Engineering topics

Distefano, T. H.

Publications and source records attributed to Distefano, T. H..

4 records

NASA NTRS1973

Photoemission from CsI - Experiment.

Considerable attention in the investigation was given to the resolution maximization of details in the spectra. Very thin films were used in the measurements, which were conducted at 300 and 77 C with the aid of an improved photoemission apparatus. It was found that the principal features of the photoemission spectra from CsI cannot be explained on the basis of simple transitions from localized ionic states because such a model would predict a doublet instead of the triplet observed in the photoemission data.

Distefano, T. H.↗

NASA NTRS1973

Photoemission from CsI - Calculation.

Calculations of optical and photoemission spectra for CsI based on first-order allowed transitions between Bloch-wave states are discussed. The calculations, utilizing energy-band data for CsI published by Onodera (1968), were performed by computer sampling of regions in the Brillouin zone. The photoelectric spectra of CsI, calculated on the basis of an interpolated band scheme, display features which are in general agreement with the experimentally determined photoelectric energy distribution curves.

Distefano, T. H.↗

NASA NTRS1970

A screened emitter photoelectron analyzer

Photoelectron spectroscopy energy analyzer with spherical retarding field screen, discussing electronic circuit configuration, operational characteristics and spectral resolution

Distefano, T. H.↗

NASA NTRS1970

Energy resolution of the photoemission analyzer

Photoemission analyzer with finite emitter in spherically symmetric retarding field with magnetic field present, analyzing energy resolution

Distefano, T. H.↗