Table A.1
Integrated absorption coefficients (band strengths) 𝒜 (cm/[group]) of selected IR vibrations identified in the Ryugu samples, with their respective parameters and corresponding literature references.
| Species/Mode | Label |  a (cm−1) |
Wavelength (μm) | 𝒜 (cm/[group])b | int. range (cm−1) | ref |
|---|---|---|---|---|---|---|
| Water | ||||||
| OH stretch | 3400 | 2.94 | 7.7×10−17/OH | 11 | ||
| OH bending | 1640 | 6.10 | 5.5×10−18/OH | 11 | ||
| Organics | ||||||
| CH3 a-stretch | 2960 | 3.38 | 1.2-1.25×10−17/CH3 | 2,3 | ||
| CH2 a-stretch | 2925 | 3.42 | 7.4-8.4×10−18/CH2 2-2.1×10−18/CH3 | 2,3 | ||
| CH3 s-stretch | 2876 | 3.48 | 2,3 | |||
| CH2 s-stretch | 2855 | 3.50 | 2.1-2.4×10−18/CH2 | 2,3 | ||
| Average aliphatic CH band | ≈4.8×10−18/CH | 2,3 | ||||
| C=O str. (ketone) | 1710 | 2.2×10−17/C=O | 3 | |||
| Arom. C=C str. (IOM) | 1600 | 3.2±0.4×10−18/C | 1 | |||
| Arom. C=C str. | 1600 | 3.04×10−18/C c | 4 | |||
| Arom. C=C str. (UCAMM) | 1600 | 1.5±0.5×10−18/C | 5 | |||
| Arom. C=C str. (PAH) | 1600 | 1-2.5×10−19/C | 2 | |||
| Dolomite CaMg(CO3)2 | ||||||
| CO3 a-stretch | ν27-28 | 1442 (1469.8) | 6.93 (6.80) | 1.81×10−16/CO3 | 1700-1200 | 1,6,7 |
| O-C-O out-of-plane def. | ν23 | 880 (884.6) | 11.36(11.30) | 1.67×10−17/CO3 | 940-820 | 1,6,7 |
| O-C-O in-plane def. | ν21-22 | 730 (729.1) | 13.69 (13.72) | 2.92×10−18/CO3 | 780-680 | 1,6,7 |
| Magnesite Mg(CO3) | ||||||
| CO3 a-stretch | ν27-28 | 1444 (1467) | 6.92 (6.82) | 2.35×10−16/CO3 | 1700-1200 | 1,6,7 |
| O-C-O out-of-plane def. | ν23 | 876 (882.3) | 11.42(11.33) | 2.71×10−17/CO3 | 940-820 | 1,6,7 |
| O-C-O in-plane def. | ν21-22 | 748 (747.9) | 13.37 (13.37) | 8.57×10−18/CO3 | 800-690 | 1,6,7 |
| Calcite Ca(CO3) | ||||||
| CO3 a-stretch | v27-28 | 1408 (1440.6) | 7.10 (6.94) | 2.46×10−16/CO3 | 1700-1200 | 1,6,7 |
| O-C-O out-of-plane def. | ν23 | 872 (875.6) | 11.46(11.42) | 1.74×10−17/CO3 | 940-820 | 1,6,7 |
| O-C-O in-plane def. | ν21-22 | 712 (711.7) | 14.05 (14.05) | 2.42×10−18/CO3 | 750-670 | 1,6,7 |
Saponite  |
||||||
| SiO stretch | 1030.1(1045.8) | 9.71(9.56) | 1.40×10−16/Si | 1250-850 | 1,8 | |
Saponite  |
||||||
| SiO stretch | 1024.0(1037.1) | 9.77(9.64) | 1.17×10−16/Si | 1250-850 | 1,9 | |
| Serpentine (Mg2.61Fe0.31)(Si1.80Al0.06)O5(OH)4 | ||||||
| SiO stretch | 980.0(1000.5) | 10.20(9.99) | 1.45×10−16/Si | 1250-850 | 1,8 | |
| Serpentine (Mg2.75Fe0.13)(Si1.85Al0.07)O5(OH)4 | ||||||
| SiO stretch | 950.0(977.3) | 10.53(10.23) | 1.37×10−16/Si | 1250-850 | 1,10 | |
| Serpentine (Mg2.81Fe0.35)(Si1.87Al0.07)O5(OH)4 | ||||||
| SiO stretch | 972.8(1010.2) | 10.28(9.90) | 1.62×10−16/Si | 1250-850 | 1,8 | |
a The first number is the peak maximum position and the number in parenthesis is the average position in the reference samples. The average position is the one that would be observed at very low spectral resolution. The peak positions in the Ryugu samples are very close to the literature positions. b The densities adopted to evaluate the integrated absorption cross sections for the minerals are: dolomite 2.86g/cm3, magnesite 3.01g/cm3, calcite 2.71g/cm3 Anthony et al. (2001) c Assuming the relation 𝒜CH/𝒜CC = 1.578 given in Phan et al. (2021); [1] this work; [2] Dartois etal. (2007); [3] Dartois et al. (2004); [4] Phan et al. (2021); [5] Dartois et al. (2013); [6] Roush (2021); [7] Jiang et al. (2019); [8] Glotch et al. (2007); [9] Roush et al. (1991); [10] Mooney & Knacke (1985); [11] (Bertie & Lan 1996)
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