Characterizing the Fundamental Bending Vibration of a Linear Polyatomic Molecule for Symmetry Violation Searches

• DOI: 10.48550/arxiv.2301.04124
• Publication Date: 2023-01-01
• Authors: Arian Jadbabaie; Yuiki Takahashi; Nickolas Pilgram; Chandler J. Conn; Yi Zeng; Chi Zhang; Nicholas R. Hutzler
• Keywords: Polyatomic ion

Polyatomic molecules have been identified as sensitive probes of charge-parity violating and parity-violating physics beyond the Standard Model (BSM). For example, many linear triatomic are both laser-coolable parity doublets in ground electronic $\tilde{X} {}^2Σ^+ (010)$ state arising from bending vibration, features that can greatly aid BSM searches. Understanding is a crucial prerequisite to precision measurements with polyatomic molecules. Here, we characterize fundamental vibration ${}^{174}$YbOH using high-resolution optical spectroscopy on nominally forbidden (010) \rightarrow \tilde{A} {}^2Π_{1/2} (000)$ transition at 588 nm. We assign 39 transitions originating lowest rotational levels state, accurately model state's structure an effective Hamiltonian best-fit parameters. Additionally, perform Stark Zeeman fit molecule-frame dipole moment $D_\mathrm{mol}=2.16(1)$ D electron $g$-factor $g_S=2.07(2)$. Further, use empirical explain observed anomalous line intensities terms interference spin-orbit vibronic perturbations excited $\tilde{A} state. Our work essential step toward searches for YbOH other