Raman Thermometer

[Luc]

Considering the noise level in the spectrum shown, I would say that the approximation of ~5°C is not that far from reality.

I really have to take a moment to read that paper to get a better understanding of the experiment!

[NaHBrO]

I have looked at another raman scattering experiment for the students. The used a sample of sulfur powder to get the temperature measurement. They then fitted a gaussian to the peaks and read their intensity off those. I have tried to get a raman spectrum of sulfur (I am aware that there is an OpenRAMAN powder analyzing cuvette, however I did not see anything that would justify it over simply using the normal cuvette holder) and I got this spectrum. As you can see there is a tall peak in the stokes region and one smaller but visible in the antistokes region. If I use the local minima of the behind the stokes peak as a baiseline and I got -1,88 °C for this sample. Does anybody have an idea on how to better take fluorecence into account? Or how to avoid it alltogether?

[Luc]

The generic background correction method is not ideal for quantitative work.

The easiest is to export the raw spectrum in csv and, using Matlab or excel, remove a slanted line at the base of the peak. It works very well for isolated sharp peaks but it's more tricky for broader peaks.