Threshold photoionization spectra of excited solute electronic states in nonpolar liquids
- Cornell Univ., Ithaca, NY (USA)
Photoconductivity spectra are reported for the first excited singlet (S{sub 1}) and triplet (T{sub 1}) states of N,N,N{prime},N{prime}-tetramethyl-p-phenylenediamine (TMPD) in nonpolar organic solvents at room temperature. The measured ionization potentials, corrected for the excited-state energies, agree well with those derived from previously published TMPD ground-state (S{sub 0}) photoionization studies. The excited-state spectra and the S{sub 0} spectrum both increase in magnitude with increasing excitation frequency, first exponentially and then as a power law in excess energy above the ionization threshold. This behavior is similar to that of the absorption spectra of amorphous semiconductors. In each case, direct excitation of the photodonor into the conduction band of the solvent is indicated (instead of autoionization from a superexcited state of TMPD). In one instance unambiguous evidence for this path is encountered.
- OSTI ID:
- 6518567
- Journal Information:
- Journal of Physical Chemistry; (USA), Vol. 94:11; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
PHOTOCHEMISTRY
PHOTOCONDUCTIVITY
AMINES
DATA ANALYSIS
EXCITED STATES
EXPERIMENTAL DATA
LIQUIDS
MEASURING INSTRUMENTS
MEASURING METHODS
PHOTOIONIZATION
CHEMISTRY
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
FLUIDS
INFORMATION
IONIZATION
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
400500* - Photochemistry