BaF radical: A promising candidate for laser cooling and magneto-optical trapping

doi:10.1088/1674-1056/26/3/033702

Abstract 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 ¹³⁸Ba¹⁹F, as a promising candidate for laser cooling and magneto-optical trapping, is discussed in detail. The highly diagonal Franck-Condon factors between the X²Σ_1/2⁺ and A²Π_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 X²Σ_1/2⁺ state is calculated accurately. A scheme for laser cooling is given clearly. Besides, the Zeeman effects of the upper (A²Π_1/2) and lower (X²Σ_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 A²Π_1/2 is advantageous for magneto-optical trapping. Finally, by studying Stark effect of BaF in the X²Σ_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 BaF is also a promising candidate for precision measurement of electron electric dipole moment.

Keywords: laser cooling magneto-optical trapping BaF radical

Received: 10 November 2016
Revised: 07 December 2016
Accepted manuscript online:

PACS:	37.10.Mn	(Slowing and cooling of molecules)
	37.10.Pq	(Trapping of molecules)
	32.10.Fn	(Fine and hyperfine structure)
	32.60.+i	(Zeeman and Stark effects)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 91536218, 11374100, 10904037, 10974055, 11034002, and 11274114), the National Key Basic Research and Development Program of China (Grant No. 2011CB921602), and the Natural Science Foundation of Shanghai Municipality, China (Grant No. 13ZR1412800).

Corresponding Authors: Jian-Ping Yin
E-mail: jpyin@phy.ecnu.edu.cn

Cite this article:

Liang Xu(许亮), Bin Wei(魏斌), Yong Xia(夏勇), Lian-Zhong Deng(邓联忠), Jian-Ping Yin(印建平) BaF radical: A promising candidate for laser cooling and magneto-optical trapping 2017 Chin. Phys. B 26 033702

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BaF radical: A promising candidate for laser cooling and magneto-optical trapping

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