Concept of spinning magnetic field at magic-angle condition for line narrowing in Mssbauer spectroscopy
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A different technique for narrowing of Mssbauer resonances in crystals is suggested. Similar to high-resolution nuclear magnetic resonance spectroscopy, it uses a combined action of a continuous wave radio-frequency field and a dc magnetic field under a "magic-angle" condition. However, the condition itself is essentially different from the one known previously. Moreover, this technique suppresses the contribution of the dipole-dipole interaction to the energy of Mssbauer transition only (it does not suppress the contribution of the dipole-dipole interaction to the energy of individual levels). It works rather well even in the case of relatively strong dipole-dipole interaction. 2007 The American Physical Society.