Comparison of photoconductivity and optical spectra of the trapped electron in polar aqueous and alcoholic glasses

Journal Article · Thu May 05 00:00:00 EDT 1977 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100524a009· OSTI ID:7219928

Rice, S A; Kevan, L

The photoconductivity spectra of polar aqueous and alcoholic matrices at 85 K containing trapped electrons are reported and are of two principal types. Type A systems (aqueous 10 M NaOH, 7 M MaCIO/sub 4/, and 7.5 M CH/sub 3/COOK) show a similar wavelength dependence between the photoconductivity and optical absorption spectra, which implies dominance of bound-continuum transitions. Type B systems (aqueous 2.35 M sucrose, aqueous 10 M LiCl, methanol, equivolume ethylene glycol--water, glycerol, and possibly aqueous 7.2 M sodium formate) display photoconductivity spectra of the trapped electron which are significantly blue shifted from the optical absorption spectra, indicating dominance of bound--bound transitions in the main part of the optical spectra and a bound--continuum contribution in the high energy tail of the optical spectra. Also trapped electrons in aqueous 5 M K/sub 2/CO/sub 3/ show some correspondence of the photoconductivity and optical spectra at long wavelengths while at short wavelengths the photoconductivity spectra are blue shifted. Thus, both bound--bound and bound--continuum transitions may exist, but closely overlap. For aqueous 10 M NaOH glasses no photocurrent emitted into vacuum could be observed above the noise level which was approximately 10/sup -2/ of the photocurrent.

• Research Organization: Wayne State Univ., Detroit
• OSTI ID: 7219928
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 81:9; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ABSORPTION SPECTRA
ALCOHOLS
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CARBOHYDRATES
CARBON COMPOUNDS
CARBONATES
CARBOXYLIC ACID SALTS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE COMPOUNDS
DECOMPOSITION
DISACCHARIDES
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
FERMIONS
FORMATES
GAMMA RADIATION
GLASS
GLYCEROL
GLYCOLS
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
IONIZING RADIATIONS
LEPTONS
LOW TEMPERATURE
METHANOL
MIXTURES
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PERCHLORATES
PHOTOCONDUCTIVITY
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADIOLYSIS
SACCHARIDES
SACCHAROSE
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SODIUM PERCHLORATES
SOLUTIONS
SPECTRA
TRAPPED ELECTRONS