High-resolution photoelectron spectroscopy of the ground and first excited electronic states of MgKr<sup>+</sup>

Kreis, C.;Holdener, M.;Génévriez, Matthieu;Merkt, F.
(2022) Molecular Physics : an international journal at the interface between chemistry and physics — Vol. 120, n° 2152746, p. 1-19 (2022)

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Authors
  • Kreis, C.Laboratory of Physical Chemistry, ETH Zurich, Zurich, Switzerland
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  • Holdener, M.Laboratory of Physical Chemistry, ETH Zurich, Zurich, Switzerland
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  • Génévriez, Matthieuorcid-logoUCLouvain
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  • Merkt, F.orcid-logoLaboratory of Physical Chemistry, ETH Zurich, Zurich, Switzerland
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Abstract
We report on the characterisation of the lowest three electronic states of MgKr+, the X+ 2+ ground state associated with the Mg+(3s) 2 S1/2 + Kr(4p) 6 1 S0 dissociation limit and the A+ 2 ( = 1/2, 3/2) and B+ 2+ excited states associated with the Mg+(3p) 2 P1/2,3/2 + Kr(4p) 6 1 S0 dissocia- tion limits. The vibrational structure of the X+ ground state was measured by pulsed-field-ionisation zero-kinetic-energy photoelectron spectroscopy starting from the a 30 metastable state of MgKr generated by laser ablation of a Mg rod in a Kr supersonic beam. The vibrational assignment was derived from the isotopic structure of the spectra and the adiabatic ionisation energy of the a → X+ ionising transition was determined to be 38182.4(2.0) cm−1 . Partially rotationally resolved spectra of the A+ ← X+ and B+ ← X+ transitions were recorded by monitoring the yield of Mg+ ions produced by dissociation of MgKr+ using the technique of isolated-core Rydberg-dissociation spectroscopy. Analytical potential-energy functions of the X+, A+, and B+ states were derived using a global model of these states that includes the spin-orbit interaction. The observation of the highest vibrational levels of the B+ state and the onset of the Kr + Mg+(3p) dissociation continuum enabled the precise determination of the dissociation energies of the X+, A+ and B+ states of MgKr+ and of the a state of MgKr. The X+, A+ and B+ states of MgKr+ are important stepping stones to access the Rydberg states of MgKr+ and the ground state of MgKr2+ by resonant multiphoton excitation
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Kreis, C., Holdener, M., Génévriez, M., & Merkt, F. (2022). High-resolution photoelectron spectroscopy of the ground and first excited electronic states of MgKr<sup>+</sup>. Molecular Physics : an international journal at the interface between chemistry and physics, 120(2152746), 1-19. https://doi.org/10.1080/00268976.2022.2152746 (Original work published 2022)