Interpreting UV absorption spectra

[nana_yaw]

hello all

i'm investigating the band gap of certain nanocrystallites in the powder form, using a Shimadzu spectrometer with the powder dissolved in ethanol. The spectra, however, come with several peaks in addition to the expected peak for absorption. This is not unexpected as transitions to defects and impurities should arise. What i don't understand is that the literature only reports smooth curves for similar work...!

is it that the other peaks are removed, or a non-linear regression is used to analyze the data?

please help?

nana_yaw

 

[TeethWhitener]

It is very unlikely (and unethical) that researchers would have removed peaks from their data in a publication and not mentioned it. Without seeing the references in question, it is impossible to tell for sure what is happening, but some explanations include: different details of material preparation leading to different properties, selecting spectral windows where the peaks in question do not appear, etc.