Ultra-Violet Band System of Strontium Oxide (SrO)

Abstract

THE investigations hitherto made have shown that three band systems belong with certainty to the strontium oxide molecule (SrO); the first of these is situated in the infra-red, the second in the blue and the third in the ultra-violet region. Mahanti made vibrational analyses of the blue and ultra-violet systems¹. A vibrational and rotational analysis of the infra-red system, a ¹Σ – ¹Σ transition, was communicated by us in 1949². This analysis shows that the vibrational frequencies of the lower ¹Σ state coincide extremely well with those of the lower state of the blue system. Thus for ¹Σ we found ω″_e = 653.4₉ and x″_eω″_e = 4.0₀, as compared with 653.4₇ and 4.0₂ for the lower state of the blue system. In our paper we mentioned this agreement and assumed that the infra-red and blue systems have the same lower state. Recently, Budó and Kovács have privately communicated to us that they have made a successful rotational analysis of the blue bands. The transition is ¹Π – ¹Σ, where the lower state is the same as for the infra-red bands.