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 Title: Fine And Hyperfine Interactions In 171yboh And 173yboh Author(s): Pilgram, Nickolas H Contributor(s): Steimle, Timothy; Hutzler, Nicholas R; Zeng, Yi; Jadababaie, Arian Subject(s): Mini-symposium: Precision Spectroscopy for Fundamental Physics Abstract: The odd isotopologues of ytterbium monohydroxide, $^{171,173}$YbOH, have been identified as promising molecules in which to measure parity (P) and time reversal (T) violating physics. We report on the prerequisite characterization of the $\tilde{A}^{2}\Pi_{1/2}(0,0,0)-\tilde{X}^2\Sigma^+(0,0,0)$ band near 577 nm for these odd isotopologues. Both laser-induced fluorescence (LIF) excitation spectra of a supersonic molecular beam sample and the absorption spectra of a cryogenic buffer-gas cooled sample were recorded. Additionally, a novel spectroscopic technique based on laser-enhanced chemical synthesis is demonstrated and utilized in the absorption measurements. This technique was critical as it enabled the disentangling of the congested isotopologue structure. An effective Hamiltonian model is used to extract the fine and hyperfine parameters for the $\tilde{A}^{2}\Pi_{1/2}(0,0,0)$ and $\tilde{X}^2\Sigma^+(0,0,0)$ states. A comparison of the determined $\tilde{X}^2\Sigma^+(0,0,0)$ parameters with recently predicted values \footnote{M. Denis et al, J. Chem. Phys. 152, 084303 (2020), K. Gaul and R. Berger, Phys. Rev. A 101, 012508 (2020), J. Liu et al, J. Chem. Phys. 154, 064110 (2021)} is made. The measured hyperfine parameters also provide experimental confirmation of the computational methods used to compute the P,T-violating coupling constants, $W_d$ and $W_M$, theoretical constants needed to correlate the P,T-violating physics to the corresponding P,T-violating energy shifts in the molecule. The dependence of the fine and hyperfine parameters for both the even and odd isotopologues for both the $\tilde{A}^{2}\Pi_{1/2}(0,0,0)$ and $\tilde{X}^2\Sigma^+(0,0,0)$ states for YbOH and isoelectronic YbF are discussed.\footnote{This work was supported by the Heising-Simons Foundation, NSF CAREER, and NIST Precision Measurement Grant} Issue Date: 2021-06-24 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111184 Date Available in IDEALS: 2021-09-24
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