When evaluating an alumina sample using Raman spectroscopy, characteristic peaks were obtained for certain wavelengths. However, after depositing a thin nickel film via plasma on the surface of the alumina sample, no peak was observed.
Your observation strongly suggests that the laser wavelength of the incident light (in the Raman spectrometer) lies in the absorption region of the deposited nickel film. Therefore, you will have to change the wavelength to avoid excessive attenuation of the incident light.
Behnam Farid, thanks for your suggestion! I used a green laser (wavelength of 532 nm) to perform the analysis.
Andrey Mello dos Santos : My pleasure. You will have to make a careful literature search, but Figure 3 of [1] (top panel) shows that nickel film shows an onset of strong absorption (particularly at room temperature) at around 532 nm. On the basis on the data in the mentioned figure, you should use somewhat shorter wavelengths for your Raman spectroscopy.
[1] http://www.scirp.org/journal/Paperabs.aspx?PaperID=94748
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