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sxy5306

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[求助] absorption edge

各位虫友,通=通过吸收或者透过光谱可以用origin做切线求解bandgaap,但是是做那点的切线呢???细说或者透过图上的那个点如何界定啊?????
下面是一段英文的描述:Where the cut-off edge in   for short wavelength was defined by the point of intersection on the wavelength axis of the linear extrapolation of the rising Urbach exponent. 那么 Urbach 指数公式又是什么呢?
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2楼2012-05-12 11:48:55
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