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We have directly observed a time-dependent recoilless fraction. This effect is seen using delayed-coincidence M\"ossbauer spectroscopy. The time-dependent recoilless fraction is observed at the Fe³⁺ site and not at the Fe²⁺ site in a CoSO₄·{}7H₂O source. The relaxation time of the recoilless fraction is estimated to be between 10 and 100 nsec. Delayed-coincidence M\"ossbauer spectroscopy measurements on sources of CoCl₂·{}6H₂O and Co(NH₄)₂{(S{O}₄)}₂·6{H}₂$O did not show such an effect.
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Hoy et al. (1972) studied this question.
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