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    STUDIA PHYSICA - Issue no. 1 / 2002  
         
  Article:   EPR AND ENDOR INVESTIGATION ON A GAMMA-IRRADIATED.

Authors:  VASILE CHIŞ, A.L. MANIERO, M. BRUSTOLON, O. COZAR, L. DAVID. 		 
       
         
  Abstract:  X-band cw-EPR and ENDOR spectroscopies are used to investigate the tyrosyl radical produced in a gamma-irradiated single crystal of L-Tyrosine-hydrochloride, at room temperature. The radical, formed by hydrogen abstraction from the hydroxyl group attached to the aromatic ring of the Tyrosine molecule is found to exists in two slightly different conformations. Both of them are very close to the original position of the parent molecule in the crystal. Six hyperfine coupling tensors have been obtained by usual first order analysis of the ENDOR frequencies, three for each conformation of the radical in the host crystal. One of the -methylene proton coupling is used to derive the conformation of the CH2 group with respect to the aromatic ring of the radical.  
         
     
         
         
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