词条 | 多重散射 |
释义 | Multiple scattering Here an electron undergoes more than 20 scattering events as it passes through a specimen. This would only occur on rare occasions, e.g. with very thick or dense specimens. 入射电子射向物质时,会多次受到物质中多个电子或原子核的散射(即多次散射),从而使得入射电子在遭到多次碰撞以后,其在各个方向上的散射概率趋于一致。由于散射截面与原子序数的平方成正比,因而对于轻元素,其散射的概率要小于重元素。 |
随便看 |
百科全书收录4421916条中文百科知识,基本涵盖了大多数领域的百科知识,是一部内容开放、自由的电子版百科全书。