方位角

azimuth (azimuthal angle)

[目次：試料室]

電子顕微鏡の場合、鉛直方向に走る光軸を含む面(鉛直面)がその基準となる基準鉛直面となす角。ひらたく言えば光軸まわりの回転角。

In the case of a TEM, the "azimuthal angle" is a rotation angle around the optical axis. That is, an azimuth is defined as an angle between a plane that includes the optical axis and the reference plane also including the optical axis.