4.6 Article

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

Journal

PHYSICAL REVIEW A
Volume 103, Issue 2, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.103.022829

Keywords

-

Funding

  1. Russian Foundation for Basic Research (RFBR) [19-29-12015]
  2. National Natural Science Foundation of China [11974108, 11574082]
  3. Fundamental Research Funds for the Central Universities [2018MS050]
  4. European Union's Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie Grant [860553]
  5. Carl Tryggers Foundation [CTS18:285]
  6. Helmholtz Virtual Institute [VI419]
  7. Swedish Research Council [VR 2019-03470]

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

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