mossbauer effect with temperature

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    I think the hyperfine magnetic field is the same in both cases, because it doesn’t depend on the temperature.

    Depending on the temperature, the nucleus has a certain thermal energy available. If the temperature increases, this thermal energy increases too. If the thermal energy available is higher or like the energy splitting due to the magnetic hyperfine field, the splitting won’t be effective, because without external irradiation, the nucleus will be able to move from one level to another, and then it will behave as a broader energy level instead of different energy levels.

    But if temperature drops, thermal energy of nucleus decreases too. At 50K energy levels start appearing, meaning that thermal energy starts being lower than the splitting energy. Finally, at 18K thermal energy is much lower than the splitting energy of the hyperfine field, and this can be observed easily in the spectrum.

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