The study of laser cooling of TeH- anion in theoretical approach

摘要

The probabilities of laser cooling of TeH- anion via a spin-forbidden transition and a three-electronic-level transition are proposed. The potential energy curves of the X-1 Sigma(+), a(3)Pi, A(1)Pi, and b(3)Sigma(+) electronic states of tellurium monohydride anion (TeH-) are calculated using multi-reference configuration inter-action method. Davidson corrections, core-valence correlations and spin-orbit coupling effects are also considered. The AWCVSZ-PP pseudopotential basis set of Te atom is used. Spectroscopic parameters of the A-S and Omega states are obtained by solving radial Schrodinger equation. These results are reported at the first time. Permanent dipole moments of the Omega states and transition dipole moments of the a(2)1 <-> X0(+) and A1 <-> X0(+) transitions are also calculated. Highly diagonally distributed Franck-Condon factors of the a(2)1 <-> X0(+) and A1 <-> X0(+) transitions are obtained, the value of f(00) is 0.9970 and 0.9980, respectively. Spontaneous radiative lifetimes of the a(2)1 and A1 excited states are predicted. i.e. tau(a(2)1) = 200.3 ns and tau(Al) = 84.3 ns. Only the main pump laser is required to driving a(2)1 <-> X0(+) and A1 <-> X0(+) transitions. The laser wavelengths both are in the visible region. Doppler temperatures and recoil temperatures of laser cooling TeH- anion are also predicted. (C) 2019 Elsevier B.V. All rights reserved.