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The effect of an applied linear electric field on the electron paramagnetic resonance spectrum of Mn2+ (3d5 : 6S) in La2Mg,(N0,),,.24H20 has been observed by the electron spin echo technique combined with a pulsed electric field. The result is expressed as a shift in the zero-field splitting parameter D which is given by AD,,&E, = 2.8 f 0 3 kHz per kV cm-', where E, is the external electric field. A theoretical interpretation of this shift has been made in the limit of ionic bonding working in a relativistic scheme and taking into account configuration interaction between the 3d5 ground configuration and the excited configurations 3d4n'l' (1' = 1,3; n' = 4, . . . ,8) and 3p53d6. The calculated value of this shiR is one fifth of the observed value. Possible reasons for this discrepancy are discussed.

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