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

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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE