The vibrational and hyperfine spectroscopy toward laser cooling 87Sr35Cl

We theoretically investigate the possibility of laser cooling (SrCl)-Sr-87-Cl-35 molecule in accordance with vibrational and hyperfine spectroscopy. The potential energy curves and dipole moment of the X-2 Sigma(+)(1/2), A(2)Pi(1/2),(3/2) and B-2 Sigma(+) states are calculated using ab initio method and the spectroscopic parameters are in good agreement with the experimental data. On account of the accurate potential energy curves and the transition dipole moment, the Franck - Condon factors and radiative lifetimes are predicted. Comparing the conditions of laser cooling candidate molecules, the A(2)Pi (1/2) <-> X-2 Sigma(+)(1/2) transition is selected as the laser cooling cycle system. In order to obtain an approximately closed cooling cycle system, we employed matrix element algorithm to calculated the hyperfine spectroscopy and branching ratios of the (SrCl)-Sr-87-Cl-35 molecule. Furthermore, an electro-optical modulator (EOM) is designed including six hyperfine levels of the ground state X-2 Sigma(+)(1/2) (v = 0, N = 1).

Automated summary

We theoretically investigate the possibility of laser cooling (SrCl)-Sr-87-Cl-35 molecule using vibrational and hyperfine spectroscopy. The potential energy curves and dipole moment are calculated, and the Franck - Condon factors and radiative lifetimes are predicted. The A(2)Pi(1/2) <-> X-2 Sigma(+)(1/2) transition is selected as the laser cooling cycle system, and the hyperfine spectroscopy and branching ratios are calculated.