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Table 3 Assignment of the peaks from curve-fitted Raman spectra

From: Water and magmas: insights about the water solution mechanisms in alkali silicate melts from infrared, Raman, and 29Si solid-state NMR spectroscopies

Raman shift, cm−1 Attribution Source
~850 cm−1 νs Si-O in Q 1 Furukawa et al. (1981), Virgo et al. (1980), Mysen et al. (1982), McMillan (1984)
~880–910 cm−1 νs Si-O-H McMillan et al. (1993), Zotov and Keppler (1998), Malfait (2009), Spiekermann et al. (2012)
~960 cm−1 νs Si-O in Q 2 Brawer and White (1975), Brawer and White (1977), Virgo et al. (1980), Furukawa et al. (1981), Mysen et al. (1982), McMillan (1984)
~1020 cm−1 νs Si-BO in Q n Mysen et al. (1982), Spiekermann et al. (2012), Le Losq and Neuville (2013)
~1090 cm−1 νs Si-O in Q 3 Brawer and White (1975), Virgo et al. (1980), Furukawa et al. (1981), Mysen et al. (1982)
~1140 cm−1 νs Si-O in Q 4,II (a) Mysen et al. (1982), Seifert et al. (1982), Mysen (1990), Neuville and Mysen (1996), Le Losq and Neuville (2013), Le Losq et al. (2014)
~1190 cm−1 νs Si-O in Q 4,I (a) Mysen et al. (1982), Seifert et al. (1982), Mysen (1990), Neuville and Mysen (1996), Le Losq and Neuville (2013), Le Losq et al. (2014)
  1. aTwo Gaussians named Q 4,II and Q 4,I are used for fitting the Si-O stretch of Q 4 because of its non-Gaussian shape. See Mysen et al. (1982), Seifert et al. (1982), Neuville and Mysen (1996), and Le Losq and Neuville (2013) for further discussion on this topic. In more depolymerized glasses, the signal of Q 4becomes weak and only one band is needed (see in Fig. 2 the spectrum of KS4 + 17.6 mol % H2O for instance)