The calculation of the interaction energies of the b'1Σ+uand c'1Σ+ustates of15N2

Abstract

Recent results of deperturbation calculations relating to the interaction of the b' and c' Σ+u states of 14N2 have been modified to render them applicable to 15N2. Molecular constants obtained by the method of matrix optimisation have been scaled by the use of standard isotopic formulae, and vibrational wavefunctions have been derived by the solution of the appropriate Schrodinger equations. The diagonal and off-diagonal (i.e. electronic interaction) matrix elements have been computed and the resulting vibronic matrix diagonalised. A sample comparison with observed data on fifteen of the lower 1Σ+u levels shows good agreement between theory and experiment. It is proposed that J-dependent calculations be carried out and used in the interpretation of high-resolution spectra of the far-ultraviolet spectrum of 15N2.