Hello, i want to characterize Lead chalcogenide nanoparticles (PbS NPs) using Raman Spectroscopy. I would like to know what should be the wavelength of Laser in that Raman spectrometer for characterization.
Since in Raman spectroscopy , virtual state are involved so the laser should not be absorbed. If you have an absorption spectrum of your material, check the absorption peaks and then choose laser wavelength. Typically 514nm (green laser) is used for such materials.
Dear Talha Nisar , I disagree. Because the band gapof PbS is extremely small (
It sounds like you will be doing resonance Raman. Probably have a spectrum that will be dependent on the laser wavelength (like graphene). Any of the common visible to near-IR lasers will be fine, I suspect. Take a UV-vis spectra to see if you have a visible absorbance due to nanoparticle size (?). Maybe try to avoid a laser wavelength in that absorption band. Otherwise try it!
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