T-violation experiments using Mössbauer transitions

We analyse the effects of time-reversal (T) violation on the transmission of photons through a system of magnetized foils that have a Mössbauer transition with comparableM1 andE2 strength (e. g.⁹⁹Ru or¹⁹⁷Au). We consider experiments that are true tests of T violation and therefore are not subject to effects from final-state interactions, discussing observables that probe either parity-violating or parity-conserving T-odd interactions. We propose a novel three-foil experiment sensitive to a T-odd, P-odd multipole admixture. This experiment should be insensitive to most systematic problems faced by the earlier experiments.