A Mossbauer spectrometer consists of four fundamental components: a source, a sample, a detector, and a motor to move the source or absorber. This is often accomplished by moving the source toward and distant from the specimen while adjusting velocity linearly. Moving the source at 1 mm/sec toward the sample, for example, raises the energy of the emitted photons by around ten natural line widths. In Mossbauer spectroscopy, the standard “energy” unit is “mm/sec.” It is also feasible, like with synchrotron Mossbauer, to leave the source fixed and pulsate the specimen.