A PROJECTION DIODE TECHNIQUE FOR THERMIONIC EMISSION FROM SINGLE CRYSTALS OF REFRACTORY METALS,

Abstract

An improved electron projection diode with an aluminum-backed fluorescent screen was developed to study thermionic emission from single crystal refractory metal filaments as a function of equilibration. Average thermionic constants phi R and A R may be obtained with the tube operating as a diode; point-by-point thermionic parameters may be obtained by photometric measurements. A modification of the projection diode allows the measurement of the elastically scattered primaries and high energy secondary electrons in a separate tube. Data for recrystallized molybdenum are given. These indicate (a) high work function is always associated with a terraced plateau, which develops on annealing. (b) The deviation of A R from 120 for Mo may be accounted for by patch effect, without recourse to a significant temperature coefficient of work function. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 08, 1964
Accession Number
AD0431332

Entities

People

  • E. Coomes
  • F. Gardner
  • F. Girouard
  • R. Anthony

Organizations

  • University of Notre Dame

Tags

DTIC Thesaurus Topics

  • Coefficients
  • Crystals
  • Electrons
  • Emission
  • Fluorescent Screens
  • High Energy
  • Measurement
  • Metals
  • Molybdenum
  • Refractory Metals
  • Single Crystals
  • Temperature Coefficients
  • Thermionic Emission
  • Work Functions

Fields of Study

  • Physics

Readers

  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Materials Science and Engineering.
  • Surface Engineering/Surface Coating Technology.

Technology Areas

  • Microelectronics