Gas phase EPR of vibrationally excited O2

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Abstract
The gas phase electron paramagnetic resonance spectrum of vibrationally excited molecular O2 has been obtained using a discharge sampling technique. Measurements of line intensities indicate vibrational temperatures up to 600°K with maintenance of a translational‐rotational equilibrium temperature of 300°K. Analysis of the O2 spectrum allows a determination of the vibrational variation of the ``spin‐spin'' parameter, λv, and the ``spin‐rotation'' parameter, γv. Combination of these values with previous microwave results for the v=0 state of O2 gives much improved values for these parameters at the equilibrium inter‐nuclear distance of O2. Further analysis of these results gives values for the first and second derivatives of the parameters with respect to internuclear distance.

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