215 citations · 1.1k across the 23 of their papers we have counts for
15 papers · 1 filter
Multiple-core-hole resonance spectroscopy with ultraintense X-ray pulses
Aljoscha Rörig, Sang-Kil Son, Tommaso Mazza +14
Understanding the interaction of intense, femtosecond X-ray pulses with heavy atoms is crucial for gaining insights into the structure and dynamics of matter. One key aspect of non…
Theoretical investigation of orbital alignment of x-ray-ionized atoms in exotic electronic configurations
Laura Budewig, Sang-Kil Son, Robin Santra
We theoretically study orbital alignment in x-ray-ionized atoms and ions, based on improved electronic-structure calculations starting from the Hartree-Fock-Slater model. We employ…
State-resolved ionization dynamics of neon atom induced by x-ray free-electron-laser pulses
Laura Budewig, Sang-Kil Son, Robin Santra
We present a theoretical framework to describe state-resolved ionization dynamics of neon atoms driven by ultraintense x-ray free-electron-laser pulses. In general, x-ray multiphot…
Resonance-enhanced multiphoton ionization in the x-ray regime
Aaron C. LaForge, Sang-Kil Son, Debadarshini Mishra +16
Here, we report on the nonlinear ionization of argon atoms in the short wavelength regime using ultraintense x rays from the European XFEL. After sequential multiphoton ionization,…
Setting the photoelectron clock through molecular alignment
Andrea Trabattoni, Joss Wiese, Umberto De Giovannini +8
The interaction of strong laser fields with matter intrinsically provides powerful tools to image transient dynamics with an extremely high spatiotemporal resolution. Here, we stud…
Interplay between relativistic energy corrections and resonant excitations in x-ray multiphoton ionization dynamics of Xe atoms
Koudai Toyota, Sang-Kil Son, Robin Santra
In this paper, we theoretically study x-ray multiphoton ionization dynamics of heavy atoms taking into account relativistic and resonance effects. When an atom is exposed to an int…
Compton spectra of atoms at high x-ray intensity
Sang-Kil Son, Otfried Geffert, Robin Santra
Compton scattering is the nonresonant inelastic scattering of an x-ray photon by an electron and has been used to probe the electron momentum distribution in gas-phase and condense…
Incoherent x-ray scattering in single molecule imaging
Jan Malte Slowik, Sang-Kil Son, Gopal Dixit +2
Imaging of the structure of single proteins or other biomolecules with atomic resolution would be enormously beneficial to structural biology. X-ray free-electron lasers generate h…
Recombination Amplitude Calculations of Noble Gases, in Length and Acceleration Forms, beyond Strong Field Approximation
Siddharth Bhardwaj, Sang-Kil Son, Kyung-Han Hong +3
Transition of an electron from a free to a bound state is critical in determining the qualitative shape of the spectrum in high-order harmonic generation (HHG), and in tomographic…
Determination of multiwavelength anomalous diffraction coefficients at high x-ray intensity
Sang-Kil Son, Henry N. Chapman, Robin Santra
The high-intensity version of multiwavelength anomalous diffraction (MAD) has a potential for solving the phase problem in femtosecond crystallography with x-ray free-electron lase…
Deep inner-shell multiphoton ionization by intense x-ray free-electron laser pulses
H. Fukuzawa, S. -K. Son, K. Motomura +27
We have investigated multiphoton multiple ionization dynamics of argon and xenon atoms using a new x-ray free electron laser (XFEL) facility, SPring-8 Angstrom Compact free electro…
Monte Carlo calculation of ion, electron, and photon spectra of xenon atoms in x-ray free-electron laser pulses
Sang-Kil Son, Robin Santra
When atoms and molecules are irradiated by an x-ray free-electron laser (XFEL), they are highly ionized via a sequence of one-photon ionization and relaxation processes. To describ…
Enhanced nonlinear response of Ne to intense ultrafast x rays
Arina Sytcheva, Stefan Pabst, Sang-Kil Son +1
We investigate the possible reasons for the discrepancy between the theoretical two-photon ionization cross section, , of Ne obtained w…
Multi-wavelength anomalous diffraction at high x-ray intensity
Sang-Kil Son, Henry N. Chapman, Robin Santra
The multi-wavelength anomalous diffraction (MAD) method is used to determine phase information in x-ray crystallography by employing dispersion corrections from heavy atoms on cohe…
Impact of hollow-atom formation on coherent x-ray scattering at high intensity
Sang-Kil Son, Linda Young, Robin Santra
X-ray free-electron lasers (FELs) are promising tools for structural determination of macromolecules via coherent x-ray scattering. During ultrashort and ultraintense x-ray pulses…