstikhin O. I. Moscow institute of physics and technology
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: トンネルイオン化 / アト秒科学 / 高次高調波 / 再衝突電子

Outline of Final Research Achievements

We have developed the experimental and theoretical approaches to study the multi-level tunnel ionization process induced by intense, laser pulses. First, we have measured the two-dimensional high-harmonic spectra emitted from aligned molecules using two-color intense laser pulses. By controlling the alignment angle, we control the contribution of the levels that are related to the tunnel ionization and high-harmonic generation. Next, using the attosecond high-harmonics combined with the intense laser pulse, we have explored that a particular ionization channel is predominantly selected, that allows us to observe an phase-resolved electron wavefunction image with attosecond time-resolution. We have also developed the theoretical treatments regarding to the multi-level tunnel ionization process that includes the multi-electron effect.

Free Research Field

アト秒レーザー物理