Accession Number:
AD0431332
Title:
A PROJECTION DIODE TECHNIQUE FOR THERMIONIC EMISSION FROM SINGLE CRYSTALS OF REFRACTORY METALS,
Descriptive Note:
Corporate Author:
NOTRE DAME UNIV IND
Personal Author(s):
Report Date:
1964-01-08
Pagination or Media Count:
46.0
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