Abstract
Vibrational and rotational analysis of some bands forming a new band system of NS is given. It is also shown that the system involves the ground X2 Π reg. state of the molecule, and is due to the transition2 Π reg.→X2 Π reg. The bands form a singlev″=0 progression withv′=7, 8, 9 and 10. The assignment of these quantum numbersv′, v″ is supported by (1) Δ2F″ (J) values which are identical with those for thev″=0 bands of theβ andγ systems and (2) the isotopic shift data from15NS bands, respectively. The derived vibrational and rotational constants for the new2 Π reg. state are as follows (cm.−1 units): T e ω e ω e x e B e D e 2 Π 3/2.. 30364·8 803·3 3·82 0·6030 2·0×10−6 2 Π ½.. 30292·3 797·0 3·63 0·5898 2·0×10−6
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