Ventacon Wotton Limited   FOURIER TRANSFORM   RAMAN CELLS
Designed and optimised exclusively for Fourier Transform Raman Spectrometers

	HOT CELLS - SERIES H
Series H-1 Hot Cell

Ventacon Hot Cell Systems provide users with the ability to heat solid, liquid or semi solid samples to elevated temperatures and to control the temperature of the sample precisely. It is not possible to raise temperatures to an unlimited extent. All hot samples emit ‘black-body’ radiation and do so more and more as the temperature increases. The emission follows a well characterised profile whose maximum decreases in wavelength with increasing temperature. As a consequence, FT Raman users see a background whose intensity rises to increasing wavenumber shifts and the problem becomes dramatically worse as the temperature increases. It is therefore not feasible to measure complete spectra much above 180°C. (See Higher Temperature section  below).

Three cells operating to 180°C are offered by Ventacon and all fit into the standard 3" x 2" Raman sample slideways#. The Model H-1 is a cell designed to examine powders or lumps of sample. The material is pressed into a 3mm diameter stainless steel cavity and compressed with a cylindrical piston. Powders or solids should, if possible, be pressed to measure 1-3mm in depth. If the sample is very thin the spectrum will be weak.

# For Nicolet instruments a special adaptor is required. For Bruker instruments a special fitting is supplied and the 3" x 2" slideways are not used.

If constraints on sample size necessitate that specimens will be thinner than 1mm it is recommended that an alternative micro cell – the Model H-2 be considered. The Model H-2 has a sample tube with the diameter of only 1.5mm and hence the sample depth of a specimen available in only a small amount, can be maximised. Obviously, it is more difficult to optically align the H-2 cell than its larger equivalent.

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