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Branching Ratios, Radiative Lifetimes and Transition Dipole Moments for YbOH

Mengesha, Ephriem Tadesse and Le, Anh T. and Steimle, Timothy C. and Cheng, Lan and Zhang, Chaoqun and Augenbraun, Benjamin L. and Lasner, Zack and Doyle, John (2020) Branching Ratios, Radiative Lifetimes and Transition Dipole Moments for YbOH. Journal of Physical Chemistry A, 124 (16). pp. 3135-3148. ISSN 1089-5639. doi:10.1021/acs.jpca.0c00850.

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Medium resolution (Δν~ 3 GHz) laser-induced fluorescence (LIF) excitation spectra of a rotationally cold sample of YbOH in the 17300-17950 cm⁻¹ range have been recorded using two-dimensional (excitation and dispersed fluorescence) spectroscopy. High resolution (Δλ~ 0.65 nm) dispersed laser induced fluorescence (DLIF) spectra and radiative decay curves of numerous bands detected in the medium resolution LIF excitation spectra were recorded. The vibronic energy levels of the X²Σ state were predicted using a discrete variable representation approach and compared with observations. The radiative decay curves were analyzed to produce fluorescence lifetimes. DLIF spectra resulting from high resolution (Δν < 10 MHz) LIF excitation of individual low-rotational lines in the A²Π_(1/2)(000)-X²Σ((000), A²Π_(1/2)(100)-X²Σ((000), and [17.73]Ω=0.5-X²Σ((000) bands were also recorded. The DLIF spectra were analyzed to determine branching ratios which were combined with radiative lifetimes to obtain transition dipole moments. The implications for laser cooling and trapping of YbOH are discussed.

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Additional Information:© 2020 American Chemical Society. Received: January 30, 2020; Revised: March 30, 2020; Published: March 31, 2020. The research at Arizona State University was supported by a grant from the Heising-Simons Foundation (Grant 2018-0681). The authors thank Prof. Michael Morse (Chemistry Department. University of Utah) for the use of a cw-dye laser system and Prof. Nicholas Hutzler (Division of Physics, Mathematics, and Astronomy, California Institute of Technology) for his insightful comments. The authors declare no competing financial interest.
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Heising-Simons Foundation2018-0681
Issue or Number:16
Record Number:CaltechAUTHORS:20200401-072009675
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Official Citation:Branching Ratios, Radiative Lifetimes, and Transition Dipole Moments for YbOH. Ephriem Tadesse Mengesha, Anh T. Le, Timothy C. Steimle, Lan Cheng, Chaoqun Zhang, Benjamin L. Augenbraun, Zack Lasner, and John Doyle. The Journal of Physical Chemistry A 2020 124 (16), 3135-3148; DOI: 10.1021/acs.jpca.0c00850
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102213
Deposited By: Tony Diaz
Deposited On:01 Apr 2020 15:29
Last Modified:16 Nov 2021 18:09

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