International workshop on theory for attosecond quantum dynamics (IWTAQD) 28

 

co-organized by UECIA


  Jan 24-31at Bldg E6-Rm525 & 803, UEC



back to IWTAQD page

Participants

Chiennan Liu
 		Fu-Jen catholic U
 Strong field Physics theory
 Jan 23-31, 2024
Mizuho Fushitani
 Nagoya U
 FEL experiment
 Jan 24, 2024
Akiyosi Hishikawa
 Nagoya U Molecular tunneling ionization experiment, co-chair
 Jan 24-25, 2024
Yasumasa Hikosaka Toyama U
 FEL/SR experiment Jan 24-25, 2024
Tomoya Mizuno
 Tokyo U
 HHG experiment
 Jan 24, 2024












Hiroka Hasegawa
 UEC
 Molecular dissociation
 Jan 23-31, 2024
Saeed Muhammad UEC Many electron systems Jan 23-31, 2024
Shehroz Khalid UEC Many electron dynamics
 Jan 23-31, 2024
Fredelic Ongonwou
 UEC High-order harmonics
 Jan 23-31, 2024
Takahiro Harima UEC Molecular dynamics Jan 23-31, 2024
Yushi Ishida UEC Molecular rescattering
 Jan 23-31, 2024
Narihisa Tsuzuki UEC
 Molecular ionization
 Jan 23-31, 2024








Yusuke Furukawa UEC Open innovation
 Jan 24, 2024
Shinichi Watanabe
 UEC
 Professor emeritus, International Student Center, Head
 Jan 23-31, 2024
Michio Matsuzawa
 UEC
 Professor emeritus
 Jan 24, 2024








Toru Morishita UEC Chair Jan 23-31, 2024



Workshop Program (tentative)

Jan 24  (Wed) 2023

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12:30-13:30  FREE DISCUSSION (Place: Bldg East 6, Rm803)
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Talks will take place at Bldg East 6, Rm803
(30 min talk + 10 min discussion)
 13:30-14:10 Mizuho Fushitani (Nagoya U)
"Controlling ultrafast autoionization dynamics of He in doubly excited states"
Abstract:
Autoionization processes from doubly excited states (DESs) of He**(N=3, n=3,4) to the N=2 state of He+ were investigated by EUV-NIR photoelectron spectroscopy. Photoelectron spectra of He**(N=3, n=3) pumped by EUV-FEL(hv~70 eV) showed an autoionization peak with a Fano profile. The peak decreased in intensity in the presence of NIR laser pulses(hv = 1.54 eV), producing sideband peaks at energy positions shifted by one-photon energy of the NIR laser pulse. As the NIR intensity increased, however, the autoionization peak on the high energy side exhibited a red-shift while the peak on the low energy side showed no such energy shift. This spectral behavior was identified whether the relative polarization between EUV and NIR laser pulses was parallel or perpendicular. These results suggest that the energy-level shift of the He**(N=3, n=3) state that has the 1P symmetry is driven by laser coupling with the He**(N=3, n=4) state with the 1D symmetry.

14:10-14:50 Chiennan Liu (Fu-Jen catholic U)
"Autoionization in the presence of a strong laser field"
Abstract:
Inspired by a recent experiment, we present a theoretical study to explore the dynamics of doubly resonant ionization in helium involving strong coupling of two doubly excited autoionizing state. More specifically, a singlet P resonance is excited by an intense ultrashort extreme-ultraviolet (EUV) pulse, while a strong infrared pulse, with different degree of temporal overlap with the XUV pulse, couples it to other autoionizing states. We present the photoelectron spectra under the conditions comparable with the experiment are calculated and analyzed.

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14:50-15:10  FREE DISCUSSION (Place: Bldg East 6, Rm803)
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15:10-15:50 Yasumasa Hikosaka  (Toyama U)
"Time-domain interference of atomic processes using longitudinal coherence of synchrotron radiation "
Abstract:
Synchrotron radiation, emitted by relativistic electrons traveling in a magnetic field, has poor temporal coherence, and its use for time-domain interferometry has not been considered. In this talk, I will show that time-domain interferometry experiments on atomic processes can be performed using synchrotron radiation generated by a tandem undulator.

15:50-16:30 Tomoya Mizuno (Tokyo U)
"Ultrafst spectroscopy using high harmonic generation in the range of VUV and soft X-ray"
Abstract:
We report ultrafast spectroscopy using high harmonic generation in the range of VUV and soft X-ray. Using VUV pump and IR probe, we investigate the interatomic excitation energy transfer process of an argon dimer. From the measured pump-probe delay-dependent kinetic-energy release of coincident Ar++Ar+ ions, we conclude that the transfer of energy occurs on a time scale of about 800 fs⁠. We also perform soft X-ray absorption spectroscopy for various molecules, and will show you results of the transient absorption spectroscopy in the water windows.

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16:30-19:00 FREE DISCUSSION (Place: To be announced)
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Jan 25,26,29,30,2023

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9:00-17:00 FREE DISCUSSION (Place: To be announced)
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Toru Morishita,UEC