Determination of the Interaction Potential and Rovibrational Structure of the Ground Electronic State of MgAr⁺ Using PFI-ZEKE Photoelectron Spectroscopy
(2019) The Journal of Physical Chemistry A — Vol. 124, n° 2, p. 379-385 (2019)
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Wehrli, Dominik 
- Abstract
- The interaction potential characterizing the ground electronic state of MgAr+ has been determined from the photoelectron spectrum recorded from the a 3Π0 metastable state of MgAr at high resolution by pulsed-field-ionization zerokinetic- energy (PFI-ZEKE) photoelectron spectroscopy. The photoelectron spectrum provides information on the first ten vibrational levels of MgAr+ and leads to the determination of the adiabatic ionization energy of metastable MgAr (38 742.3(20) cm−1), the ground state dissociation energy of MgAr+ (1254(60) cm−1), and to the characterization of the rovibrational photoionization dynamics of MgAr. 1. INTRODUCTION Molecular complexes involving rare gases and positively charged alkali and alkaline-earth metal atoms serve as model systems to study fundamental aspects of chemical binding mechanisms, solvation, metal−ligand interactions, and the interactions of atoms at metal surfaces.1,2 Considerable effort has therefore been invested in the past 25 years to characterize molecules of the type M+·Rg (M+ = Be+, Mg+, Ca+, etc. and Rg = He, Ne, Ar, Kr, etc.) in spectroscopic and mass-spectrometric experiments and through ab initio quantum-chemical calculations (see refs 1, 2 and references therein). Initial interest in the properties of MgAr+ can be traced to the first observation of the photoionization spectrum of MgAr by Massick and Breckenridge3 and of the electronic spectrum of MgAr+ by Duncan and coworkers. 4−7 Both MgAr and MgAr+ are easily formed and entrained in
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Wehrli, D., Génévriez, M., Kreis, C., Agner, J. A., & Merkt, F. (2019). Determination of the Interaction Potential and Rovibrational Structure of the Ground Electronic State of MgAr⁺ Using PFI-ZEKE Photoelectron Spectroscopy. The Journal of Physical Chemistry A, 124(2), 379-385. https://doi.org/10.1021/acs.jpca.9b10435 (Original work published 2019)