A motion device for Mössbauer experiments is described consisting of a large moving stage supported on air bearings and driven by a servo-controlled hydraulic piston. The displacement of the table is detected using optical gratings. Velocity stability and reproducibility is within 0.1 % over a range 0.01 to 25 mm s-1.
Bibliographical noteFunding Information:
This work was supported by grants from the R.W. Paul Scientific Instrument Fund of the Royal Soci- ety of London and the Science Research Council. The authors wish to thank Prof. P.B. Moon for his advice and encouragement.