High-resolution optical spectroscopy with a buffer-gas-cooled beam of BaH molecules

作者：Iwata G Z; McNally R L; Zelevinsky T^*

来源：PHYSICAL REVIEW A, 2017, 96(2): 022509.

DOI：10.1103/PhysRevA.96.022509

Barium monohydride (BaH) is an attractive candidate for extending laser cooling and trapping techniques to diatomic hydrides. The apparatus and high-resolution optical spectroscopy presented here demonstrate progress toward this goal. A cryogenic buffer-gas-cooled molecular beam of BaH was constructed and characterized. Pulsed laser ablation into cryogenic helium buffer gas delivers similar to 1 x 10(10) molecules/sr/pulse in the X-2 Sigma(+)(v '' = 0, N '' = 1) state of primary interest. More than 1 x 10(7) of these molecules per pulse enter the downstream science region with forward velocities below 100 m/s and transverse temperature of 0.1 K. This molecular beam enabled high-resolution optical spectra of BaH in quantum states relevant to laser slowing and cooling. The reported measurements include hyperfine structure and magnetic g factors in the X-2 Sigma(+),B-2 Sigma(+), and A(2) Pi(1/2) states.

• 出版日期2017-8-7