摘要:

The diffusion of charged particles in the presence of a radial inverse‐square electric field is difficult to treat in any general manner. It is possible, however, to treat steady‐state radially symmetric flow in such a field. There may then be deduced, from the radial distributions obtained, a function, &ggr;, which provides an important description of steady‐state flow from a point source in the radial field. The important point is made that the function &ggr; obeys the differential equation adjoint to that describing time‐independent diffusion in the given field.The physical problem treated is of specific interest to transistor theory, but it is hoped that some of the techniques used in treating the problem are of more general interest.

ISSN:0021-8979    

DOI:10.1063/1.1721185

出版商:AIP    

年代:1953

数据来源: AIP

摘要:

A special method is introduced for quantitatively determining the metal‐evaporation mechanism using metallic gold and chromium tagged with pile‐produced Au198and Cr51. This tracer method provides a powerful tool for the study of the distribution of minute amounts of the evaporated metal. Propagation and deposition of the vaporized metal are analyzed under a variety of conditions both in the normal evaporation process and for shadow‐casting conditions. It is shown that crucible size and shape determine the evaporation‐dispersion pattern. Computation of film thickness is by quantitative tracer methods with correlating observations by electron microscopy. Structure of these metal films correlates with observations by an earlier worker [R. W. G. Wyckoff, PSA Journal13, 12 (1947)]. The probable error of the method is ±2 percent.

ISSN:0021-8979    

DOI:10.1063/1.1721186

出版商:AIP    

年代:1953

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1721187

出版商:AIP    

年代:1953

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1721189

出版商:AIP    

年代:1953

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1721191

出版商:AIP    

年代:1953

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1721192

出版商:AIP    

年代:1953

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1721193

出版商:AIP    

年代:1953

数据来源: AIP