19 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Photochemistry"  
Results: 1 - 19
open access

Photoexcited Charge Pair Escape and Recombination

Description: We report photocurrent transients arising from the pulsed laser excitation of the dipolar first excited singlet sate S{sub 1} of trans 4-dimethyl-amino-4{prime}-nitrostilbene (DMANS) in toluene solution. The currents arise from rotational reorientation of DMANS dipoles with respect to the axis of an applied electric field. The method appears to offer a simple and general approach to the measurement of the change in dipole moment upon electronic excitation of a molecule. In another experiment, d… more
Date: November 15, 1991
Creator: Braun, Charles L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of a practical photochemical energy storage system. Quarterly report

Description: The emphasis of work during this past quarter has been on improvement of the performance of immobilized photosensitizers. Prolonged use of Polymer N in the recycling prototype has resulted in gradual deterioration of the behavior of this photosensitizer. Furthermore the opacity of the beads results in an inherent 20% loss in efficiency apparently through light reflection. In an attempt to improve the characteristics with respect to these points considerable effort was devoted in the synthetic g… more
Date: March 15, 1977
Creator: Hautala, R.R. & Kutal, C.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of a practical photochemical energy storage system. Quarterly report, July 1, 1977--September 30, 1977

Description: During this quarter the portion of this project concerned with catalysis has concentrated on the development of increased understanding of the cobalt(II) porphyrin catalyst. Of potential importance is the observation that the activity of partially deactivated catalysts can be partially restored by treatment with titanium(III) solutions thereby suggesting that a major cause of the losses of activity of catalysts upon repeated recycling arises from oxidation of cobalt(II) to cobalt(III). The prev… more
Date: September 15, 1977
Creator: Hautala, R.R. & Kutal, C.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Photoexcited charge pair escape and recombination. Progress report, November 15, 1990--November 14, 1991

Description: We report photocurrent transients arising from the pulsed laser excitation of the dipolar first excited singlet sate S{sub 1} of trans 4-dimethyl-amino-4{prime}-nitrostilbene (DMANS) in toluene solution. The currents arise from rotational reorientation of DMANS dipoles with respect to the axis of an applied electric field. The method appears to offer a simple and general approach to the measurement of the change in dipole moment upon electronic excitation of a molecule. In another experiment, d… more
Date: November 15, 1991
Creator: Braun, C. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

2011 Photochemistry Gordon Research Conference (July10-15, 2011, Stonehill College, Easton, MA)

Description: Photochemistry has wide implications on fundamental science with technological applications that range from synthetic and mechanistic organic and inorganic chemistry to sensing/manipulation in the biological sciences to viable solar energy conversion assemblies. The 2011 Gordon Research Conference on Photochemistry will highlight recent advances on photochemical reactions, their mechanisms, spectroscopic techniques and applications to materials, organic synthesis, and biology. The conference wi… more
Date: July 15, 2011
Creator: Meyer, Prof. Gerald
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Membrane-Organized Chemical Photoredox Systems

Description: This project has three interrelated goals relevant to solar water photolysis, which are to develop: (1) vesicle-organized assemblies for H2 photoproduction that utilize pyrylium and structurally related compounds as combined photosensitizers and cyclic electroneutral transmembrane electron carriers; (2) transmembrane redox systems whose reaction rates can be modulated by light; and (3) homogeneous catalysts for water oxidation. In area (1), initial efforts to photogenerate H2 from vectorially-o… more
Date: May 15, 2007
Creator: Hurst, James K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electrochemical and optical studies of model photosynthetic systems. Final progress report, July 1, 1984--August 31, 1989

Description: The objective of this research is to obtain a better understanding of the relationship between the structural organization of photosynthetic pigments and their spectroscopic and electrochemical properties. Defined model systems were studied first. These included the least ordered (solutions) through the most highly ordered (Langmuir-Blodgett (LB) monolayers and self-assembled monolayers) systems containing BChl, BPheo, and UQ. Molecules other than the photosynthetic pigments and quinones were a… more
Date: January 15, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electrochemical and optical studies of model photosynthetic systems

Description: The objective of this research is to obtain a better understanding of the relationship between the structural organization of photosynthetic pigments and their spectroscopic and electrochemical properties. Defined model systems were studied first. These included the least ordered (solutions) through the most highly ordered (Langmuir-Blodgett (LB) monolayers and self-assembled monolayers) systems containing BChl, BPheo, and UQ. Molecules other than the photosynthetic pigments and quinones were a… more
Date: January 15, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Photoinduced electron transfer reaction in zeolite cages

Description: Research continued on photochemically induced electron transfer in zeolites. Reactions and synthesis of Ru(bpy){sub 3}{sup 2+} are discussed. Also, the intercalation properties of LiAl{sub 2}(OH){sub 6}{sup +}-X{sup {minus}} are being pursued. 5 figs. (CBS)
Date: January 15, 1990
Creator: Dutta, P. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen