Electronic spectroscopy and ionization potentials for YbOH and YbOCH3

Persinger, Thomas D.; Han, Jiande; Le, Anh T.; Steimle, Timothy C.; Heaven, Michael C.

doi:10.1103/physreva.107.032810

Electronic spectroscopy and ionization potentials for YbOH and YbOCH3

Journal Article · Thu Mar 09 23:00:00 EST 2023 · Physical Review A

DOI:https://doi.org/10.1103/physreva.107.032810· OSTI ID:1960741

^[1]; Han, Jiande ^[2]; Le, Anh T. ^[3]; Steimle, Timothy C. ^[4]; ^[2]

Emory Univ., Atlanta, GA (United States); Emory University
Emory Univ., Atlanta, GA (United States)
Georgia Institute of Technology, Atlanta, GA (United States)
Arizona State Univ., Tempe, AZ (United States)

The polyatomic molecules YbOH and YbOCH₃ have been recognized as being of potential value for spectroscopic experiments that explore charge-parity and time reversal symmetry violation effects. These measurements require very high precision, which, in turn, will necessitate that the molecules be manipulated at ultra-cold temperatures. Both YbOH and YbOCH₃ have electronic transitions that appear suitable for laser cooling ($$\tilde{A}$$²Π_1/2-$$\tilde{X}$$ ²Σ⁺ and $$\tilde{A}$$2E_1/2-$$\tilde{X}$$²A₁, respectively) but the currently available spectroscopic data is not sufficient to determine the extent to which population leaks may compromise the optical cooling processes. A further complication is that the quantum states of interest for these measurements will need to be selectively populated. The $$\tilde{A}$$-$$\tilde{X}$$ band systems of both YbOH and YbOCH₃ show evidence of vibronic perturbations, such that there are unassigned vibronic features at energies that are just above the origin bands. Here, in the present study we have recorded spectra for the $$\tilde{A}$$²Π_1/2-$$\tilde{X}$$²Σ⁺ transition of jet-cooled YbOD to facilitate the vibronic assignments. In addition, spectra for the $$\tilde{B}$$²Σ⁺ - $$\tilde{X}$$²Σ⁺ transition of YbOH were recorded, establishing the origin band at 20473.8 cm^-1. Previously, the reaction of Yb with CH₃OH has been used to generate gas-phase YbOCH₃. As this reaction also yields YbOH, there have been complications in spectroscopic studies of YbOCH₃ due to overlap of the $$\tilde{A} -\tilde{X}$$ band systems. To identify specific regions of overlap, resonantly enhanced two-photon ionization spectra were recorded using mass-resolved detection of the YbOH⁺ and YbOCH₃⁺ ions. These data confirmed the overlap of vibronic bands near 17640 and 17680 cm^-1. Two-photon ionization spectroscopy also provided accurate ionization energies of IE(YbOH)=45788(10) and IE(YbOCH₃)=45283(10) cm^-1. The IE for YbOH is relevant to problems encountered in previous attempts to determine the bond dissociation energy of YbOH⁺.

View Accepted Manuscript (DOE)

Research Organization:: Emory Univ., Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; Heising-Simons Foundation

Grant/Contract Number:: FG02-01ER15153

OSTI ID:: 1960741

Alternate ID(s):: OSTI ID: 1962249

Journal Information:: Physical Review A, Journal Name: Physical Review A Journal Issue: 3 Vol. 107; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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