An Investigation of Field-Enhanced Evaporation

这项研究旨在继续先前关于交流和直流电场对离子固体中与表面相关的过程的影响的研究。通过对表面附近气体组份的修饰，了解外加电场对蒸发的影响，电场对各种组份表面和表面扩散的杂质偏析的影响，电场与杂质的相互作用，以及电场对成核和生长薄膜的影响。在不同的碱卤化物单晶上，我们将用标准的电子显微镜技术来研究蒸发过程中的场效应；耦合质谱仪也将被用来研究蒸发物质的性质。X射线光电子能谱将被用来研究表面杂质和掺杂在电场效应方面的作用和行为。还将进行一些参数研究，改变场的参数，例如交流场的频率。这项研究涉及到具有技术引进的各种工艺。特别是，这项研究得出的科学认识最终应用于薄膜的生长在电子学和光学领域具有各种重要的潜在应用。

The research is intended to continue previous studies of the effects of AC and DC electric fields on surface related processes in ionic solids. The objective is to understand the effects of external electric fields on evaporation, via modification of the gaseous species near the surface, the effects of electric fields on impurity segregation on the surface and surface diffusion of various species, the interaction of electric fields with impurities, and finally the effects of electric fields on the nucleation and growth films. Field effects on evaporation will be studied by standard electron microscopy techniques on various alkali halide single crystals; coupled mass spectrometry will also be used to study the nature of the evaporating species. X- ray photoelectron spectroscopy will be used to study the role and behavior of impurities and dopants on the surface with respect to electric field effects. Some parametric studies will also be conducted varying the parameters of the fields e.g., frequency of AC fields. This research is relevant to a variety of processes with technological import. In particular, the eventual application of the scientific understanding derived in this study to the growth of thin films has a variety of important potential applications, in the areas of electronics and optics.