Download original image
Standardized spectra reveal three signatures (upper part) visible in the Van Krevelen diagram (lower part) with a singular limit for (H/C)at. ratio value of 0.50. Upper this limit (with an unknown (O/C)at. limit value, in blue signals), the Std spectra systematically increase while decrease when lower than 0.50 (red signals). A third signature (orange signals) with increasing and decreasing slope is also evidenced between the region 670–700 nm and corresponds to samples with very low (H/C)at. – (O/C)at. ratio values.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.