International workshop on theory for attosecond quantum dynamics (IWTAQD) 27

 



Apr 19-20 at Bldg E6-Rm525 & 803, UEC






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Participants

Lars Bojer Madsen
 		Aarhus U
 Strong field Physics theory
 Apr 19, 2023
Hideki Ohmura
 AIST
 tunneling ionization experiment
 Apr 19-20, 2023
Akiyosi Hishikawa
 Nagoya U Molecular tunneling ionization experiment Apr 19-20, 2023
Yuya Morimoto
 RIKEN
 ultrashort electron beam
 Apr 19, 2023




Farhan Saif
 Quaid-i-Azam U Atomic Physics theory Apr 19-20, 2023




Chiennan Liu Fu-jen catholic U Strong field theory Apr 19-20, 2023
Hiroka Hasegawa
 UEC
 Molecular dissociation
 Apr 19-20, 2023
Saeed Muhammad UEC Many electron systems Apr 19-20, 2023
Shehroz Khalid UEC Molecular ionization
 Apr 19-20, 2023
Fredelic Ongonwou
 UEC High-order harmonics
 Apr 19-20, 2023
Takahiro Harima UEC Molecular dynamics Apr 19-20, 2023
Yushi Ishida UEC
Apr 19-20, 2023
Narihisa Tsuzuki UEC
Apr 19-20, 2023
Jens Svensmark
 U-Next
Apr 19, 2023




Yusuke Furukawa
 UEC
Apr 19-20, 2023
Shinichi Watanabe
 UEC
 Professor emeritus, International Student Center, Head
 Apr 19-20, 2023
Michio Matsuzawa
 UEC
 Professor emeritus
 Apr 19-20, 2023








Toru Morishita UEC Chair Apr 19-20, 2023



Workshop Program (tentative)

Apr 19  (Wed) 2023

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10:00-13:00  FREE DISCUSSION (Place: Bldg East 6, Rm525)
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Talks will take place at Bldg East 6, Rm803
(25 min talk + 5 min discussion)
 13:00-13:30 Akiyoshi Hishikawa (Nagoya U)
"Tunnel electron spectroscopy of small molecules in circularly polarized laser fields"
Abstract:
We report tunnel-electron spectroscopy of small molecules in circularly polarized laser fields (1035 nm, ~10^14 W/cm^2). We discuss the electron-ion coincidence momentum imaging of Ar (3p) and H2 (1s sigma), where differences in the transverse momentum distributions (TMD) of tunnel electrons are clearly identified. The molecular-frame photoelectron angular distribution (MFPAD) of O2 (HOMO-1) measured with auxiliary dissociation laser pulses is also presented.

13:30-14:00 Hideki Ohmura (AIST)
"Orientation-selective molecular tunneling ionization of hydrofluorocarbon using intense phase-controlled laser field"
Abstract:
We have investigated the molecular tunneling ionization of hydrofluorocarbons (HFCs), which are well known as alternative of chlorofluorocarbons or hydrochlorofluorocarbons,  induced by femtosecond phase-controlled two-color laser fields consisting of a fundamental light and its second-harmonic light. We observed phase-dependent orientation-selective molecular ionization in the HFC-152a and the HFC-134a molecules. The mechanism of molecular ionization is discussed in connection with the theory for molecular tunneling ionization based on the weak-field asymptotic theory (WFAT).

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14:00-14:30  FREE DISCUSSION (Place: Bldg East 6, Rm803)
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(50 min talk + 10 min discussion)
14:30-15:30 Lars Bojer Madsen (Aahrhus U)
"Atoms and solids in laser and electron pulses: nondipole and electron correlation effects"
Abstract:
Counterintuitively, in intense laser fields, terms beyond the electron-dipole approximation may become important as the wavelength of the driving field becomes long and enters the mid-infrared regime. In this talk, a nondipole theory is discussed and applied to above threshold ionization (ATI), where a nondipole-induced shift of the energy-conserving  ATI rings is identified. It is shown how these shifts cause the ATI peaks to disappear, and how they can be made reappear if the shift of the ATI rings is accounted for. In the adiabatic regime, it is shown how nondipole effects can be considered in the tunneling regime for the initial conditions used in two- and three-step models. The speaker also discusses  beyond-electric-dipole effects in intraband high-order harmonic generation in solids. In the last part of the talk, the speaker briefly reports on new findings regarding the impact of electron correlation on high-harmonic generation in solids, and ends with a perspective on applying ultrafast electron pulses for elucidating electron dynamics on the subfemtosecond timescale.



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15:30-18:00  FREE DISCUSSION (Place: To be announced)
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Apr 20  (Thr) 2023

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10:00-13:00 FREE DISCUSSION (Place: To be announced)
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Toru Morishita,UEC