Far-infrared laser magnetic resonance spectrum of the AsH radical in X3Σ −

Abstract

The far-infrared laser magnetic resonance spectrum of AsH in the ground X 3Σ − state has been observed using five optically pumped laser lines as sources. The AsH radical was produced by the reaction of metallic arsenic with microwave discharge products of a H 2 and O 2 mixture. From an analysis of the observed spectrum, the following rotational and fine structure constants were obtained: B 0 = 215 877.54 (23), D 0 = 9.834 (11), λ = 1 763 488 (56), and γ = −8 114.5 (60), all in MHz with 3σ in parentheses. The hyperfine coupling constants were also determined for the two nuclei as follows: α As = −11.5 (14), β As = −159.4 (13), eQq As = −97.6 (72), α H =−49.80 (66), and β H =4.15 (60), again in MHz with 3σ in parentheses.