Observation of Adsorption and Crystal Nucleation by Mass-Spectrometric Techniques
Observation of Adsorption and Crystal Nucleation by Mass-Spectrometric Techniques
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通过质谱技术观察吸附和晶体成核
DOI：
10.1116/1.1492550
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发表时间：
1967
期刊：
影响因子：
--
通讯作者：
J. S. Sandejas
中科院分区：
文献类型：
--
作者：
J. Hudson;J. S. Sandejas
描述了一种实验技术，在该技术中，可以同时测量蒸汽沉积物的成核动力学和某些相关的物理过程，如蒸汽在衬底表面的热适应性和成核剂物种的吸附性质。所描述的技术是基于使用一个小型质谱仪，以监测蒸汽分子的流量离开基板，而吸附或成核过程正在发生。镉蒸气撞击在原子级清洁的钨表面上得到的结果表明形成了两个不同的吸附相。一个主相，服从关系式τa=0.94×10− 10 exp（41100/RT），在干净的衬底最初暴露于蒸汽时形成。在较低的温度下，在主相的顶部形成第二相，其关系式为τa=1.42×10− 10 exp（21200/RT）。晶体成核所需的临界过饱和度的测量表明。吸附层，几个单层
An experimental technique is described in which both the kinetics of nucleation of vapor deposits and certain of the related physical processes, such as the thermal accommodation of vapor at the substrate surface and the adsorptive properties of the nucleant species, can be measured simultaneously. The technique described is based on the use of a small mass spectrometer to monitor the flux of vapor molecules leaving the substrate while adsorption or nucleation processes are taking place. Results obtained for cadmium vapor impinging on an atomically clean tungsten surface indicate the formation of two distinct adsorbed phases. A primary phase, obeying the relation τa=0.94×10−10exp(41100/RT), forms on initial exposure of the clean substrate to the vapor. At lower temperatures a secondary phase, which obeys the relation τa=1.42×10−10exp(21200/RT), forms on top of the primary phase. Measurements of the critical supersaturation required for crystal nucleation indicate. that adsorbed layers, several monolayers ...