The Mössbauer effect was one of the last major discoveries in physics and the main concept is a process in which a nucleus emits or absorbs gamma rays without loss of energy to a nuclear recoil. The narrow resonance for nuclear gamma emission and abs...
The Mössbauer effect was one of the last major discoveries in physics and the main concept is a process in which a nucleus emits or absorbs gamma rays without loss of energy to a nuclear recoil. The narrow resonance for nuclear gamma emission and absorption results from the momentum of recoil being delivered to a surrounding crystal lattice rather than to the emitting or absorbing nucleus alone and the depth of resonance is determined by the fraction of recoil-free emissions in the source and the resonant absorption cross section in the absorber. The recoil-free fraction of the source is defined to be the fraction of gamma rays that is emitted without recoil.
Solid-state physics tells us that lattice vibrations are quantized, coming only in packets called phonons. Particular theories provide different spectra of lattice vibrations.
The lattice vibrations of the Fe ion in Ba-ferrite was analyzed by Mössbauer spectra at different angles between the γ-ray direction and c-axis. The vibration on the 2b-site was more active compare to other direction and had very strong intensity in the Raman spectrum.
The Mössbauer effect was one of the last major discoveries in physics and the main concept is a process in which a nucleus emits or absorbs gamma rays without loss of energy to a nuclear recoil. The narrow resonance for nuclear gamma emission and absorption results from the momentum of recoil being delivered to a surrounding crystal lattice rather than to the emitting or absorbing nucleus alone.