MS-4 Renon (Poland), fully computerized Mössbauer spectrometer is equipped with transducer block control, proportional detector head, nuclear and digital blocks and laser velocity calibrator. The detector head integrates internal pre-amplifier and high voltage supply. The nuclear block contains all the features of γ-ray spectrometer. Four spectra are collected simultaneously: two Mössbauer spectra and amplitude γ-ray spectra collected in the coincidence and anti-coincidence mode with the single channel analyzer window. One of the Mössbauer spectra could be replaced by the laser velocity calibration data. Each of four spectra are collected in 4096 channels having 32-bit capacity each. High precision transducer moves with non-linearity well below 0.1 %. Available velocity ranges vary from about ±0.5 mm/s to about ±150 mm/s.

The system is integrated with IceOxford (UK) liquid helium bath cryostat, with sample in the flowing helium or nitrogen vapor. The sample temperature ranges between 1.5-300K for LHe and 55-300K for LN. The water cooled vacuum furnace from Elektronika Jądrowa (Poland) is used for measurements at elevated temperatures with stability 0.1˚C in the range between ambient temperature and 1100˚C.

Local electronic (oxidation states) as well as structural (electric field gradient) and magnetic properties of solid state samples containing mssbauer isotopes such as iron, tin or europium may be assigned both in gamma-absorption and conversion electrons detection modes. Analysis of the spectra is based on advanced fitting procedures with full hamiltonian of hyperfine interactions both for ‘thin’ and ‘thick’ sample absorbers.

Basic experimental parameters:

Mssbauer isotopes: 57Fe, 119Sn, 151Eu,
velocity range: ±0.5 ÷ ±150 mm/s,
temperature range:  1.5K ÷ 1100K 

Contact person:

dr Jan Żurkowski


    
Mössbauer spectrometer