Extended Data Table 1 The relative abundance of CH2 and CH3 groups in Particles 2, 26, and 33

From: Nitrogen- and oxygen-rich organic material indicative of polymerization in pre-aqueous cryochemistry on Bennu’s parent body

  1. aThe CH2/CH3 ratios in these three particles can be examined using three different approaches after fitting the four bands in the 3000–2820 cm−1 region: (1) ratios from the peak heights of the CH2 and CH3 asymmetric stretching bands, (2) similar ratios from the areas of the same peaks, and (3) after converting the areas of the CH2 and CH3 asymmetric stretching bands into column densities of –CH2– and –CH3 groups, using the average values of the band strengths from ref. 15 of 7.4 × 10−18 and 1.2 × 10−17 cm group−1 for –CH2– and –CH3 groups, respectively.
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