The spin-orbit and rotational constants for the N 2 C″ 5Π ui (v=3) state

Abstract

The spin-orbit (A=-16.4 cm-1) and rotational (B=1.017 cm-1) constants for the N2 C″ Π ui 5 (v=3) level are determined by a fit to rotational lines in the C″ Π u 5 - A′ Σ g + 5 (3-1) band that terminate in J Ω′ ′ = 33, 43, 32, and 42 levels of the C″ state. The C″ -state spin-orbit constant is consistent with semi-empirical estimates, based on spin-orbit constants observed in several other electronic states of N2 and the atomic spin-orbit coupling constant, ζ (N 2p). The C″ - A′ bands exhibit the unusual feature of oppositely degraded sub-band heads, Ω′ =3 (red) and Ω′ =1, 0, and -1 (blue). The unusually wide range of BΩeff values, from 0.85 cm-1 (Ω=3) to 1.28 cm-1 (Ω=-1) for C″ Π5 (v=3) should be diagnostically useful for Ω′ -assignments. The C″ Π5 (v=3) level lies 14257.17 and 90599 cm-1 above A′ Σg+5 (v=1) and X Σg+1 (v=0), respectively, and Re (C″ Π5) =1.50 Å. © 2006 American Institute of Physics.