Electronic Spectra of AsO and PO: New Band Systems in the Visible

New band systems were found in the spectra of AsO and PO molecules excited by short-wave oscillations. The new bands of AsO arise from a transition A′²Π_i(a) → X²Π_r, and their band heads can be arranged in a system given by the formula: $\nu =\left\{\begin{array}{c}26480\\ 25145\end{array}\right\}+633.0({\upsilon }^{\prime }+\frac{1}{2})-3.5{({\upsilon }^{\prime }+\frac{1}{2})}^2-966.2({\upsilon }^{\prime }+\frac{1}{2})+4.9{({\upsilon }^{″}+\frac{1}{2})}^2.$ Two new systems F → B and G → B were identified in the spectrum of PO. The term values of the F and G states are about 55585 and 56358 cm⁻¹. New bands were found in the known D → B system which lead to the following constants for the D state $T_e=\left\{\begin{array}{c}48955\\ 48926\end{array}\right\}$ and ω_e′ ≅ 755 cm⁻¹.