Why don't you show your Raman spectra with negative intensities.

Dear Lady! This sounds strange. I guess that the definition of the zero line and the background correction are incorrect. What excitation source and spike filters (?) do you use? Are the ranges of "negative Intensity" peak-like or broad with step-like changes? And, of course, what is the target of your experiments? Have you other strong electro-magnetic sources in the lab enviroment? Wkr, M. Herms.

Hi. I that It is required your setup or any experimental arrangement that you have used to be shown here.

best regards

Hi! Thanks for your responses. Here is one spectrum I have collected.

I will add all the other information that you request as soon as Im back at the lab (which is within a couple of days).

Hi all. Ok, Ive identified some of the problems. The spectra are not negative if I only use 400 cm-1 at the time, i.e., if I do not use extended range. So there is probably something with the averaging of all spectra, I guess.