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Figure 5
Microscopic images of a TAAP single crystal with the dimensions 0.28 × 0.13 × 0.06 mm obtained for (a) crossed polarizers (yellow lines indicate the polarization direction of Nicols); for two different angular orientations of the polarizer producing (b) the red colour (ca [110]) and (c) the yellow colour (ca [[\overline{1}]10]) of the crystal, respectively; positions for the crystal illuminated by the light of a UV-LED diode (λex = 410 nm) (yellow lines indicate the analyser direction for fluorescence observation) showing (d) lack of emission and (e) maximum intensity of emission.

IUCrJ
Volume 5| Part 3| May 2018| Pages 335-347
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518001987