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This is one way ?!
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daiqiguang(金币+2):谢谢应助
To my knowledge, this is one way to determine the absorption edge: find the inflection point on the absorption band in the higher wavelength/lower energy region; draw a tangent line at this point and extend all the way to the x axis; the intercept on the x axis is determined as the absorption edge.
In some case, if higher wavelength side is close to a linear fit, some people just find the intercept of this straight line at the x axis.
To a physicist, they would say that we need to figure out what type of charge transfer transition we have. If necessary, the plot should be also converted into Kubelka-Munk unit. A general power law can be then used to determine if the transition is direct or indirect; allowed or forbidden. Anyway, that is really confusing, at least to me.
[ Last edited by hot_cool on 2007-3-23 at 00:38 ] |
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