Resonant Auger decay induced by the symmetry-forbidden 1a1g → 6a1g transition of the SF6 molecule

Resonant Auger electron spectroscopic study at the symmetry-forbidden [Formula: see text] excitation below the S [Formula: see text]-shell threshold of SF[Formula: see text] is reported. Partial electron yield and resonant [Formula: see text] Auger spectra have been measured by using monochromatized undulator synchrotron radiation. By changing the photon energy in small steps, a so-called 2D map is produced. In this map, the dipole-forbidden transition exhibits spectral features (e.g., an S-shaped dispersion relation), which are well known and understood for dipole-allowed transitions. We validate by a theory that for the case of dipole-forbidden transitions, these spectral features can be analyzed in the same way as previously established for the dipole-allowed ones. This approach grants information on the nuclear dynamics in the [Formula: see text]-shell core-excited states of SF[Formula: see text] on the femtosecond (fs) timescale. In particular, for the potential-energy curves of the states S [Formula: see text] and S [Formula: see text], the slopes at the equilibrium distance of the ground state are derived. Symmetry breaking as a result of ultrafast vibronic coupling is revealed by the population of the electronically forbidden excited state.

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Chemical Physics [physics.chem-ph]

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https://hal.science/hal-03797323

Submitted on : Wednesday, October 5, 2022-4:08:17 PM

Last modification on : Thursday, April 11, 2024-1:08:15 PM

Long-term archiving on : Friday, January 6, 2023-7:45:02 PM

Dates and versions

hal-03797323 , version 1 (05-10-2022)

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HAL Id : hal-03797323 , version 1
DOI : 10.1116/6.0001890

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Antonio Santos, Oksana Travnikova, Nacer Boudjemia, Tatiana Marchenko, Renaud Guillemin, et al.. Resonant Auger decay induced by the symmetry-forbidden 1a_1g → 6a_1g transition of the SF₆ molecule. Journal of Vacuum Science & Technology A, 2022, Special Collection: Commemorating the Career of David Arthur Shirley, 40 (4), pp.042801. ⟨10.1116/6.0001890⟩. ⟨hal-03797323⟩

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Resonant Auger decay induced by the symmetry-forbidden 1a_1g → 6a_1g transition of the SF₆ molecule

Abstract