Understand and control the ionization processes of atoms and molecules in strong two-color laser fields

• Project/Area Number: 16K05495
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: University of Tsukuba
• Principal Investigator: Tong XiaoMin 筑波大学, 計算科学研究センター, 准教授 (80422210)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 強レーザー場 / 原子励起と電離 / アト秒物理 / 楕円偏光 / 強レーザー / 原子電離 / 電離励起 / 時間依存密度汎関数 / 高速フーリエ変換 / 原子・分子 / 反陽子 / 衝突 / Poisson 方程式 / FFT / 原子・分子物理 / 擬ポテンシャル / 円偏光レーザー

Outline of Final Research Achievements

We have developed a new time-dependent density functional method based on FFT for atoms, molecules, clusters and nano-particles in a strong laser field. Based on the method, we have investigated the ionization and dissociation processes of hydrogen molecules, oxygen molecules in an intense laser field and based the understanding we proposed a way to control the dynamics processes by intense lasers. Meanwhile, to cope with the researches on the generating a circularly polarized attosecond pulse, we have investigated the related processes, atomic ionization in two-color circularly polarized laser fields and our results are in good agreement with experiments. Specially, we have developed a theory to treat the photo-ionization and photo-excitation of atoms in a strong elliptically polarized field in a unified way and the method can be used for many dynamics processes.

Academic Significance and Societal Importance of the Research Achievements

本研究は基礎研究である。学術意義について三の点から述べる。（１）計算方法の開発：より精度の良い時間依存密度汎関数の計算方法を開発し、強レーザーにおけるナノ粒子の動的過程を理論計算で調べることができる。（２）基礎過程の解明：理論計算で、強レーザー場の補助で水素分子や酸素分子X線での電離と解離のメカニズムを解明し、基礎の過程に対して、理解できる。（３）動的過程の制御：メカニズムの解明による、レーザーの強度やX―線との到着の時間遅延で電離と解離過程の制御ができることを明らかになった。

Research Products

• [Int'l Joint Research] Institute of theoretical physics/Vienna Technology University(オーストリア)
• [Int'l Joint Research] Australian Attosecond Science Facility/Griffith University(Australia)
• [Journal Article] Observation of dynamic Stark resonances in strong-field excitation (2020)
  • Author(s): Chetty D.、Glover R. D.、deHarak B. A.、Tong X. M.、Xu H.、Pauly T.、Smith N.、Hamilton K. R.、Bartschat K.、Ziegel J. P.、Douguet N.、Luiten A. N.、Light P. S.、Litvinyuk I. V.、Sang R. T.
  • Journal Title: Physical Review A Volume: 101 Issue: 5 Pages: 053402-053402
  • DOI: 10.1103/physreva.101.053402
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Theory of bound state coherences generated by optical attosecond pulses (2020)
  • Author(s): W. C. Jiang, X. M. Tong, R. Pazourek, S. Nagele, and J. Burgdorfer
  • Journal Title: Physical Review A Volume: 101 Issue: 5 Pages: 053435-053435
  • DOI: 10.1103/physreva.101.053435
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Coulomb effect on the dynamics of atoms in a strong elliptical laser field: Unification of the excitation and ionization (2019)
  • Author(s): Gao Xiang、Tong Xiao-Min
  • Journal Title: Physical Review A Volume: 100 Issue: 6 Pages: 063424-063424
  • DOI: 10.1103/physreva.100.063424
  • NAID: 120007132708
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Roadmap on photonic, electronic and atomic collision physics: I. Light?matter interaction (2019)
  • Author(s): Ueda Kiyoshi、Sokell Emma、Schippers Stefan、Aumayr Friedrich、Sadeghpour Hossein、Burgdorfer Joachim、Lemell Christoph、Tong Xiao-Min、et al.,
  • Journal Title: Journal of Physics B: Atomic, Molecular and Optical Physics Volume: 52 Issue: 17 Pages: 171001-171001
  • DOI: 10.1088/1361-6455/ab26d7
  • NAID: 120007132956
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Photoelectron angular distribution of atoms in pulsed XUV and IR fields (2019)
  • Author(s): Tong Xiao-Min
  • Journal Title: Physical Review A Volume: 99 Issue: 4 Pages: 043422-043422
  • DOI: 10.1103/physreva.99.043422
  • NAID: 120007133532
  • Peer Reviewed
• [Journal Article] Attosecond coherent control of oxygen dissociation by XUV-IR laser fields using three-dimensional momentum imaging (2018)
  • Author(s): Ranitovic P.、Sturm F. P.、Tong X. M.、Wright T. W.、Ray D.、Zalyubovskya I.、Shivaram N.、Belkacem A.、Slaughter D. S.、Weber Th.
  • Journal Title: Physical Review A Volume: 98 Issue: 1
  • DOI: 10.1103/physreva.98.013410
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Electron correlations in the antiproton energy-loss distribution in He (2018)
  • Author(s): Borbely S.、Tong X.-M.、Nagele S.、Feist J.、Brezinov I.、Lackner F.、Nagy L.、Tokesi K.、Burgdorfer J.
  • Journal Title: Physical Review A Volume: 98 Issue: 1
  • DOI: 10.1103/physreva.98.012707
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Revealing the role of electron-electron correlations by mapping dissociation of highly excited D2+ using ultrashort XUV pulses (2018)
  • Author(s): Martin L.、Bello R. Y.、Hogle C. W.、Palacios A.、Tong X. M.、Sanz-Vicario J. L.、Jahnke T.、Schoffler M.、Dorner R.、Weber Th.、Mart?n F.、Kapteyn H. C.、Murnane M. M.、Ranitovic P.
  • Journal Title: Physical Review A Volume: 97 Issue: 6
  • DOI: 10.1103/physreva.97.062508
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Ab initio multiscale simulation of high-order harmonic generation in solids (2018)
  • Author(s): Isabella Floss, Christoph Lemell, Georg Wachter, Valerie Smejkal, Shunsuke A. Sato, Xiao-Min Tong, Kazuhiro Yabana, and Joachim Burgdorfer
  • Journal Title: Physical Review A Volume: 97 Issue: 1
  • DOI: 10.1103/physreva.97.011401
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Transition from nonsequential to sequential double ionization in many-electron systems (2017)
  • Author(s): M. G. Pullen, B. Wolter, X. Wang, X. M. Tong, M. Sclafani, M. Baudisch, H. Pires, C. D. Schroter, J. Ullrich, T. Pfeifer, R. Moshammer, J. H. Eberly, and J. Biegert
  • Journal Title: Physical Review A Volume: 96 Issue: 3
  • DOI: 10.1103/physreva.96.033401
  • NAID: 120007134847
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Sub-cycle directional control of the dissociative ionization of H2 in tailored femtosecond laser fields (2017)
  • Author(s): H. Li, X. Gong, K. Lin, R. de Vivie-Riedle, X.M. Tong, J. Wu, and M.F. Kling
  • Journal Title: J. Phys. B Volume: 50 Issue: 17 Pages: 172001-172001
  • DOI: 10.1088/1361-6455/aa8243
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A three-dimensional time-dependent Schrodinger equation solver: An application to hydrogen atoms in an elliptical laser field (2017)
  • Author(s): X. M. Tong
  • Journal Title: J. Phys. B Volume: 50 Issue: 14 Pages: 144004-144004
  • DOI: 10.1088/1361-6455/aa77a0
  • Peer Reviewed
• [Journal Article] Enhancement of strong-field ionization in two-color circularly polarized laser fields via photon-spin control (2017)
  • Author(s): C. A. Mancuso, K. M. Dorney, D. D. Hickstein, J. L. Chaloupka, X. M. Tong, J. L. Ellis, H. C. Kapteyn, and M. M. Murnane
  • Journal Title: Physical Review A Volume: 95 Issue: 1
  • DOI: 10.1103/physreva.95.012501
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] The interaction of excited atoms and few-cycle laser pulses (2016)
  • Author(s): J. E. Calvert, Han Xu, A. J. Palmer, R. D. Glover, D. E. Laban, X. M. Tong, A. S. Kheifets, K. Bartschat, I. V. Litvinyuk, D. Kielpinksi, and R. T. Sang
  • Journal Title: Scientific Reports Volume: 6 Issue: 1
  • DOI: 10.1038/srep34101
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Abnormal photoelectron angular distribution of Ar atoms in pulsed XUV and IR laser fields (2019)
  • Author(s): XM Tong and N Toshima
  • Organizer: XXXI International Conference on photonic, electronic and atomic collision, July 23-30, 2019 Deauville, France
  • Int'l Joint Research
• [Presentation] Photoabsorption of atoms in a strong elliptical laser field (2019)
  • Author(s): X Gao and XM Tong
  • Organizer: XXXI International Conference on photonic, electronic and atomic collision, July 23-30, 2019 Deauville, France
  • Int'l Joint Research
• [Presentation] Energy loss of p and p in He: electron correlation effects (2019)
  • Author(s): S Borbely, XM Tong, S Nagele, J Feist, I Brezinova, F Lackner, L Nagy, K Tokesi and J Burgdorfe
  • Organizer: XXXI International Conference on photonic, electronic and atomic collision, July 23-30, 2019 Deauville, France
  • Int'l Joint Research
• [Presentation] Comparing the performance of time-dependent-Schrodinger-equation solvers for the 800-nm, one-electron-atom, strong-field problem (2018)
  • Author(s): BD Esry, ..., XM Tong, J Svensmark
  • Organizer: 49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
• [Presentation] Ionization of Atoms and Di-Atomic Molecules in Two Color Circularly Polarized Intense Laser Fields (2018)
  • Author(s): X. M Tong
  • Organizer: The 10th Asian Symposium on Intense Laser Science, Mar. 10~13, 2018, American University of Sharjah, United Arab Emirates
  • Int'l Joint Research / Invited
• [Presentation] Giant Resonances in Atoms (2017)
  • Author(s): X. M. Tong
  • Organizer: シンポジウム「原子過程科学の歩みと将来」 Sept. 10, 2017, 上智大学四谷キャンパス
• [Presentation] A new FFT based TDDFT method for an isolated system in strong field (2017)
  • Author(s): X. M. Tong
  • Organizer: Physical Chemistry Colloquium 2017 Sept. 19~20, 2017, Tohoku University, Sendai, Japan
• [Presentation] Simulation of High Harmonic Generation in Solids (2017)
  • Author(s): I Floss, G Wachter, C Lemell, S Sato, XM Tong, K Yabana, J Burgdorfer
  • Organizer: XXX International Conference on Photonic, Electronic and Atomic Collisions, July 26~ Aug. 1, 2017, Cairns, Australia
  • Int'l Joint Research
• [Presentation] Energy straggling cross section for antiproton-atom collisions (2017)
  • Author(s): XM Tong, S Borbely, I Brezinova, F Lackner, S Nagele, J Feist, L Nagy,K Tokesi, N Toshima, J Burgdorfer
  • Organizer: XXX International Conference on Photonic, Electronic and Atomic Collisions, July 26 -- Aug. 1, 2017, Cairns, Australia
  • Int'l Joint Research
• [Presentation] A New FFT based TDDFT method for isolated systems in strong field (2017)
  • Author(s): X. M. Tong
  • Organizer: 2nd International Conference on Matter and Radiation at Extremes, June 26-30, 2017, Beijing, China
  • Int'l Joint Research / Invited
• [Presentation] Strong Field Ionization of N2 Molecules in Two-Colour Circularly Polarized Laser Field (2016)
  • Author(s): Xiao-Min Tong, Nobuyuki Toshima
  • Organizer: 12th European Conference on Atoms Molecules and Photons
  • Place of Presentation: Frankfurt, Germany
  • Year and Date: 2016-09-05
  • Int'l Joint Research