Polarization-sensitive IR-pump–x-ray-probe spectroscopy

X-ray absorption and core-ionization spectra of molecules pumped by two coherent infrared pulses with different polarizations are studied theoretically. We have found a sensitivity the vibrational profile x-ray probe to IR pulses. This polarization dependence is qualitatively for photoelectron spectra. Measurements this allow select difference in Franck-Condon distributions from lowest levels electronic ground state. The proposed technique exemplified numerically using CO molecule. also show that kind pump-probe spectroscopy can enable studies dynamics molecular rotation.