Fig. 3
From: Sounding-rocket microgravity experiments on alumina dust
Comparison of IR spectra. These spectra were obtained: a with laboratory measurements on α-Al2O3 embedded in a KBr medium (blue)23; b by observation of AGB stars (khaki)4; c in this study (brown). Calculated spectra of d: spheres at 300 K (black); e faceted particle at 300 K (light blue); f spheres at 928 K (magenta); g spheres with surface contamination of Ta of 5 nm in thickness (purple); h oblate flattened along c-axis with ratio of 0.3 (yellow)
