Rovibrational spectrum of the Ne–N 2O van der Waals complex in the 1285 cm −1 region

Abstract

The rovibrational spectrum of the Ne–N 2O van der Waals complex has been recorded in the symmetric stretching mode region of the N 2O monomer (∼1285 cm −1) using a tunable diode laser spectrometer in conjunction with an astigmatic multi-pass cell and a pulsed supersonic slit jet. The spectra of both 20Ne–N 2O and 22Ne–N 2O isotopomers are assigned and analyzed using a Watson S-reduced asymmetric-rotor Hamiltonian. The rotational and centrifugal constants for the excited vibrational state are accurately determined. The band-origin of the spectrum is determined to be ν 0 = 1285.12251(18) cm −1 for 20Ne–N 2O and 1285.12363(27) cm −1 for 22Ne–N 2O, which shows a blue-shift of 0.21921 cm −1 for 20Ne–N 2O and 0.22033 cm −1 for 22Ne–N 2O from that of the N 2O monomer, respectively.