Infrared diode laser spectroscopy of the Kr–N₂O van der Waals complex: the v₁ symmetric stretch region of N₂O

Abstract

The rovibrational spectra of four isotopomers of the Kr–N₂O van der Waals complex, namely ⁸²Kr–N₂O, ⁸³Kr–N₂O, ⁸⁴Kr–N₂O and ⁸⁶Kr–N₂O, were measured in the v ₁ vibrational band region of the N₂O monomer (∼1285 cm⁻¹) using a tunable diode laser spectrometer to probe a pulsed supersonic slit jet. Rotational constants for both ground and excited vibrational states of these four isotopomers were accurately determined. The band-origin of Kr–N₂O was observed to shift by +0.1065 cm⁻¹ from that of the monomer. The band-origin shifts of Rg–N₂O (Rg = Ne, Ar, Kr) in the v ₁ vibrational band region could also be well explained by the model based on a Buckingham intermolecular potential [W.A. Herrebout, H.-B. Qian, H. Yamaguchi and B.J. Howard, J. Mol. Spectrosc. 189, 235 (1998)]. But the band-origin shift of He–N₂O was found to deviate significantly from this model. The possible reason is discussed and the band-origin shift of Xe–N₂O predicted.

Keywords:

• rovibrational spectrum
• Kr–N₂O
• band-origin shift

Acknowledgements

This work has been supported by the National Natural Science Foundation of China (Grant No. 10604019) and self-determined research funds of CCNU from the colleges’ basic research and operation of MOE (Grant No. CCNU09A02012).