Experimental design and methodology for a new Mössbauer scan experiment: Absorption line tracking

A. VEIGA; G. A. PASQUEVICH; P. MENDOZA ZÉLIS; F. H. SÁNCHEZ; M. B. FERNÁNDEZ VAN RAAP; N. MARTINEZ

HYPERFINE INTERACTIONS

springer

Año: 2009 vol. 188 p. 137 - 142

0304-3843

A new experimental setup and methodology that allows the automatic tracking of a Mössbauer absorption line as its energy position varies during the experiment is introduced. The experimental setup consists of a conventional pulse height selection branch, a conventional Mössbauer driving system, and a novel programmable scaler replacing the usual multiscaler. This layout allows the acquisition of partial spectra in energy regions of interest (ROI) using a constant velocity strategy. The scaler can be fully operated by a remote application and data acquisition can be automated. The ROI can be shifted using a versatile and modifiable algorithm hosted in a PC. In this way, an absorption line position can be tracked as a function of an external parameter (temperature, pressure, magnetic field, degree of a solid state reaction advance, etc.) and the evolution of a quantity of interest can be measured. As a test the sixth spectral line of FeSn2 between room temperature and slightly above its Néel temperature was tracked.