The microwave spectrum of the dihydronitrosyl radical, H sub 2 NO ( sup 2 B sub 1 )
- Department of Astrophysics, Faculty of Science, Nagoya University, Chikusa 464-01, Japan (JP)
The microwave rotational spectrum of the H{sub 2}NO radical in the {ital {tilde X}} {sup 2}{ital B}{sub 1} ground vibronic state was observed by using a source-modulation spectrometer and a 1 m long free-space cell. The H{sub 2}NO radical was generated in the cell by a reaction of hydroxylamine (NH{sub 2}OH) with the products of 2450 MHz discharge in CF{sub 4}. The spectral lines of H{sub 2}NO were observed for the {ital a}-type {ital R}-branch transitions of {ital N}=1{l arrow}0 to {ital N}=6{l arrow}5, most of which showed resolved hyperfine structures due to the hydrogen and nitrogen nuclei. The 19 molecular constants including the hyperfine coupling constants of both the nuclei were precisely determined by the least-squares fit of 129 observed lines. The observed hyperfine structure shows that the H{sub 2}NO radical in the ground electronic state is essentially planar with {ital C}{sub 2{ital v}} symmetry. The nitrogen hyperfine coupling constants determined indicate that an unpaired electron occupies the {ital p}{sub {pi}} orbital perpendicular to the molecular plane, and the electronic wave function in the ground electronic state belongs to {sup 2}{ital B}{sub 1} symmetry. However, the small but negative inertial defect ({Delta}={minus}0.0051 uA{sup 2} ) suggests a possibility that H{sub 2}NO may have a double-minimum potential function for the out-of-plane vibration.
- OSTI ID:
- 6046447
- Journal Information:
- Journal of Chemical Physics; (USA), Vol. 94:5; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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