Spin–rotation and hyperfine parameters for the (001) excited vibrational state of NO2 from infrared–radiofrequency double resonance

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Abstract
Magnetic–dipole spin–rotation transitions within the ground and v3=1 excited vibrational states of 14N16O2 have been observed by the technique of infrared–radiofrequency double resonance, utilizing near coincidences between CO laser lines and NO2 ν3 band transitions around 6.2 μm. The ground state data contribute to the extensive body of microwave, EPR, and double resonance measurements now available for NO2. The excited state data are the first high resolution measurements within this state, and they are used here to determine a set of spin–rotation and hyperfine interaction parameters for NO2 in the v3=1 state.