Abstract
The vibration–rotational spectrum of the Ar–N2O van der Waals complex has been recorded in the low-frequency stretching mode region of the N2O-monomer (ν1∼1285cm−1). Almost 400 absorption lines were detected using a free supersonic slit-jet expansion in combination with an infrared tunable diode laser spectrometer. The recorded spectrum was assigned to the ν2-band of Ar–N2O. Rotational constants as well as a full set of quartic centrifugal distortion constants are reported. The effective geometrical parameters of this T-shaped complex in the ν2-excited state are calculated and found to be R=3.46(2)Å and θ=82.9(7)°. The band-origin of the spectrum is observed at ν0=1285.11907(14)cm−1 and shows a blue-shift compared to the N2O-monomer spectrum of 0.2158(2)cm−1.
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