### Abstract

The magnetic tuning of the low rotational levels in the X̃2Σ^{+} (0,0,0), Ã2Π_{r} (0,0,0), and B̃2Σ^{+} (0,0,0) electronic states of strontium hydroxide, SrOH, have been experimentally investigated using high resolution optical field-free and Zeeman spectroscopy of a cold molecular beam sample. The observed Zeeman shifts and splittings are successfully modeled using a traditional effective Hamiltonian approach to account for the interaction between the Ã2Π_{r} and B̃2Σ^{+} states. The determined magnetic g-factors for the X̃2Σ^{+}, Ã2Π_{r}, and B̃2Σ^{+} states are compared to those predicted by perturbation theory. The dispersed fluorescence resulting from laser excitation of rotationally resolved branch features of the 0_{0} ^{0} B̃2Σ^{+}←X̃2Σ^{+}, 0_{0} ^{0} Ã2Π_{3/2}←X̃2Σ^{+} and 0_{0} ^{0} Ã2Π_{1/2}←X̃2Σ^{+} transitions have been recorded and analyzed. The measured fluorescence branching ratios are compared with Franck-Condon calculations. The required bending motion wave functions are derived using a discrete variable representation (DVR) method. Implications for laser slowing and magneto-optical trapping experiments for SrOH are described.

Original language | English (US) |
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Pages (from-to) | 7-18 |

Number of pages | 12 |

Journal | Journal of molecular spectroscopy |

Volume | 347 |

DOIs | |

State | Published - May 2018 |

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### Keywords

- Branching ratios
- Franck-Condon factors
- Strontium hydroxide

### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics
- Spectroscopy
- Physical and Theoretical Chemistry

### Cite this

*Journal of molecular spectroscopy*,

*347*, 7-18. https://doi.org/10.1016/j.jms.2018.02.007