Fig. 7
From: Small grains from Ryugu: handling and analysis pipeline for infrared synchrotron microspectroscopy
[Left panel] cartoon modeling large grain behavior for infrared measurements on gold; in the bottom panel, the collected signal with respect to a gold background from C0002-FC018, the largest grain in our set (size of approximately 150 µm). The collected signal behaves as expected from a standard reflectance measurement (spectral bands point downward before the Christiansen feature and upward after). [right panel] cartoon modeling large grain behavior for infrared measurements on gold, highlighting the contribution of a double-transmitted beam going through the sample and shining back toward the detector; in the bottom panel, the collected signal with respect to a gold background from C0002-FC026, one the smaller grains in our set (size of approximately 15 µm). The collected signal behaves erratically, with all the bands pointing downwards. The collected signal behaves like a transmission spectrum, even though it has been acquired in a reflectance configuration.