干渉（電子の）

interference of electrons

[目次：理論(電子の散乱／回折／結像)]

電子の波動性(波として振舞うこと)によって電子同士が重なって、強め合ったり、弱め合ったりすること。透過電子顕微鏡においては、電子が結晶性の試料に入射すると、試料内のいろいろな原子面によって反射され(ブラッグ反射)、様々な方向に回折波ができる。電顕の像面では、これらがお互いに重なり、位相が合っているところは強めあい、位相が逆さまのところは打ち消しあい縞状あるいは網目状の像を作る。

Interference of electrons occurs due to the wave nature of electrons. When the electron waves are superposed, the amplitudes are added when their phases are the same but are canceled when their phases are opposite. When electrons travel a crystalline specimen, they are reflected by various atomic planes in the specimen (Bragg reflections) and diffracted waves are produced in various directions. When these waves meet on the TEM image plane, the waves constructively interfere where their phases are matched, whereas the waves destructively interfere where their phases are opposite. As a result, a fringe or a net image intensity modulation is formed.

関連用語から探す