Aluminum monochloride (AlCl) has been proposed as an excellent candidate for laser cooling. Here we present absorption spectroscopy measurements on the A1Π←X1Σ+ transition in AlCl inside a cryogenic helium buffer-gas beam cell. The high resolution absorption data enables a rigorous, quantitative comparison with our high-level ab initio calculations of the electronic and rovibronic energies, providing a comprehensive picture of the AlCl quantum structure. Further, the combination of high resolution spectral data and theory permits the evaluation of spectroscopic constants and associated properties, like equilibrium bond length, with an order of magnitude higher precision. Based on the measured molecular equilibrium constants of the A1Π state, we estimate a Franck-Condon factor of the A1Π←X1Σ+ of 99.88%, which confirms that AlCl is amenable to laser cooling.
Daniel, John R., et al. "Spectroscopy on the A<sup>1</sup>Π←X<sup>1</sup>Σ<sup>+</sup> Transition of Buffer-Gas Cooled AlCl." Physical Review A, vol. 104, no. 1, Jul. 2021. https://doi.org/10.1103/physreva.104.012801
Daniel, John R., Wang, Chen, Rodriguez, Kayla, Hemmerling, Boerge, Lewis, Taylor N., Bardeen, Christopher, Teplukhin, Alexander, & Kendrick, Brian Kent (2021). Spectroscopy on the A<sup>1</sup>Π←X<sup>1</sup>Σ<sup>+</sup> Transition of Buffer-Gas Cooled AlCl. Physical Review A, 104(1). https://doi.org/10.1103/physreva.104.012801
Daniel, John R., Wang, Chen, Rodriguez, Kayla, et al., "Spectroscopy on the A<sup>1</sup>Π←X<sup>1</sup>Σ<sup>+</sup> Transition of Buffer-Gas Cooled AlCl," Physical Review A 104, no. 1 (2021), https://doi.org/10.1103/physreva.104.012801
@article{osti_1890984,
author = {Daniel, John R. and Wang, Chen and Rodriguez, Kayla and Hemmerling, Boerge and Lewis, Taylor N. and Bardeen, Christopher and Teplukhin, Alexander and Kendrick, Brian Kent},
title = {Spectroscopy on the A<sup>1</sup>Π←X<sup>1</sup>Σ<sup>+</sup> Transition of Buffer-Gas Cooled AlCl},
annote = {Aluminum monochloride (AlCl) has been proposed as an excellent candidate for laser cooling. Here we present absorption spectroscopy measurements on the A1Π←X1Σ+ transition in AlCl inside a cryogenic helium buffer-gas beam cell. The high resolution absorption data enables a rigorous, quantitative comparison with our high-level ab initio calculations of the electronic and rovibronic energies, providing a comprehensive picture of the AlCl quantum structure. Further, the combination of high resolution spectral data and theory permits the evaluation of spectroscopic constants and associated properties, like equilibrium bond length, with an order of magnitude higher precision. Based on the measured molecular equilibrium constants of the A1Π state, we estimate a Franck-Condon factor of the A1Π←X1Σ+ of 99.88%, which confirms that AlCl is amenable to laser cooling.},
doi = {10.1103/physreva.104.012801},
url = {https://www.osti.gov/biblio/1890984},
journal = {Physical Review A},
issn = {ISSN 2469-9926},
number = {1},
volume = {104},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2021},
month = {07}}
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1890984
Report Number(s):
LA-UR-21-24155
Journal Information:
Physical Review A, Journal Name: Physical Review A Journal Issue: 1 Vol. 104; ISSN 2469-9926