Abstract

Effects of co-axial magnetic and electric fields on time integral PAC have been studied theoretically. Formulae have been developed for the angular shift in the correlation pattern and for the P factor usually measured in a four detector set-up. The formulae have been applied to all the rare earth 3+ ions, for which values of electric and magnetic hyperfine interaction frequencies are calculated at zero temperature. The effect on the angular shift for different values of the lifetime of the excited states has been calculated for use in the interpretation of g-factor measurements at low temperatures. As an example of the temperature dependence of the hyperfine fields and angular shifts, one case was calculated for the temperature region 0-150 K.

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