Accession Number : AD0717709

Title :   Electron Fluorescence in Some Polymeric Solids.

Descriptive Note : Technical rept. Nov 68-Jan 69,

Corporate Author : AIR FORCE WEAPONS LAB KIRTLAND AFB N MEX

Personal Author(s) : Straw,David C. ; Payton,Daniel N. , III

Report Date : JAN 1971

Pagination or Media Count : 29

Abstract : The fluorescence of several polymeric solids exposed to short, intense pulses of electrons has been investigated. Nylon, polytetrafluorethylene, and polyethylene have been studied by using high-speed streak photography. The streak photograph yields a spatial and temporal record of the energy absorption profile. Total base lifetimes of the strong fluorescence varied from 42 to 50 x 10 to the -9th second corresponding closely to the pulse width of the incident electron beam. A typical decay curve for these materials is displayed showing time constants as short as 10 to the -8th second. A spatially narrow region of strong fluorescence which appears near the incident surface of the sample has been identified as being excited by primary electron absorption. The depth of this primary electron absorption is dependent upon the energy profile of the incident electron beam and the detailed buildup of space charge effects. (Author)

Descriptors :   (*POLYMERS, *ELECTRON IRRADIATION), (*NYLON, ELECTRON IRRADIATION), (*POLYETHYLENE PLASTICS, ELECTRON IRRADIATION), FLUORESCENCE, HIGH SPEED PHOTOGRAPHY

Subject Categories : Physical Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE