International workshop on theory for attosecond quantum dynamics (IWTAQD) 25

 

supported in part by World Research Unit (B-1) of Reaction Infography (R-ing) at Nagoya University



Aug 4-5 at Bldg E6-Rm525 & Bldg E5-Rm341, UEC



back to IWTAQD page

Participants

Zhangjin Chen	Shantou U	Non-seq double ionization theory	Aug 4, 2022
Hao Liang	Peking U	theory of Chirality in strong field	Aug 4, 2022
Shinichi Fukahori	U of T	Molecular alignmnet	Aug 4, 2022
Reika Kanya	Tokyo Met. U.	electron scattering under strong field	Aug 4, 2022
Yoshiaki Kumagai	Tokyo U of A&M	FEL experiment	Aug 4, 2022
Mizuho Fushitani	Nagoya U	FEL experiment	Aug 3-5, 2022
Akiyosi Hishikawa	Nagoya U	Co-Chair, Molecular tunneling ionization experiment	Aug 3-5, 2022
Chiennan Liu	Fu-jen catholic U	Strong field theory	Aug 4, 2022
Farhan Saif	Quaid-i-Azam U	Atomic Physics theory	Aug 3-5, 2022
Fredelic Ongonwou	UEC	Molecular dynamics	Aug 3-5, 2022
Takahiro Harima	UEC	Molecular dynamics	Aug 3-5, 2022
Yuichiro Saito	UEC	Numerical calc.	Aug 3-5, 2022
Yuma Hamakawa	UEC	Rescattering	Aug 3-5, 2022
Ryuya Kojima	UEC	Inhomogenious equation	Aug 3-5, 2022
Yuta Saito	UEC	Molecular Siegert state	Aug 3-5, 2022
Shinichi Watanabe	UEC	Professor emeritus, International Student Center, Head	Aug 4, 2022
Michio Matsuzawa	UEC	Professor emeritus	Aug 4, 2022
Takayoshi Kobayashi	UEC	Laser Physics	Aug 4, 2022
Toru Morishita	UEC	Chair	Aug 3-5, 2022

Workshop Program (tentative)

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Aug 4  (Thr) 2022

On-site (Bldg East 5, Rm341) & Online (zoom) session  Time is in JST (UTC+9000)

(25 min talk + 5 min discussion)
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13:00-14:00  FREE DISCUSSION (please check connection/sharing screen during this time
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14:00-14:30 Zhangjin Chen (Shantou U)
"Anticorrelation in nonsequential double ionization"
Abstract:
In view of the long-standing controversial debate on the mechanisms responsible for anticorrelation in nonsequential double ionization (NSDI), we recently calculated the correlated two-electron momentum distributions for NSDI of He atoms subject to an intense 400 nm linearly polarized laser pulse below the threshold intensity, using the improved quantitative rescattering model (QRS) in which the lowering of the threshold due to the presence of the electric field at the instant of recollision is taken into account. The QRS model successfully predicted distinct correlated back-to-back emission of the electrons along the polarization direction and an alternative mechanism responsible for the anticorrelation was suggested. It is found that the “delayed” recollision time predominantly determines the parallel momentum distribution of the tunneling electron and plays a decisive role in forming anticorrelation. In addition, anticorrelation in NSDI of Ar in elliptically polarized laser fields has also been investigated.

14:30-15:00 Yoshiaki Kumagai (Tokyo U of A & T)
"Ultrafast electronic and nuclear dynamics in atomic clusters induced by hard-x-ray lasers
Abstract:
To investigate ultrafast electronic and nuclear dynamics in the nanoparticles induced by the hard-x-ray laser, we have conducted electron and ion spectroscopies for atomic clusters irradiated with an x-ray free electron laser (XFEL)  pulse. The dedicated molecular-dynamics simulations can track the real-space dynamics of the atoms and charged particles. With the provided theoretical insight the experimental observations elucidate the entire dynamics which happens in the atomic clusters induced by the XFEL pulse, and demonstrate a versatile method with weak laser fields as probe for tracking the ultrafast dynamics of the nanoplasma.

15:00-15:30 Mizuho Fushitani (Nagoya U)
"Observation of resonant core-to-core transitions of Kr in intense EUV-FEL fields"
Abstract:
Nonlinear ionization of Kr atoms with ultrashort EUV-FEL pulses (~120 eV, ~30 fs) was investigated by using electron-ion coincidence spectroscopy. Highly charged Kr^{Z+} ions upto Z = 4 associated with 3d inner-shell ionization were observed. Electron spectra obtained in coincidence with Kr^{3+} ions exhibited several sharp peaks between 65 and 95 eV, which can be assigned to 3p Auger electrons produced by resonant core-to-core transitions from the 3d^{-1} to the 3p^{-1} states.

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15:30-15:50  FREE DISCUSSION
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15:50-16:20 Hao Liang (Peking U)
"Discriminate Chiral Molecules with an Intense Linear Polarized Pulse"
Abstract:
Normally, people use circular polarized pulses, or the combination of linear polarized pulses with different polarized directions, to discriminate chiral molecules. This talk will show the possibilities to observe chiral effect with single linear polarized pulse and chiral molecules by taking nondipole correction into account. This effect is predicted by simple symmetry analysis and confirmed by TDSE calculations of a model chiral system, a three-step model is made to repeat the results semi-quantitatively.

16:20-16:50 Shinichi Fukahori (U of Tokyo)
"Ionization and rotational dynamics of molecules induced by an intense femtosecond laser field"
We examined the dependence of the molecular ionization probability on the angle between the molecular axis and the laser polarization direction in an intense femtosecond laser field by recording the ion yield as a function of the delay time between the pump pulse for the rotational wave packet creation and the probe pulse for the ionization. In the case of H_2O, we found that ionization is enhanced when the molecular c axis, which is perpendicular to the molecular plane, is parallel to the laser polarization direction, showing that the photoelectron is emitted from the highest occupied 1b_1 orbital. On the other hand, in the case of O_2, we recorded the delay dependence of the kinetic energy distribution of O^+ and found that the angular dependence of the dissociative ionization probability varies sensitively depending on the kinetic energy of O^+, suggesting that the dissociative ionization of O_2 originating from the emission from the 3σ_g and 1π_u orbitals can be securely distinguished.

16:50-17:20 Reika Kanya (Toyo Met. U)
"Observation of THz-wave-assisted electron scattering by Ar atoms"
Abstract:
This talk will report the first observation of THz-wave assisted electron scattering (TAES) processes, through which electrons (1.0 keV) scattered by Ar in a monocycle THz-wave (0.6 THz) field gain and lose their energy. The magnitude of the energy gain and loss reaches the energy of as many as ~ 800 photons of the THz-wave, exhibiting the extremely high-order energy exchanges, and the observed characteristic asymmetries in the azimuthal-angle dependence of the energy spectra of TAES signals are reproduced well quantitatively by the theoretical TAES signals calculated using the modified Kroll-Watson formula and the experimentally determined THz-wave form.

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17:20-18:20 FREE DISCUSSION
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Aug 5  (Fri) 2022

On-site (Bldg. East-6, Rm 525)

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10:00-12:00 FREE DISCUSSION
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Toru Morishita,UEC