International workshop on theory for attosecond quantum dynamics (IWTAQD) 26

 




Mar 28-29 at Bldg E6-Rm525 & 803, UEC



back to IWTAQD page

Participants

Farhan Saif Quaid-i-Azam U Atomic Physics theory Mar 28-29, 2023

Yasushi Shinohara NTT Laser-Matter interaction theory
Mar 28, 2023
Kenta Mizuse
Kitasato U
Molecular rotational wave packet under intense laser fields
Mar 28, 2023
Hiroka Hasegawa
Nagoya U Molecular ionization under intense laser fields Mar 28-29, 2023
Mizuho Fushitani
Nagoya U FEL experiment Mar 28, 2023
Tomoya Mizuno
U of Tokyo
Atomic and Molecular dynamics in intense laser fields
Mar 28, 2023
Akiyosi Hishikawa
Nagoya U
Co-Chair, Molecular tunneling ionization experiment
Mar 28-29, 2023
Chiennan Liu Fu-jen catholic U Strong field theory Mar 28-29, 2023





Saeed Muhammad UEC Many electron systems Mar 28-29, 2023
Shehroz Khalid UEC Molecular ionization
Mar 28-29, 2023
Fredelic Ongonwou
UEC High-order harmonics
Mar 28-29, 2023
Takahiro Harima UEC Molecular dynamics Mar 28-29, 2023
Yuichiro Saito UEC Numerical calc. Mar 28-29, 2023
Yuma Hamakawa
UEC
Rescattering
Mar 28-29, 2023
Ryuya Kojima
UEC Inhomogenious equation
Mar 28-29, 2023
Yuta Saito UEC
Molecular Siegert state
Mar 28-29, 2023





Shinichi Watanabe
UEC
Professor emeritus, International Student Center, Head
Mar 28-29, 2023
Michio Matsuzawa
UEC
Professor emeritus
Mar 28-29, 2023
Hiroki Saito
UEC Quantum Fluid dynamics
Mar 28-29, 2023





Toru Morishita UEC Chair Mar 28-29, 2023



Workshop Program



Mar 28  (Tue) 2023

(25 min talk + 5 min discussion)
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10:00-13:00  FREE DISCUSSION (Bldg East 6, Rm525)
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Talks will take place at Bldg East 6, Rm803

13:00-13:30 Farhan Saif (Quaid-i-Azam U)
"Quantum revival in rotational dynamics of molecules in presence of intense laser pulses"
Abstract:
In the seminar I present the quantum recurrence phenomena occurring in higher dimensional systems as a function of time.  In particular the recurrence phenomena in the rotating di-atomic molecule in the presence of intense laser pulses are explained. It is shown that various parameters contribute to the phenomena leading to recurrences at different time scales, which include classical periodicity, quantum revivals, super-revivals and fractional revivals.

13:30-14:00 Kenta Mizuse (Kitasato U/Tokyo Tech)
"Direct imaging of rotational wave packets in molecular clusters and chiral molecules "
Abstract:
Time-resolved Coulomb explosion imaging is a powerful tool for tracking ultrafast, laser-induced molecular dynamics. Over the past several years, we have developed a high-resolution, high-throughput ion imaging apparatus capable of taking high-precision molecular wave packet movies using Coulomb explosion imaging. With this apparatus, we have successfully visualized direction-controlled rotational wave packet dynamics in diatomic molecules. In the present study, we aim to extend our approach to more complex molecular systems, with the goal of exploring the properties and dynamics of these systems through the observed molecular movies. Our targets include weakly-bound molecular clusters and unidirectionally rotating chiral molecules. We will discuss the experimental details and potential applications of wave packet imaging.


14:00-14:30 Hiroka Hasegawa (Nagoya U)
"Asymmetric fragmentation of tetrahedral molecules in phase-locked -2 intense laser fields"
Abstract:
We present the three-dimensional momentum imaging of dissociative ionization and Coulomb explosion processes of tetrahedral molecules, CH4 and CF4 in phase-locked -2 intense laser fields. Both molecules show asymmetric fragmentation with characteristic dependence on the relative phase of the two laser fields, which be discussed in terms of the ionization and dissociation dynamics in -2 intense laser fields.

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14:30-15:00  FREE DISCUSSION (Bldg East 6, Rm803)
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15:00-15:30 Yasushi Shinohara (NTT)
"High-order harmonic generation from crystalline solids, from one-dimensional toy model to three-dimensional quantum dynamical simulations comparing with experimental spectra"
Abstract:
Strong field physics has launched with noble gases exposed to infrared strong laser field mainly with 800 nm wavelength. This field has grown more and more to include more comprehensive materials with a broader light spectrum. Currently, crystalline solids are common material to investigate electron coherent motion driven by strong mid-infrared pulse. One of the significant differences between solids and gases is that complex dispersion depends on the electronic structure of materials. The variety of the electronic structure has the rich potential of the induced quantum dynamics, while more complicated physics is introduced. Firstly, we will introduce examples of solid-state strong field physics from both experimental and theoretical points of view. Then, we will talk about our recent investigation on high-order harmonic generation from crystalline solids.

15:30-16:00 Tomoya Mizuno (U of Tokyo)
"Comparison of photoelectron momentum distributions of Kr and CO2 near a backward rescattering caustic by carrier-envelope phase mapping"
Abstract:
We measure carrier-envelope phase (CEP)-dependent photoelectron momentum distributions (PEMDs) of Kr and CO2 with linearly-polarized sub-two-cycle near-infrared laser pulses. We find that the measured PEMDs for Kr and CO2 have cutoff structures, which are associated with the caustics, with identical decaying pro files. Furthermore, we extract the elastic differential cross sections from the measured PEMDs around the cutoffs based on the adiabatic theory. In the case of a CO2 molecule. we reveal that multicenter and multiple rescattering processes play an essential role in the present momentum range.

16:00-16:30 Mizuho Fushitani (Nagoya U)
"Ultrafast photoelectron spectroscopy of doubly excited states of He in strong NIR laser fields "
Abstract:
We have investigated transient dynamics of doubly excited states (DES) of He converging to He^{+}(N=2) as well as He^{+}(N=3) by using EUV-FEL and NIR laser pulses. Photoelectron spectra of the DES with the ^{1}P symmetry showed several autoionization peaks. Some of these peaks exhibited energy shifts as a function of the time delay between EUV-FEL and NIR laser while others decreased in intensity and showed their sideband signals. These temporal behaviors suggest that the DES with ^{1}P symmetry interacts with dark DES having ^{1}S and/or ^{1}D symmetries by the NIR laser.

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16:30-18:30 FREE DISCUSSION (To be announced)
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Mar 29  (Wed) 2023

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10:00-12:00 FREE DISCUSSION (To be announced)
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Toru Morishita,UEC