RRUFF's Raman spectrum of FeO(OH) as Goethite: enter image description here

Bears no apparent similarity to the extreme Raman scattering of this sample of purported FeOOH under 785nm laser excitation with 100x objective that appears at 50% of 300mW but not at 25%:

enter image description here

What are plausible sources of such extreme shifts in FeO(OH)?

  • $\begingroup$ As the 8000 cm$^{-1}$ shift is so big wrt. any vibration, are you measuring 2nd order spectra. $\endgroup$
    – porphyrin
    Commented Sep 16, 2023 at 15:20
  • $\begingroup$ And third order but only in the Stokes-spectral lines -- not in the anti-Spokes shifts. $\endgroup$ Commented Sep 16, 2023 at 15:50


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