I am using Spectragryph V1.2.15 to visualize FTIR Spectra. But it is showing values in "nm" on x-axis. When i chose the "wavenumber(1/cm)" instead of "nm", it changes the range to 16000-25000. Please suggest where can be the problem?
How about trying to export the data, convert the units of the x-axis manually, and redraw it.
regards
Ziyuan Lau I tried it, but it also changed the range on x-axis (16k-24k).
If you recorded a spectrum in the range 600-4000nm, the expectable wavenumber range would be 2.5k-16k. Is 25k really the end you get in your display? Can you show us the plot you get from your software?
Alternatively: did you actually record 600-4000cm-1 and the software just displays a bogus unit on the axis? In that case I suppose you need to check the import; if that doesn't work, go brute force and put on a different axis label with a different software. If you do that, just be sure you know what you did experimentally.
Jürgen Weippert I am sure about the software. But I think I recorded the data in form of nm. So is it possible to discuss the results in this way? As in research articles, everyone discussed the functional groups based on the wavenumber.
And if I change my data from nm to 1/cm, then yes the range is 2.5k-16k, but this range does not give the identification of correlated functional groups.
Well, OK then, if you have actually recorded this range, then discussing it in nanometers is OK, since this goes into the visible range which is usually labelled like that.
Out of curiosity: why did you choose this particular range? Many characteristic features are at higher wavelengths/lower wavenumbers.
What about directly asking the expert on this software (me), who developen it and answers a couple of requests every day? You could even use the Researchgate messaging tool...
Well, here is the explanation: on loading a spectrum file, the software tries to find axis type information from inside the file. If nothing is found, it will use default types, which can be set and changed from File > Options. After first installation, these are "Wavelength (nm)" and "Absorbance", which explains the shown axis label. On switching the display axis type from wavelength to wavenumbers, the spectral data gets transformed accordingly, it is NOT just a change of axis label. So, you need to introduce your data correctly into the software in the first run...
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