Applications

Systems for Mössbauer Spectroscopy

Janis has a number of proven designs available for Mössbauer spectroscopy. These systems have been integrated with Mössbauer spectrometers from Science Engineering and Education Co. (SEE Co.) - formerly WEB Research Co. - with excellent results. The line broadening due to vibrations has been measured at <1%, even in mechanically cooled systems.

Mechanical coolers come with a special vibration isolation stand for easy integration into the laboratory. No independent mounting stands need to be constructed in the laboratory – the as-shipped configuration is ready for operation.

All designs have the sample located in exchange gas or flowing vapor for uniform sample cooling. Powder samples, or other samples that are difficult to thermally anchor, are evenly cooled because the system does not rely on the thermal conductivity of the sample for cooling. This approach has the added advantage of fast sample exchange.

Existing designs include:

  1. 5 K closed cycle refrigerator systems with vibration isolation stand. 
  2. 12 K closed cycle refrigerator systems with vibration isolation stand. 
  3. Reservoir cryostat with the sample located in flowing vapor. 
  4. Mössbauer vacuum furnace (Model VF-100, pictured below).

Contact Janis today for details of how our systems can be integrated into your laboratory.

VF-100 Mossbauer Spectroscopy Vacuum Furnace, Janis Research

Click to enlarge photo

Model VF-100 Mössbauer Vacuum Furnace 

Click image to enlarge view of Moessbauer spectra of a 25 micro iron metal foil at 298 K with the closed cycle refrigerator off and on. Shown to the right (click image to enlarge) are Fe57 Mössbauer spectra (dots) of a 25 micron iron metal foil at 298 K with the CCR off and on. The velocity scan of ± 2 mm/s covers only the innermost lines of the iron metal sextet. Also shown are least squares fits (lines) of a symmetric quadrupole pair with Lorentzian line shapes to each spectrum. The results of the fits were linewidth estimates of 0.234 mm/s with the CCR off and 0.241 mm/s with the CCR on. The uncertainty in the line width estimates due to the counting statistics is ± 0.002 mm/s.

NOTE: Data provided by Science Engineering & Education Co. (SEE Co. - formerly Web Research Co.), http://www.seeco.us. Special thanks to Professor Darby Dyar, Mount Holyoke College.

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