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Contribution of electronically excited states to the radiation chemistry of organic systems. Progress report, December 1, 1981-November 30, 1984. [Tetramethyl-p-phenylenediamine]

Technical Report ·
OSTI ID:6154777
The fluorescence of saturated hydrocarbon liquids excited by /sup 85/Kr beta particles has been studied as a function of the concentration of electron scavenger. It has been possible to extract the probability, p/sup +/, that the scavengers attach a geminate electron. The effect of N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) to scavenge geminate positive ions in irradiated hydrocarbon liquids has been studied via examination of the recombination fluorescence of TMPD/sup +/ + e/sup -/ as a function of TMPD concentration. The scavenging probability p/sup +/ is found to be simply proportional to c. An effect of electron scavengers to reduce the photocurrent from TMPD excited optically above its ionization threshold in nonpolar liquids has been observed and explained in terms of interaction of the scavenger with epithermal electrons. The field and temperature dependences of the photocurrent has been studied in the presence and absence of electron scavengers and the results support the epithermal model. The fractional reduction in TMPD fluorescence in liquid tetramethylsilane caused by imposition of an electric field has been studied as a function of excitation energy (above the photoionization threshold) and as a function of field strength. It has been possible to extract the photoionization quantum yield and the electron thermalization range from approx. = 5.5 eV to 7.5 eV. From an absolute measurement of the yield of excited solute states in irradiated benzene and comparison with optical measurements, it is concluded that the energy transfer efficiency is representable by a Stern-Volmer function that extrapolates to unity at infinite solute concentration. The excimer to monomer ratio in photoexcited polystyrene in solution is found not to depend on polystyrene concentration.
Research Organization:
Minnesota Univ., Minneapolis (USA)
DOE Contract Number:
AC02-76ER00913
OSTI ID:
6154777
Report Number(s):
DOE/ET/00913-3; ON: DE85004311
Country of Publication:
United States
Language:
English

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Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
AMINES
AROMATICS
BENZENE
BETA PARTICLES
CHARGED PARTICLES
CHEMISTRY
ELECTRIC FIELDS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLUIDS
FLUORESCENCE
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
ION PAIRS
IONIZATION
LIQUIDS
LUMINESCENCE
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SILICON COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHOTOIONIZATION
PLASTICS
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
RADIATION CHEMISTRY
RECOMBINATION
RESEARCH PROGRAMS
SCAVENGING
SILANES
SILICON COMPOUNDS
SYNTHETIC MATERIALS