TY - JOUR
KW - "Thorium monofluoride
KW - Thorium monoxide
KW - Electron EDM
KW - LIF
KW - REMPI
KW - Core-nonpenetrating Rydberg state
KW - State-selective photoionization"
AU - Yan Zhou
AU - Kia Ng
AU - Lan Cheng
AU - Daniel Gresh
AU - Robert Field
AU - Jun Ye
AU - Eric Cornell
AB - 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.
BT - Journal of Molecular Spectroscopy
DA - 2019-04
DO - 10.1016/j.jms.2019.02.006
M3 - Journal Article
N2 - 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.
PY - 2019
SE - 1-16
SP - 1
EP - 16
T2 - Journal of Molecular Spectroscopy
TI - Visible and ultraviolet laser spectroscopy of ThF
UR - http://www.sciencedirect.com/science/article/pii/S0022285219300050
VL - 358
SN - "0022-2852"
ER -