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Recently, there have been great interest and advancement in the field of laser cooling and magneto-optical trapping of molecules. The rich internal structure of molecules naturally lends themselves to extensive and exciting applications. In this paper, the radical~(138)Ba~(19) F, as a promising candidate for laser cooling and magneto-optical trapping, is discussed in detail.The highly diagonal Franck–Condon factors between the X~2Σ~+_(1/2)and A~2Π_(1/2) states are first confirmed with three different methods. Afterwards, with the effective Hamiltonian approach and irreducible tensor theory, the hyperfine structure of the X~2Σ~+_(1/2)state is calculated accurately. A scheme for laser cooling is given clearly. Besides, the Zeeman effects of the upper(A~2Π_(1/2)) and lower(X~2Σ~+_(1/2)) levels are also studied, and their respective g factors are obtained under a weak magnetic field.Its large g factor of the upper state A~2Π_(1/2) is advantageous for magneto-optical trapping. Finally, by studying Stark effect of Ba F in the X~2Σ~+_(1/2), we investigate the dependence of the internal effective electric field on the applied electric field. It is suggested that such a laser-cooled Ba F is also a promising candidate for precision measurement of electron electric dipole moment.
Recently, there have been great interest and advancement in the field of laser cooling and magneto-optical trapping of molecules. The rich internal structure of molecules naturally lends themselves to extensive and exciting applications. In this paper, the radical ~ (138) Ba ~ (19) F, as a promising candidate for laser cooling and magneto-optical trapping, is discussed in detail. The highly diagonal Franck-Condon factors between the X ~ 2Σ ~ + _ (1/2) and A ~ 2Π_ (1 / Afterwards, with the effective Hamiltonian approach and irreducible tensor theory, the hyperfine structure of the X ~ 2Σ ~ + _ (1/2) state is calculated accurately. A scheme for laser cooling is Also, the Zeeman effects of the upper (A~2Π_ (1/2)) and lower (X~2Σ ~ + _ (1/2)) levels are also studied, and their respective g factors are obtained under a weak magnetic field. Its large g factor of the upper state A ~ 2Π_ (1/2) is advantageous for magneto-optical trapping. Final ly, by studying Stark effect of Ba F in the X ~ 2Σ ~ + _ (1/2), we investigate the dependence of the internal effective electric field on the applied electric field. It is suggested that such a laser-cooled Ba F is also a promising candidate for precision measurement of electron electric dipole moment.