The low-lying electronic states and optical schemes for the laser cooling of the BH+ and BH− ions

The rovibrational levels and spectroscopic parameters of the ground and low-lying excited states of BH+ cation and BH− anion are obtained by ab initio calculations and the laser cooling schemes have been constructed with the 12Σ+ ↔ 12Π transitions of BH+ cation and BH− anion. The predicted cooling temperatures of BH+ cation and BH− anion are 11.20 μK and 0.38 μK, respectively.288