Chemical assessment of the explosive chamber in the projector system of Hayabusa2 for asteroid sampling

Table 1 Tentative peak assignments for the IR and Raman spectra based on Socrates (2004)

Wavenumber/cm⁻¹	Functional groups
IR
~3400	O–H, N–H
1830*	NOX (X = halogen), carbonate
1640**	H₂O, C=C, C=O (amide I)
1520-10**	C=C, NH₃⁺, N–H (amide II)
1420-10**	CO₂⁻, NH₄⁺, NO₃⁻, C–N (amide III), CO₃²⁻ (carbonate)
1100*	C–O, S=O
1000*	S=O
940**	N–O
860*	NO₃⁻, carbonate
Raman
123	Unknown
157–167	Carbonate
202	Carbonate
235	Unknown
278	C–Cl, aromatic, carbonate
553–573	C–Cl, aromatic, amide, C=O, C–S
726	C–Cl, aromatic, amide, C–S, carbonate
1095	NO₃⁻, aromatic, C–O, C–N, S=O, carbonate
1475–1490	NH₃⁺, aromatic, pyrrole, carbonate
1729	C=O

The IR peaks with * are distributed in the right area, and the peaks with ** are distributed in the IR map (Fig. 10). Since IR spectroscopy is bulk analysis and it does not detect trace components. Although aliphatic C–H peaks were not detected by IR, aromatic species may exist (1640 and 1520–10 cm⁻¹ could be aromatic C=C)