Left panel: infrared spectra of the mechanochemically produced interstellar analogues, baseline subtracted. The colours correspond to different milling materials (stainless steel: red; hardened steel: blue; tungsten carbide: green; zirconium oxide: cyan). Infrared spectra of potential main contaminant for long-duration milling times are shown for clarity: iron oxide nanoparticles (Fe3O4 spectrum from Can et al. 2010) for stainless steel and hardened steel and tungsten oxide (WO3 spectrum from Dawson et al. 2011), expected to be marginal due to its high shear resistance, for tungsten carbide. The thin lines indicate the estimated position of the peak maximum for the broad massif. The nomenclature refers to the description in Table 2. Right panels: astronomical observations for comparison to the analogue spectra. Top: near-infrared literature spectra available for four out of all the analysed sources. Bottom: mid-infrared Spitzer and ISO spectra of class and type sources analysed. For the spectra including both near and mir spectra, a combination of analogue spectra are overlaid for comparison.
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