Visible and ultraviolet laser spectroscopy of ThF

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Keywords
Abstract
The molecular ion ThF+ is the species to be used in the next generation of search for the electron’s Electric Dipole Moment (eEDM) at JILA. The measurement requires creating molecular ions in the eEDM sensitive state, the rovibronic ground state 3Δ1,v+=0,J+=1. Survey spectroscopy of neutral ThF is required to identify an appropriate intermediate state for a Resonance Enhanced Multi-Photon Ionization (REMPI) scheme that will create ions in the required state. We perform broadband survey spectroscopy (from 13,000 to 44,000 cm−1) of ThF using both Laser Induced Fluorescence (LIF) and 1+1′ REMPI spectroscopy. We observe and assign 345 previously unreported vibronic bands of ThF. We demonstrate 30% efficiency in the production of ThF+ ions in the eEDM sensitive state using the Ω=3/2 [32.85] intermediate state. In addition, we propose a method to increase the aforementioned efficiency to ∼100% by using vibrational autoionization via core-nonpenetrating Rydberg states, and discuss theoretical and experimental challenges. Finally, we also report 83 vibronic bands of an impurity species, ThO.
Year of Publication
2019
Journal Title
Journal of Molecular Spectroscopy
Volume
358
Start Page
1-16
Number of Pages
Date Published
2019-04
Type of Article
ISSN Number
"0022-2852"
URL
http://www.sciencedirect.com/science/article/pii/S0022285219300050
DOI
10.1016/j.jms.2019.02.006
JILA PI
Associated Institutes
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