250 



Walter Gordy 



perpenidcular to //. For an arbitrary orientation of the bond axis with H, 

 the observed ge factor would have the value: 



ge 



V^ii^ cos'^ + g^^^ sin^ 



(19) 



In a sample in which the bond angles have arbitrary orientations in the 

 field H such as would be true in a powder or polycrystalline sample, the 



NO. OF EQUALLY COUPLING 

 HYDROGEN SPINS 



EXPECTED PATTERN OF RESONANCE 



Fig. 2. Types of hyperfine structure predicted for strong-field case for various 

 radicals having ditTerent numbers of equally coupling hydrogens or other nuclei 



of spin |. 



resonance absorption would spread over all values of the field intermediate 

 between that corresponding to the resonance value for g,, and g^^. The ^j^ 

 would apply for any orientation of // in a plane perpendicular to the bond axis, 

 whereas the g,, value would apply only for H along the bond axis. Thus for 

 random orientations in the polycrystalline samples, the g^^ value has the 

 greater weight, and the resonance has an asymmetric form with the highest 



