The photodissociation of oxalyl chloride and 2,3 butanedione at 193nm and 248nm have been studied by Time resolved FTIR emission spectroscopy. The IR fluorescence emission was observed and the rotational and vibration...The photodissociation of oxalyl chloride and 2,3 butanedione at 193nm and 248nm have been studied by Time resolved FTIR emission spectroscopy. The IR fluorescence emission was observed and the rotational and vibrational populations of the CO product were obtained. It is suggested that the photolysis mechanism is two RCO radicals formed via a fission of C-C bond, followed by a decomposition of the RCO intermediate to vibrationally excited CO( v ) and R radical.展开更多
The photolysis of uracil in phosphate-buffered saline (PBS, pH 8.0) under the irradiation pf medium pressure mercury lamp (MPML) leads to the production of a novel compound C4H5N2O6P. The composition and structure of ...The photolysis of uracil in phosphate-buffered saline (PBS, pH 8.0) under the irradiation pf medium pressure mercury lamp (MPML) leads to the production of a novel compound C4H5N2O6P. The composition and structure of the compound has been identified by elemental analysis, EI-MS, UV, IR, H-1, C-13, P-31-NMR.展开更多
UV photolysis and UV based advanced oxidation processes （AOPs） are gaining more and more attention for drinking water treatment. Quantum yield （Ф） and molar absorption coefficient （ε） are the two critical para...UV photolysis and UV based advanced oxidation processes （AOPs） are gaining more and more attention for drinking water treatment. Quantum yield （Ф） and molar absorption coefficient （ε） are the two critical parameters measuring the effectiveness of photolysis of a compound. The product of the two was proposed as a fundamental measure of a constituent＇s amenability to transformation by photolysis. It was shown that this product, named the photolysis coefficient, kp, can be determined using standard bench tests and captures the properties that govern a constituent＇s transformation when exposed to light. The development showed the photolysis coefficient to be equally useful for microbiological, inorganic and organic constituents. Values of kp calculated by the authors based on quantum yield and molar absorption coefficient data from the literature were summarized. Photolysis coefficients among microorganisms ranged from 8500 to more than 600000 and are far higher than for inorganic and organic compounds, which varied over a range of approximately 10 to 1000 and are much less sensitive to UV photolysis than the microorganisms.展开更多
Under the irradiation of medium pressure mercury lamp (MPML) the photolysis of 2-methoxycytosine (MAP) in phosphate solution leads to the production of a novel compound C5H8N3O5P. The composition and structure of the ...Under the irradiation of medium pressure mercury lamp (MPML) the photolysis of 2-methoxycytosine (MAP) in phosphate solution leads to the production of a novel compound C5H8N3O5P. The composition and structure of the compound has been identified by elemental analysis. EI-MS, UV, IR, H-1, P-31-NMR.展开更多
文摘The photodissociation of oxalyl chloride and 2,3 butanedione at 193nm and 248nm have been studied by Time resolved FTIR emission spectroscopy. The IR fluorescence emission was observed and the rotational and vibrational populations of the CO product were obtained. It is suggested that the photolysis mechanism is two RCO radicals formed via a fission of C-C bond, followed by a decomposition of the RCO intermediate to vibrationally excited CO( v ) and R radical.
文摘The photolysis of uracil in phosphate-buffered saline (PBS, pH 8.0) under the irradiation pf medium pressure mercury lamp (MPML) leads to the production of a novel compound C4H5N2O6P. The composition and structure of the compound has been identified by elemental analysis, EI-MS, UV, IR, H-1, C-13, P-31-NMR.
文摘UV photolysis and UV based advanced oxidation processes （AOPs） are gaining more and more attention for drinking water treatment. Quantum yield （Ф） and molar absorption coefficient （ε） are the two critical parameters measuring the effectiveness of photolysis of a compound. The product of the two was proposed as a fundamental measure of a constituent＇s amenability to transformation by photolysis. It was shown that this product, named the photolysis coefficient, kp, can be determined using standard bench tests and captures the properties that govern a constituent＇s transformation when exposed to light. The development showed the photolysis coefficient to be equally useful for microbiological, inorganic and organic constituents. Values of kp calculated by the authors based on quantum yield and molar absorption coefficient data from the literature were summarized. Photolysis coefficients among microorganisms ranged from 8500 to more than 600000 and are far higher than for inorganic and organic compounds, which varied over a range of approximately 10 to 1000 and are much less sensitive to UV photolysis than the microorganisms.
文摘Under the irradiation of medium pressure mercury lamp (MPML) the photolysis of 2-methoxycytosine (MAP) in phosphate solution leads to the production of a novel compound C5H8N3O5P. The composition and structure of the compound has been identified by elemental analysis. EI-MS, UV, IR, H-1, P-31-NMR.
