At frequencies below 7600 cm –1 the model agrees less well with the data, notably since the data reveal a decreasing trend that is opposite to the increasing trend of the model.
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Emission of Photons by Near-Infrared PbS Quantum Dot Nanocrystals for a Large Diameter Range.
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The sentences
In detail, at low frequency below 7500 cm –1 there is a mild decreasing trend and above 8000 cm –1 a slightly increasing trend, but in view of sample to sample variations and other sources of uncertainty it is not certain that these trends are significant.