Issue 45, 2020

Towards accurate prediction for laser-coolable molecules: relativistic coupled-cluster calculations for yttrium monoxide and prospects for improving its laser cooling efficiencies

Abstract

Benchmark relativistic coupled-cluster calculations for yttrium monoxide (YO) with accurate treatment of relativistic and electron correlation effects are reported. The spin–orbit mixing of 2Π and 2Δ is found to be an order of magnitude smaller than previously reported in the literature. Together with the measurement of the lifetime of the A′2Δ3/2 state, it implies an enhanced capability of a narrow-line cooling scheme to bring YO to sub-recoil temperature. The computed electronic transition properties also support a four-photon scheme to close the leakage of the A2Π1/2 ↔ X2Σ1/2+ cycle through the A′2Δ3/2 state by repumping the A′2Δ3/2 state to the B2Σ1/2+ state, which subsequently decays back to X2Σ1/2+. Relativistic coupled-cluster methods, capable of providing accurate spectroscopic parameters that characterize the local potential curves and hence of providing accurate Franck–Condon factors, appear to be promising candidates for accurate calculation of properties for laser-coolable molecules.

Graphical abstract: Towards accurate prediction for laser-coolable molecules: relativistic coupled-cluster calculations for yttrium monoxide and prospects for improving its laser cooling efficiencies

Supplementary files

Article information

Article type
Paper
Submitted
01 9 2020
Accepted
20 10 2020
First published
05 11 2020

Phys. Chem. Chem. Phys., 2020,22, 26167-26177

Author version available

Towards accurate prediction for laser-coolable molecules: relativistic coupled-cluster calculations for yttrium monoxide and prospects for improving its laser cooling efficiencies

C. Zhang, H. Korslund, Y. Wu, S. Ding and L. Cheng, Phys. Chem. Chem. Phys., 2020, 22, 26167 DOI: 10.1039/D0CP04608F

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