Cross sections for reorientation and rotational relaxation of oxygen

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Abstract
Experimental measurements of the collisional EPR linewidths of molecular oxygen are reported for 17 X‐band transitions at resonance magnetic fields up to 0.7 T. In addition to the expected gradual decrease of linewidth with rotational quantum number, a dependence upon orientation quantum number is also observed. The EPR linewidths are comparable to the higher values among the microwave results previously reported for the 60 GHz transitions and substantially larger than the corresponding Raman data.