High-resolution study of the ν1 + ν2 and ν2 + ν3 strongly interacting bands of D 2Se

Abstract

A high-resolution Fourier transform spectrum of the D 2 M Se species ( M = 82, 80, 78, 77, and 76) in the region 2300–2500 cm −1 was recorded for the first time and assigned. On the basis of these experimental data, rotation–vibration energies of the (1 1 0) and (0 1 1) vibrational states were fitted, and band centers, and rotational, centrifugal distortion, and resonance interaction parameters were determined for the main D 2 80Se species. The obtained set of 32 fitted parameters reproduces the 647 rotation–vibration energies with a rms deviation of 0.00024 cm −1. The ν 1 + ν 2 and ν 2 + ν 3 bands of the other four isotopic species are analyzed as well.