Absorption spectra of AsH_2 radical in 435-510 nm by cavity ringdown spectroscopy

摘要

The absorption spectra of jet-cooled AsH_2 radicals were recorded in the wavelength range of 435-510 nm by cavity ringdown spectroscopy. The AsH_2 radicals were produced by pulsed DC discharge in a molecular beam of a mixture of AsH_3, SF_6, and argon. Seven vibronic bands with fine rotational structures have been identified and assigned as the 0_0~0, 2_0~n, and 2_1~n (n = 1-3) bands of the over(A, ～) ~2 A_1 s(-) over(X, ～) ~2 B_1 electronic transition. Based on the previous studies of AsH_2 radical, rotational assignments and rotational term values for each band were obtained, and the molecular parameters including vibrational constants, rotational constants, centrifugal distortion constants, and spin-rotation interaction constants were also determined.