1. Sang-Kil Son and Shih-I Chu, “Theoretical study of orientation-dependent multiphoton ionization of polyatomic molecules in intense ultrashort laser fields: A new time-dependent Voronoi-cell finite difference method,” Chem. Phys. 366, 91–102 (2009).
2. Sang-Kil Son, “Voronoi-cell finite difference method for accurate electronic structure calculation of polyatomic molecules on unstructured grids,” J. Comput. Phys. 230, 2160–2173 (2011).
3. Yajiang Hao, Ludger Inhester, Kota Hanasaki, Sang-Kil Son, and Robin Santra, “Efficient electronic structure calculation for molecular ionization dynamics at high x-ray intensity,” Struct. Dyn. 2, 041707 (2015) [special issue on biology with x-ray lasers 2].
4. Ludger Inhester, Kota Hanasaki, Yajiang Hao, Sang-Kil Son, and Robin Santra, “X-ray multiphoton ionization dynamics of a water molecule irradiated by an x-ray free-electron laser pulse,” Phys. Rev. A 94, 023422 (2016).
5. Julia M. Schäfer, Ludger Inhester, Sang-Kil Son, Reinhold F. Fink, and Robin Santra, “Electron and fluorescence spectra of a water molecule irradiated by an x-ray free-electron laser pulse,” Phys. Rev. A 97, 053415 (2018).