截面（物理）：修订间差异

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 :<math>\sigma = \sigma_\text{A} + \sigma_\text{S} + \sigma_\text{L}.\ </math>
-根据[[比尔－朗伯定律]]，[[吸光度]]与浓度成比例，即<math>A_\lambda  = C \,\ell\, \sigma</math>，其中<math>C</math>是浓度，<math>A_{\lambda}</math>为给定波长<math>\lambda</math>的吸光度，<math>\ell</math>为路径长度，由此总散射面积还与光的[[吸光度]]有关。入射辐射的吸光度是透光率倒数的对数<ref>{{cite book|chapter=2. Spectrophotometry|isbn=8121926335|first=P.K.|last=Bajpai|title=Biological Instrumentation and Biology|url=http://books.google.com/?id=THq-cOPO8RQC&pg=PA14&dq=%22extinction+coefficient%22+transmittance+length+concentration|access-date=2011-08-17|archive-date=2020-02-06|archive-url=https://web.archive.org/web/20200206040712/https://books.google.com/books?id=THq-cOPO8RQC&pg=PA14&dq=%22extinction+coefficient%22+transmittance+length+concentration&hl=en|dead-url=no}}</ref>：
+根据[[比尔－朗伯定律]]，[[吸光度]]与浓度成比例，即<math>A_\lambda  = C \,\ell\, \sigma</math>，其中<math>C</math>是浓度，<math>A_{\lambda}</math>为给定波长<math>\lambda</math>的吸光度，<math>\ell</math>为路径长度，由此总散射面积还与光的[[吸光度]]有关。入射辐射的吸光度是透光率倒数的对数<ref>{{cite book|chapter=2. Spectrophotometry|isbn=8121926335|first=P.K.|last=Bajpai|title=Biological Instrumentation and Biology||access-date=2011-08-17}}</ref>：
 :<math>A_\lambda = - \log \mathcal{T}.\ </math>
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 * [http://www.nndc.bnl.gov/ BNL - National Nuclear Data Center]
 * [http://pdg.lbl.gov/ Particle Data Group - The Review of Particle Physics]
-* [https://web.archive.org/web/20081205024947/http://www.iupac.org/goldbook/R05169.pdf IUPAC Goldbook - Definition: Reaction Cross Section]
+* [http://www.iupac.org/goldbook/R05169.pdf IUPAC Goldbook - Definition: Reaction Cross Section]
-* [https://web.archive.org/web/20070610071830/http://www.iupac.org/goldbook/C01161.pdf IUPAC Goldbook - Definition: Collision Cross Section]
+* [http://www.iupac.org/goldbook/C01161.pdf IUPAC Goldbook - Definition: Collision Cross Section]
 [[Category:原子物理学|C]]