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. 2014 Jun 16;4:5308. doi: 10.1038/srep05308

Figure 2.

Figure 2

(a) Schematic of the experimental set-up for bilayer powders, and (b) Resulting UMARS spectra demonstrating depth sensitive detection of bilayer solid powders 1, 4-Dicyanobenzene (DCB) (TOP) and t-Stilbene (TS) (BOTTOM) packed in glass vial using excitaion at various incident beam locations and by blocking collection fibers at different layers. (i) Beam incident on the top layer DCB, collection only from the top layer, (ii) Beam incident at the interface of the bilayer, collection only from the top layer, (iii) Beam incident at the interface of the bilayer, collection only from the bottom layer TS, and iv) Beam incident on the bottom layer, collection only from the bottom layer TS. Spectral acquisition time 100 s.