Na7Li 1 1Π(B) electronic state Λ-doubling analysis

Λ-doubling for a particular vibrational energy level of the Na7Li 1 1Π(B) electronic state is calculated using a simple theory. This 1 1Π(B) state is strongly perturbed by the 3 1Σ+(C) electronic state so that the Λ-doubling constant cannot be obtained by a direct reduction of the difference between e and f levels as a function of J(J + 1). A comparison between experimental data and values obtained in this simple theory shows reasonable agreement.