INTERACTIONS OF ATOMS AND IONS WITH METAL SURFACES. PART I. THE FORMATION OF HYDROGEN NEGATIVE IONS BY THE BOMBARDMENT OF TUNGSTEN SURFACE WITH HYDROGEN POSITIVE IONS. PART II. THE ANGULAR DISTRIBUTION OF THE ELECTRONS EMITTED FROM A TUNGSTEN SURFACE UNDER POSITIVE ION BOMBARDMENT. Final Technical Report for July 1954-September 1958
The formation of negative hydrogen ions by positive H ion bombardment of W and the angular distribution of electrons emitted from a W surface under positive He ion bombardment were investigated. Apparatus for use in the H negative ion experiment was designed so that electrons from two filaments in the source bombard the region inside the chamber at about 200 volts. The electrons are further guided by two small deflection plates which repel them toward the chamber and aid in focusing. The experimental procedure is described as well as the equipment, diagrams of which are also included. The data are explained in terms of a collision process for the highenergy peak of negative ions, and a process of thermal desorption for low peak of negative ions, coupled with a mechanism for the formation and neutralization of negative ions at a metal surface. In the W surface angular distribution experiments, the surface of the target was bombarded with a well-defined monoenergstic He/sup +/ beam of adjustable energy, and the ejected electrons were analyzed to obtain the angular distribution. Experimental technique and apparatus are described as well as results which are also presented graphically. (J.R.D.)
- Research Organization:
- Syracuse Univ., N.Y. Research Inst.
- DOE Contract Number:
- NONR-313(00)
- NSA Number:
- NSA-13-011972
- OSTI ID:
- 4244628
- Report Number(s):
- NP-7462
- Resource Relation:
- Other Information: Project No. NR 019-610. Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- United States
- Language:
- English
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