I did raman spectra of SiO2 thin film of around 800 nm thickness on grown on Si(100). But i am not clear about the peak of SiO2. Where it is/are actually in the attached file?
When you are talk about SiO2, I believe you mean oxides silicon, i.e. you are
getting some form of amorphous SiO2 (not quartz?).
As far, as I remember, amorphous SiO2 does not show a strong singular "peak", but rather a broader, more unspecific background, as it is not crystalline.
What I can tell from my first look at your spectrum, I think all peaks there are silicon related. There is the TO/LO peak at ~520 from the Brillouin zone center; The structure around 1000 are the LO overtones (2-LO scattering); the two weak peaks around 600 cm^-1 are LA/TO combination bands, while the large structure and its peaks around 300-500 are acoustical overtones (2LA, 2TA) from outside of the Brillouin zone center.
Article Critical-point analysis of the two-phonon Raman spectrum of silicon
See in the above paper, for example.
What I would suggest is taken a spectra before and after oxidation and looking at a difference spectrum to find signs of the SiO2.
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