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词汇 Fine Structure Constant
分类 英语词汇 英语翻译词典
释义

Fine Structure Constant

中文百科

精细结构常数 Fine-structure constant

（重定向自Fine Structure Constant）

精细结构常数是物理学中一个重要的无量纲量，常用希腊字母α表示，精细结构指的是原子物理学中原子谱线分裂的样式。其定义为

\alpha = \frac{e^{2}}{4\pi\varepsilon_{0}\hbar c}

或者:\alpha = \frac{e^{2}}{2\varepsilon_{0}hc}

其中：

e是基本电荷
\varepsilon_{0}是真空电容率
\hbar是约化普朗克常数，h是普朗克常数
c是光速

根据2010年CODATA的推荐值，

\alpha=7.2973525698(24)\times 10^{-3}=\frac{1}{137.035999074(44)}

近似计算可以取1/137。

英语百科

Fine-structure constant 精细结构常数

（重定向自Fine Structure Constant）

In physics, the fine-structure constant, also known as Sommerfeld's constant, commonly denoted α (the Greek letter alpha), is a fundamental physical constant characterizing the strength of the electromagnetic interaction between elementary charged particles. It is related to the elementary charge (the electromagnetic coupling constant) e, which characterizes the strength of the coupling of an elementary charged particle with the electromagnetic field, by the formula 4πε0ħcα = e. Being a dimensionless quantity, it has the same numerical value in all systems of units. Arnold Sommerfeld introduced the fine-structure constant in 1916.
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