Figure 2.

Optical microscopy pictures of $\mathsf{\alpha }-{\mathrm{AlH}}_3$. (a,b) are optical microscope pictures of $\mathsf{\alpha }-{\mathrm{AlH}}_3$ at different magnification. Reprinted with permission from Ref. [28]. Copyright 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.