The A3Π(1) ← X1Σ+ absorption spectrum of ICl: Rotational analysis of bands in the v″ = 2, 3, 4, 5 progressions (λ > 7000 Å) and a reexamination of published data for individual bands in the v″ = 0, 1, 2 progressions

Molecular constants are reported for the A³Π(1) and X¹Σ⁺ states of I³⁵Cl (0 ≤ v″ ≤ 5, 3 ≤ v′ ≤ 35) and of I³⁷Cl (v″ = 0, 11 ≤ v′ ≤ 32) from least-squares fits to individual bands. The constants are based on analyses of new bands photographed at $\text{λ > 7000}\text{A}\text{?}$ and on data previously reported in the literature. Attention is given to the choice of adequate models. The application of long-range theory to the levels of A³Π(1) near convergence indicates a homogeneous perturbation in addition to the heterogeneous perturbations established in previous work. However, there is no evidence of any discontinuities in the manifold of vibrational levels near v′ = 6 or 9 of the type suggested in previous work.