Probing autoionizing states of molecular oxygen with XUV transient absorption: Electronic-symmetry-dependent line shapes and laser-induced modifications
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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.
author list (cited authors)
Liao, C., Li, X., Haxton, D. J., Rescigno, T. N., Lucchese, R. R., McCurdy, C. W., & Sandhu, A.
complete list of authors
Liao, Chen-Ting||Li, Xuan||Haxton, Daniel J||Rescigno, Thomas N||Lucchese, Robert R||McCurdy, C William||Sandhu, Arvinder