Author/Authors :
Rübsam، نويسنده , , M. and Plüschau، نويسنده , , M. and Schweitzer، نويسنده , , P. and Dinse، نويسنده , , K.-P. and Fuchs، نويسنده , , D. and Rietschel، نويسنده , , H. and Michel، نويسنده , , R.H. and Benz، نويسنده , , M. and Kappes، نويسنده , , M.M.، نويسنده ,
Abstract :
The analysis of a two-dimensional EPR spectrum gives direct evidence for a dominant nuclear quadrupole interaction at the site of the encapsulated La3+ ion. From the observed nuclear spin transition rates we deduce eQVzz/[I(2I − 1)h] ≈ 0.5(3) MHz, assuming that the correlation time of the electric field gradient axes is determined by molecular reorientation of the molecule in solution. The non-vanishing value of the quadrupole interaction is further proof for an off-center position of the metal ion.
