How can I find the absorption edge in the UV-Vis absorption spectrum?

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Himamaheswara Rao Vemula

Dear Ali Thanks for your response. Yes I have only one peak. but I need to clarify how to derivative the spectrum?

F. Caballero-Briones

Could you share your spectra? You are measuring films, solutions? You are trying to find the absorption edge of what material?

Dear Caballero-Briones, I am doing on glass samples.

Hemalatha ks

According to my knowledge, It is a position from where absorption starts decreasing. If we could draw a linear line from this point joining the Wavelenth on x-axis such that absorption is zero. the absorption edge wavelength could be obtained.