In the below attached image, absorption of a sample is increasing from 850 nm and it is continuously increasing upto 200 nm. But my doubt is that where the exact absorption edge is? i need to consider it at 800 nm or somewhere around 450 nm?
Dear, Abhinay Sreeram
The intersection of the extrapolated spectrum with the abscissa gives the gap wavelength
Then, you can use Tauc's formula to obtain the optical energy gap value
This was discussed in details in the attached file
My advise: there is no (a.u.) for one spectrum on y-axis. This is valid for one graph contains several spectra
With my best wishes
Yours,
M.A. Morsi
From the point of view of the interpretation of an absorption spectrum, the maximum has to be determined from the absorption coefficient (or the proportional magnitude absorbance) as a function of energy (or the proportional magnitude wavenumber).
Dear colleague Abhinay Sreeram,
Have a nice time and good day.
the absorption edge is illustrated through the attached file (red color)
.
I wish this is useful and help you.
Best wishes
Yours
A. EL-Denglawey
Once you have drawn the spectrum as a function of the wavenumber, and obtained a first guess of the maximum, you may fit the peak by a Gaussian function. This procedure will lead you to the features of the peak. To do this, you may use Origin, for example. The program will do it automatically.
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