PFI-ZEKE CHARACTERIZATION OF THE GROUND AND LOW-LYING EXITED STATES OF MgO⁺

Schmitz, Joel R

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https://hdl.handle.net/2142/122626 Copy

Description

Title

PFI-ZEKE CHARACTERIZATION OF THE GROUND AND LOW-LYING EXITED STATES OF MgO⁺

Author(s)

Schmitz, Joel R

Contributor(s)

• Merkt, Frédéric
• Kreis, Carla

Issue Date

2023-06-20

Keyword(s)

• Electronic structure
• potential energy surfaces

Abstract

We report on the characterization of the rovibrational structure of the ground and first excited electronic states of MgO⁺ by high-resolution pulsed-field ionization zero-kinetic-energy (PFI-ZEKE) photoelectron spectroscopy. Rotationally cold (Trot=5 K) MgO molecules in the X¹Σ⁺ (v = 0-2) levels are generated in a supersonic expansion of a 0.1% N₂O/He carrier gas following laser ablation off an magnesium (Mg) rod[1]. The rovibrational ionization thresholds corresponding to both spin-orbit components (Ω= 1/2, 3/2) of the X⁺ ²ΠΩ (v⁺ = 0-10) states and to the lowest vibrational levels of the A⁺ ²Σ 1/2⁺ state are reached in a resonant 1+1′ two-photon excitation sequence via the F¹Π, E¹Σ⁺, and G¹Π rovibrational intermediate levels of MgO studied previously by Breckenridge and coworkers [2]. Our new results include accurate values for the adiabatic ionization energy of MgO and for the dissociation energies of the MgO X ¹Σ⁺ and MgO⁺ X⁺ ²Π 1/2 states. This work is carried out in the context of our studies of the rovibrational structure of doubly charge dications by high-resolution PFI-ZEKE spectroscopy of singly charged cations following a similar approach as recently taken to characterize the ground state of the thermodynamically stable dication MgAr²⁺ [3]. The talk will present a roadmap towards characterizing the ground state of MgO²⁺ by resonant multiphoton excitation via electronically excited states of MgO⁺. The experiments will reveal whether MgO²⁺ is stable as predicted in Ref. [5].

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122626

DOI

https://doi.org/10.15278/isms.2023.7140

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