Probing autoionizing states of molecular oxygen with XUV transient absorption: Electronic-symmetry-dependent line shapes and laser-induced modifications Academic Article uri icon


  • 2017 American Physical Society. We used extreme ultraviolet (XUV) transient absorption spectroscopy to study the autoionizing Rydberg states of oxygen in an electronically- and vibrationally-resolved fashion. XUV pulse initiates molecular polarization and near-infrared pulse perturbs its evolution. Transient absorption spectra show positive optical-density (OD) change in the case of nsg and ndg autoionizing states of oxygen and negative OD change for ndg states. Multiconfiguration time-dependent Hartree-Fock (MCTDHF) calculations are used to simulate the transient absorption and the resulting spectra and temporal evolution agree with experimental observations. We model the effect of near-infrared perturbation on molecular polarization and find that the laser-induced phase-shift model agrees with the experimental and MCTDHF results, while the laser-induced attenuation model does not. We relate the electronic-state-symmetry-dependent sign of the OD change to the Fano parameters of the static absorption line shapes.

published proceedings


altmetric score

  • 0.25

author list (cited authors)

  • Liao, C., Li, X., Haxton, D. J., Rescigno, T. N., Lucchese, R. R., McCurdy, C. W., & Sandhu, A.

citation count

  • 28

complete list of authors

  • Liao, Chen-Ting||Li, Xuan||Haxton, Daniel J||Rescigno, Thomas N||Lucchese, Robert R||McCurdy, C William||Sandhu, Arvinder

publication date

  • April 2017