Observation of Interference Effects in the Mössbauer Absorption Spectra ofE2andE2M1Transitions

In a transmission geometry, dispersion terms were observed in the shapes of the Mössbauer resonance lines of pure $E2\mathrm{}$ and mixed $\frac{E2\mathrm{}}{M1\mathrm{}}$ transitions. For the pure $E2\mathrm{}$ transitions studied, the relative magnitude of these terms, which are attributable to interference effects, is typically 1.5% of the depth of the absorption line. We discuss possible consequences of the resulting asymmetric line shape for isomer-shift measurements.