A constant-velocity Mossbauer spectrometer with controlled temperature sweep

A. VEIGA; N. MARTÍNEZ; M.A. MAYOSKY; E. SPINELLI; P. MENDOZA ZÉLIS; G. PASQUEVICH; F. H. SÁNCHEZ

REVIEW OF SCIENTIFIC INSTRUMENTS

American Institute of Physics

Año: 2002 vol. 73 p. 3579 - 3583

0034-6748

A constant-velocity Mössbauer spectrometer with controlled temperature sweep of the sample is presented. The equipment was developed for Mössbauer thermal scanning experiments, allowing the determination of the evolution of the magnetic hyperfine field with temperature. It is based in a three level architecture implemented in a medium sized personal computer. The instrument runs the widely used Linux operating system, supporting several custom microprocessor-based boards, extending the hardware capabilities of the PC. This scheme optimizes the required time for the experiment, exploiting in the background the full capabilities of modern multitasking operating systems in terms of networking, graphical user interfaces, and data storage. The prototype was tested applying the method to the simplest case, i.e., a symmetric sextet collapsing into a singlet. It was found that required times are an order of magnitude smaller than those demanded by the conventional methodology. The results obtained for the 57Fe temperature hyperfine field dependence are in good agreement with those obtained by conventional Mössbauer spectroscopy. More complex situations must be explored both experimentally and theoretically. It must be mentioned that the presented layout is actually a general tool for automation of experiments at a relative low cost.