Gashyphen;phase electron paramagnetic resonance absorption in nitric oxide. II. The effects of nitrogenhyphen;15 and oxygenhyphen;17 and 18 substitution

摘要

TheXhyphen;band EPR investigation of the six isotopically related molecules of nitric oxide synthesized from14N,15N,16O,17O, and18O has been completed. Perturbation theory applied to Hundrsquo;s case (a) representation for nitric oxide yielded excellent agreement with experiment. Linear relationships were found between thegvalues and the reduced mass, and between the field uncoupling splittings and the reciprocal of the reduced mass, which is indicative of the relationship of these values to the rotational constant,B0. The value of the spin orbit coupling constant was determined to be 123.27 cmminus;1in agreement with the value of James and Thibault (Ref. 7), 123.16plusmn;0.020 cmminus;1. The nitrogenhyphen;15 hyperfine splitting constant was found to be 38.41plusmn;0.19 G. The oxygenhyphen;17 hyperfine lines revealed a measurable quadrupole effect and the oxygenhyphen;17 hyperfine splitting constant was determined to be 57.6plusmn;0.4 G.