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The odd isotopologues of ytterbium monohydroxide, $^{171,173}$YbOH, have beenidentified as promising molecules in which to measure parity (P) and timereversal (T) violating physics. Here we characterize the$\tilde{A}^{2}\Pi_{1/2}(0,0,0)-\tilde{X}^2\Sigma^+(0,0,0)$ band near 577 nm forthese odd isotopologues. Both laser-induced fluorescence (LIF) excitationspectra of a supersonic molecular beam sample and absorption spectra of acryogenic buffer-gas cooled sample were recorded. Additionally, a novelspectroscopic technique based on laser-enhanced chemical reactions isdemonstrated and utilized in the absorption measurements. This technique isespecially powerful for disentangling congested spectra. An effectiveHamiltonian 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. Acomparison of the determined $\tilde{X}^2\Sigma^+(0,0,0)$ hyperfine parameterswith recently predicted values (M. Denis, et al., J. Chem. Phys. $\bf{152}$,084303 (2020), K. Gaul and R. Berger, Phys. Rev. A $\bf{101}$, 012508 (2020),J. Liu et al., J. Chem. Phys. $\bf{154}$, 064110 (2021)) is made. The measuredhyperfine parameters provide experimental confirmation of the computationalmethods used to compute the P,T-violating coupling constants $W_d$ and $W_M$,which correlate P,T-violating physics to P,T-violating energy shifts in themolecule. The dependence of the fine and hyperfine parameters of the$\tilde{A}^{2}\Pi_{1/2}(0,0,0)$ and $\tilde{X}^2\Sigma^+(0,0,0)$ states for allisotopologues of YbOH are discussed and a comparison to isoelectronic YbF ismade.

Fine and hyperfine interactions in $^{171}$YbOH and $^{173}$YbOH