Figure 2. Polarized infrared spectra for olivine PA-3. Spectra were taken with different orientations of electric vector E.

Figure 3. Series of polarized infrared spectra for olivine PA-7. Spectra were taken with E parallel to [100] and are presented as a function of lateral position (in mm) parallel to [001] axis.

Figure 2 Polarized infrared spectra of single crystals [2] (X,Z) and [6] (X,Y) of the KHL8306 olivine (Fo91) at 25 °C and −194 °C. Spectra were acquired at 4 and 1 cm −1 resolution at 25 and −194 °C, respectively. (Color online.)

Figure 3 Theoretical polarized infrared spectra of [ ( 4 H ) Si × ( Fe ) M × ] × defects ( left ) where the Fe 2+ sits either in the M1 or M2 site sharing a corner with the Si vacancy. The theoretical infrared spectrum of ( 4 H ) Si

Figure 4 Theoretical polarized infrared spectra of [ ( 2 H ) M 1 × ( Fe ) M × ] × defects ( left ) and structural models ( right ). Fe 2+ sits either in the M1 site sharing an edge with the protonated M1 vacancy or in the M2 site sharing a corner

Figure 5 Theoretical polarized infrared spectra of [ ( Fe , Al , Cr ) M • ( 1 H ) M 1 ′ ] × defects. The bold black line, the thin black line, and the thin gray line represent the relative stability of the defects ( Table 2 ). Vertical dashed

F igure 1. Polarized infrared spectra (E|| a ) of structural OH in rutile at 1 GPa, 500–900 °C, and f O 2 constrained by the NNO buffer.

F igure 1. Polarized infrared spectra of the diopside crystals studied by X-ray diffraction. The water contents shown are derived from the infrared absorbance measured in the respective polarization. Total water contents are obtained by adding up the water contents obtained from polarized

F ig . 10. Polarized infrared spectra of crystals (a) K11 and (b) K9; the direction of the electric vector is shown by the lower-case letter (a, b or c) at the left of each spectrum.

F ig . 11. Polarized infrared spectra of crystals (a) K8 and (b) K22; legend as in Figure 10 .

F igure 3. Representative polarized infrared spectra of natural and experimental olivines. ( a ) Polarized FTIR spectra of experimental olivine AC87 in the 1200–2200 cm −1 region showing the Si-O overtone absorption patterns used to identify the three principal axes [following Lemaire et al

F ig . 6. Polarized infrared spectra of an (H 2 O)-rich region of a randomly oriented doubly polished single crystal of vlasovite after irradiation by X-rays; the minor bands at 2800–3000 cm −1 are due to grease on the crystal). The spectra were collected at 90° rotation of the polarizer.

Figure 16. Representative polarized infrared spectra of OH bands obtained on partially metamict (Gneiss, Mada-gascar) and crystalline (Kaalvallei, South Africa) zircons. Data are from Woodhead et al. (1991a) ; Bell and Rossman (1992) .

Figure 9. Polarized infrared spectra of a water-saturated olivine from an experiment at 8 GPa and 1150 °C (black) and from a natural crystal of olivine from a garnet peridotite (Bull peak diatreme, Arizona). The similarity of the spectra demonstrates that the experiments faithfully reproduce

Figure 10. Averaged polarized infrared spectra of chromian diopside annealed in water at 15 kbar and 1100°C under different oxygen fugacities, corresponding to the Ni-NiO and the Fe-FeO-buffer. Clearly, the band at 3434 cm −1 is very much enhanced under reducing conditions. The relative

Figure 17. Polarized infrared spectra of MgSiO 3 akimotoite containing about 350 ppm of water. From Bolfan-Casanova et al. (2002) .

F igure 2. Polarized infrared spectra of cpx with (a) E // Z (n γ ) and (b) E // X (n α ). The labels correspond to the following samples 1 = Ol-288/74, 2 = U-935, 3 = O-175/87, 4 = U-74, 5 = Zg-25-78, 6 = Tw -140/79, 7 = 2290, 8 = Tw- 297/77, 9 = A-45/2, 10 = TM-8. The spectra

F igure 5. Polarized infrared spectra with (a) E // Z ( n γ ) and (b) E // X ( n α ) taken on different parts on the (010) wafer of cpx sample O-175 with a 5 × 5 μm aperture using synchrotron IR radiation.

F igure 1. Three dimensional plots of polarized infrared spectra between 1300 cm −1 and 5000 cm −1 as functions of wavenumber and 𝛉(𝛉 = the angle between the electric field of the incident radiation E and the refraction index n γ 𝛉 varies from 0 to 180°) for titanite samples

F igure 2. Three dimensional plot of polarized infrared spectra as functions of wavenumber and 𝛉 for titanites annealed at high temperatures: crystalline titanite = No12 ( a ); and radiation damaged titanite = Cardiff ( b ).