Extended Data Fig. 2: Impact ionization laboratory spectrum of a polystyrene bead. | Nature

Extended Data Fig. 2: Impact ionization laboratory spectrum of a polystyrene bead.

From: Macromolecular organic compounds from the depths of Enceladus

Extended Data Fig. 2

The figure was modified from figure 5 of ref. 19. The x-axis shows m (mass) over z (cation charge), with z = 1 for all major species. The impact ionization TOF mass spectrum of a polystyrene particle with a radius of ~1 µm was recorded at the Heidelberg dust accelerator facility36 with an impact speed of 5.2 km s−1. Above 100 u and below 70 u the spectrum shows cationic fragments, in good agreement with the CDA HMOC spectra and their characteristic spacing of 12.5 u. The inset shows the molecular structure of the polymer. See the main text and Methods section ‘Inferring the origin of HMOC peaks in CDA spectra’ for further discussion.