N a parallel beam of molecules that are at low pressure and suffer no interatomic or intermolecular collisions 分子束 [physics]
This paper gives a short cut method to derive from molecular speed distribution function in the molecular ray.
给出了导得分子射线中分子速率分布函数的一种简捷方法。
The calculations show that equilibrium distribution of the molecules in the source of molecular ray is not influenced as only a few molecules effuse from an enough small hole.
研究表明，在小孔足够小时，少量分子的逸出对分子射线源中气体分子平衡分布的影响几乎可以忽略。
The program includes use of X-ray diffraction, electron microscopy, and other techniques for testing materials on the molecular level.
其中还涉及X射线衍射、电子显微镜及其他仪器的使用，以检测材料的分子结构。
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