Download TM001 - Introduction to Raman spectroscopy

TM012-02-A Data processing and simple analysis
Arithmetic functions on data
A variety of mathematical operations can be performed on single data files. For example, you can
add files together or subtract one from another. It can be an effective method of subtracting a
background spectrum or filter ripple profile.
With a file open, select Processing…Spectral Arithmetic. A new viewer will open, split into three
separate areas. The upper displays the sample spectrum, the middle will show the ‘auxiliary’ data,
i.e. the data file you would like to add/subtract/multiply by/etc., and the lower region will show the
result spectrum. Use the Spectral Arithmetic Properties window to browse for the auxiliary data
and to select the arithmetic function.
It can be useful to multiply either the sample file or the auxiliary file by a factor so that the Y axes
are comparable. In the example below, 1* the sample file has been used and 2* the background
correction file used to remove the baseline. Accept the change either from the context menu or by
closing the window.