Electronic Spectroscopyof YbNH<sub>2</sub> and thePotential for Laser Cooling
YbNH<sub>2</sub> has been recognized as a suitable platform for observations of parity and time-reversal symmetry violations. Gas phase electronic spectra for YbNH<sub>2</sub> were obtained for the <i>Ã</i><sup>2</sup><i>B</i><sub>2</sub>-<i>X̃</i><sup>2</sup><i>A</i><sub>1</sub> and <i>B̃</i><sup>2</sup><i>B</i><sub>1</sub>-<i>X̃</i><sup>2</sup><i>A</i><sub>1</sub> band systems. Both upper states are derived from the Yb<sup>+</sup>(4f<sup>14</sup>6s)NH<sub>2</sub><sup>–</sup> → Yb<sup>+</sup>(4f<sup>14</sup>6p)NH<sub>2</sub><sup>–</sup> electron promotion. Laser excitation and dispersed fluorescence measurements yielded band origins, vibrational constants and rotational band contours. Data for the <i>Ã</i>-<i>X̃</i> system show a Franck–Condon distribution that is favorable for laser cooling. An upper bound for the vibrational branching fraction for the 0<sub>0</sub><sup>0</sup> transition in emission was found to be 0.94, assuming negligible radiation to the low-energy Yb<sup>+</sup>(4f<sup>13</sup>6s<sup>2</sup>)NH<sub>2</sub><sup>–</sup> states. Quantum chemical calculations for the <i>Ã</i>–<i>X̃</i> vibronic bands are reported.
Publication Details
- Journal
- Figshare
- Published
- 2025-03-25
- DOI
- https://doi.org/10.1021/acs.jpclett.5c00400.s001
- Primary Topic
- Mycorrhizal Fungi and Plant Interactions
- Type
- article
- Field-Weighted Citation Impact
- 0.00