Controlling XUV multi-photon ionization of atoms by intense IR laser pulses

• Project/Area Number: 18K03489
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
• Research Institution: University of Toyama
• Principal Investigator: Hikosaka Yasumasa 富山大学, 学術研究部教養教育学系, 教授 (00373192)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 自由電子レーザー / 多光子多重イオン化 / 多光子多重電離

Outline of Final Research Achievements

To realize quantum control of atomic and molecular processes in an extremely ultraviolet high-intensity laser field, we have established a basic measurement technology based on highly accurate time synchronization between a self-amplifying spontaneous emission type FEL and an external optical laser. By using single-shot photoelectron spectroscopy based on magnetic bottle-type electron analysis and a timing monitor system together, it has become possible to investigate target process with a time resolution that is an order of magnitude better than the timing jitter of two laser pulses.

Academic Significance and Societal Importance of the Research Achievements

近年の自由電子レーザー技術の革新により、極紫外域の高強度レーザー場と物質との相互作用に関する研究が大きく進展している。その研究のフロンティアの一つは、そのようなレーザー場における原子分子過程の量子制御の実現である。本研究では、自由電子レーザーと外部の光学レーザーとの高精度な時間同期に基づいた基盤計測技術の確立を実現した。磁気ボトル型電子分析によるシングルショット光電子分光とタイミングモニターシステムを併用することにより、２つのレーザーパルスのタイミングジッターよりも1桁優れた時間分解能でターゲットプロセスを調査できることを示した。

Research Products

• [Journal Article] Characterization of soft X-ray FEL pulse duration with two-color photoelectron spectroscopy (2020)
  • Author(s): Owada Shigeki、Fushitani Mizuho、Matsuda Akitaka、Fujise Hikaru、Sasaki Yuuma、Hikosaka Yasumasa、Hishikawa Akiyoshi、Yabashi Makina
  • Journal Title: Journal of Synchrotron Radiation Volume: 27 Issue: 5 Pages: 1362-1365
  • DOI: 10.1107/s1600577520008516
  • Peer Reviewed
• [Journal Article] Multielectron-Ion Coincidence Spectroscopy of Xe in Extreme Ultraviolet Laser Fields: Nonlinear Multiple Ionization via Double Core-Hole States (2020)
  • Author(s): Fushitani M.、Sasaki Y.、Matsuda A.、Fujise H.、Kawabe Y.、Hashigaya K.、Owada S.、Togashi T.、Nakajima K.、Yabashi M.、Hikosaka Y.、Hishikawa A.
  • Journal Title: Physical Review Letters Volume: 124 Issue: 19 Pages: 193201-193201
  • DOI: 10.1103/physrevlett.124.193201
  • Peer Reviewed
• [Journal Article] 極紫外レーザー場におけるXe原子の多電子－イオンコインシデンス分光：非線形DCH状態生成過程の観測 (2020)
  • Author(s): 伏谷瑞穂、松田晃孝、彦坂泰正、菱川明栄
  • Journal Title: SPring-8/SACLA利用者情報 Volume: 25 Pages: 272-277
  • Peer Reviewed / Open Access
• [Presentation] Electron-ion coincidence spectroscopy of Xe 4d double-core-hole states in strong XUV-FEL fields (2019)
  • Author(s): M. Fushitani, Y. Sasaki, A. Matsuda, H. Fujise, Y. Kawabe, K. Hashigaya, S. Owada, T. Togashi, K. Nakajima, M. Yabashi, Y. Hikosaka, A. Hishikawa
  • Organizer: 35th Symposium on Chemical Kinetics and Dynamics
  • Int'l Joint Research
• [Presentation] 電子-イオンコインシデンス分光によるXe4d内殻二重空孔状態の観測 (2019)
  • Author(s): 伏谷 瑞穂、佐々木 優馬、河辺 佳喬、藤瀬 光香、橋ヶ谷 かすみ、大和田 成起、富樫 格、中嶋 享、矢橋 牧名、松田 晃孝、彦坂泰正，菱川 明栄
  • Organizer: 第13回分子科学討論会
• [Presentation] Formation of Xe 4d double-core-hole states in strong XUV-FEL fields studied by electron-ion coincidence spectroscopy (2018)
  • Author(s): Y. Sasaki, H. Fujise, Y. Kawabe, K. Hashigaya, A. Matsuda, Y. Hikosaka, M. Fushitani, A. Hishikawa
  • Organizer: IRCCS The 2nd international symposium
  • Int'l Joint Research
• [Presentation] Ultrafast photoelectron spectroscopy of autoionizing Xe+ formed by XUV FEL (2018)
  • Author(s): M. Fushitani, Y. Kawabe, K. Hashigaya, A. Matsuda, S. Owada, T.Togashi, K. Nakajima, M. Yabashi, Y.Hikosaka, A. Hishikawa
  • Organizer: 34th symposium on chemical kinetics and dynamics
  • Int'l Joint Research