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如何计算禁带宽度？
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已经知道了UV-VIS全波长的扫描图谱 按照文献讲的，是用 这里吸收峰的起始点是什么意思呢？ 作吸收起始点的切线，然后交于x轴为λ 吸收起始点是怎么确定的？ 搜了好多资料，都没有详细的描述 紧急求助~~ 谢谢各位大人~~ [ Last edited by nxl5096224 on 2009-1-27 at 18:55 ] |
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This is one way ?!
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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 ] |
14楼2007-03-23 00:36:24
sawm
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