The new emission spectrum of selenium monoxide in the region 3185-2690 Å

Abstract

The emission spectrum of SeO excited in an electrodeless discharge tube containing selenium dioxide powder by a high power microwave generator revealed the existence of a new band system in the region 3185 - 2690 Å consisting of 48 bands degraded to longer wavelengths. The vibrational analysis suggests that the bands arise from the transition C(³π) - X³∑⁻ (the states designated as C and D in earlier work by Reddy and Azam (1974) are hereafter to be referred to as D and E, respectively). Sub-systems, C(³π₀) - X³∑⁻ (F₂, F₃), C(³π₀) - X³∑⁻ (F₁), C(³π₁) - X³∑⁻ (F₂), C(³π₁) - X³∑⁻ (F₁) and C(³π₂) - X³∑⁻ (F₁) of C-X have been identified. The separations between the band heads having the same vibrational assignments (v', y") with a common upper electronic substate are consistent with the expected value of ∿ 2 λ, λ (= 86.4 cm⁻¹) being the spin-splitting constant of the X³∑⁻ state known from earlier work (Barrow and Deutsch, 1963; Azam and Reddy, 1973). Derived constants (in cm⁻¹) of state C are as follows: -- [special characters omitted] -- In addition, 8 new emission bands of Se0 degraded to longer wavelengths in the region 3040 - 2805 Å have been fitted into the vibrational scheme of the previously known B³∑ - X³∑⁻ system. -- Finally, Morse potential curves have been drawn for several known electronic states of Se0.