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

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

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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 nsσg and ndπg autoionizing states of oxygen and negative OD change for ndσg 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.

Original languageEnglish (US)
Article number043427
JournalPhysical Review A
Volume95
Issue number4
DOIs
StatePublished - Apr 26 2017

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optical density
line shape
symmetry
oxygen
electronics
lasers
polarization
pulses
absorption spectroscopy
phase shift
attenuation
absorption spectra
perturbation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Probing autoionizing states of molecular oxygen with XUV transient absorption : Electronic-symmetry-dependent line shapes and laser-induced modifications. / Liao, Chen Ting; Li, Xuan; Haxton, Daniel J.; Rescigno, Thomas N.; Lucchese, Robert R.; McCurdy, C. William; Sandhu, Arvinder Singh.

In: Physical Review A, Vol. 95, No. 4, 043427, 26.04.2017.

Research output: Contribution to journalArticle

Liao, Chen Ting ; Li, Xuan ; Haxton, Daniel J. ; Rescigno, Thomas N. ; Lucchese, Robert R. ; McCurdy, C. William ; Sandhu, Arvinder Singh. / Probing autoionizing states of molecular oxygen with XUV transient absorption : Electronic-symmetry-dependent line shapes and laser-induced modifications. In: Physical Review A. 2017 ; Vol. 95, No. 4.
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