I was trying to Analyze Gold electrode quality by Raman. But the problem is I often having some peak like in the picture. which I am unable to define. even I am having this kind of picture in others materials too. and I also found same peak while I am doing raman with no laser. green laser was used and filter was medium, grating 1800.
Did I get it right that you measure the signal without having the laser in operation? If yes, that would mean that you probably detect some background noise signal. What about the instrumentation?
Kind regards
Peter
Try to reduce any light sources in the lab. Apparently things like fluorescents may have a contribution like that to your spectrum. It would be useful to know the wavelength of those peaks instead of the shift (know the reference laser the system though you were measuring with even if it was off).
This is an example of a fluorescent spectra, but we need the wavelength to know if it fits. (Source http://www.bealecorner.org/best/measure/cf-spectrum/)
Thanks to everyone.
Mr.. Peter wagner - If it is background noise then my question will be- why I am having same peak position while doing raman with laser?
Mr. John Brindle and Julia Gala - I always do the Raman in the dark room. Do you know for pure gold where should I get the peak in Raman? waiting for your reply?
Hi Saleh. I have the same question as you. Not sure where the peak should be. I'm using 785nm laser and getting a peak around 1400.
When you do not have any photons generated by Raman activity at these wavelengths you will certainly detect photons generated by another "source" as background noise, even with laser turned on. What is the laser wavelength?
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