7th International Conference on Attosecond Science and Technology

Session

Transient absorption and XUV spectroscopy of atoms and molecules

3 Jul 2019, 08:30

University of Szeged Congress Centre

319. XUV Excited-State Dynamics of a Two-Electron System in Strong Fields

Christian Ott (Max-Planck-Institut für Kernphysik)

03/07/2019, 08:30

invited talks

The correlated electron dynamics of doubly excited states in helium can be controlled with strong fields, state resolved via transient absorption spectroscopy. Nonlinear absorption spectroscopy with intense XUV FEL pulses gives access to phase shifts due to dressed-state dynamics.

70. Direct Imaging of Curve-crossing Dynamics in IBr by Attosecond Transient Absorption Spectroscopy

Yuki Kobayashi (UC Berkeley)

03/07/2019, 09:00

oral

We perform attosecond transient absorption spectroscopy (8-fs-visible pump, 200-as-XUV probe) to measure nonadiabatic dynamics of iodine monobromide. The results visualize the switching of unoccupied-orbital character from $\sigma^{*}$ to $\pi/\pi^{*}$ ensuing at the avoided crossing.

61. Transient Absorption Ion Spectroscopy with XUV-FEL Pulses

Thomas Ding (Max-Planck-Institut für Kernphysik)

03/07/2019, 09:15

oral

We investigate transient (2.4-fs time scale) coherence effects imprinted on the electronic level structure of the doubly-charged neon ion caused by the nonlinear interaction with intense extreme-ultraviolet free-electron-laser radiation under the influence of its stochastic time structure.

195. Attosecond Transient Absorption of Molecular Core-excited States: Core-hole Lifetime Dependence on Orbital Alignment Relative to Molecular Bond

Dr Hugo Marroux (UC Berkeley)

03/07/2019, 09:30

oral

Using attosecond transient absorption (ATAS), core-excited state lifetimes of iodine monochloride are retrieved, with additional detail about the orientation of the core excited state orbital relative to the bond direction.

206. Soft X-Ray Attosecond Spectroscopy at an FEL: Molecular Photoionization and Auger Emission Dynamics

Elio Champenois (SLAC National Accelerator Laboratory)

03/07/2019, 09:45

oral

Using high pulse energy soft X-ray attosecond pulses, we investigate ultrafast molecular photoionization and Auger emission dynamics near and beyond the O $K$-edge of NO via angular streaking with a co-linear velocity map imaging spectrometer.

9. Extracting Dynamics from the HHG Spectra of Polyatomic Molecules

Jon Marangos (Imperial College London)

03/07/2019, 10:00

oral

The ultrafast evolution of a molecule following ionisation in a strong laser field is a central problem in attosecond science. Here we extend the method of high harmonic generation spectroscopy (HHGS) to extracting these dynamics in a way that is robust and general.