THEORETICAL ASPECTS OF DOUBLE-RESONANCE PHENOMENA IN MOSSBAUER-SPECTROSCOPY

We study theoretically radio-frequency/gamma-regime double resonance. In calculating the time dependent Mossbauer absorption Floquet states are used, which incorporate both the rf field and the static splitting of nuclear levels. A novel concise expression results that encompasses all known cases of direct electromagnetic rf excitation. Methods for solving the theory numerically are discussed. Our computer programs are faster and more flexible than the earlier matrix continued fraction programs. A comparison of time averaged and time dependent absorption elucidates the role of transverse and longitudinal rf fields.