Constant-Velocity Mössbauer Drive Systems
Most Mössbauer effect apparatus currently in use is either of the constant-acceleration or the constant-velocity type. In constant-acceleration equipment the acceleration is a squarewave function of time, and the velocity a symmetric triangular wave, The integral of the velocity over one cycle, the net displacement, must be zero, so that the spectrum is necessarily taken symmetrically about zero velocity. One can, of course, store data only for a portion of the velocity range, but with a corresponding loss of useful counting time. The motion for such a system may be obtained either mechanically or electromechanically; detailed discussions are given elsewhere in this book.
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