Citations Only: Recent submissions
Now showing items 781-800 of 990
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Comparison of the electronic transitions of unconjugated thiones and imines: an exercise in the application of symmetry selection rules
(The American Chemical Society: Journal of Chemical Education, 1978-08)The purpose of this paper is to show how symmetry selection rules can be used to determine whether certain of the electronic transitions exhibited by the title compounds are allowed or forbidden by symmetry. -
Thermonuclear 36Cl pulse in natural water
(Nature Publishing Group: Nature, 1982-12-23)Radionuclides produced by atmospheric testing of nuclear weapons have been used as environmental tracers for the past 30 years. 185W and 90Sr have proved valuable in monitoring atmospheric circulation1, 14C has been applied ... -
36Cl bomb pulse measured in a shallow ice core from Dye 3, Greenland
(Nature Publishing Group: Nature, 1982-12-23)Nuclear weapons tests at oceanic sites during the 1950s produced a large amount of 36Cl (t 1/2 = 3.0 105 yr) through neutron capture of 35Cl in seawater. Part of this anthropogenic 36Cl was injected into the stratosphere ... -
Adhesion of copper to teflon surfaces modified by vacuum UV photo-oxidation downstream from Ar microwave plasma
(The American Chemical Society: Polymeric Materials Science and Engineering, 2004)Fluoropolymers, like Teflon(r) PTFE (polytetrafluoroethylene) and FEP (fluorinated ethylene-propylene co-polymer), have been extensively used in space applications, protective coatings, microelectronics packaging and ... -
Photo-oxidation of multiwalled carbon nanotubes
(Materials Research Society Proceedings: Degradation Processes in Nanostructured Materials, 2006)MWNTs were photo-oxidized in quartz boats using low-pressure Hg lamps and emission downstream from Ar microwave plasmas which are primarily atomic line sources of 253.7 and 184.9 nm UV, and 106.7 and 104.8 nm vacuum UV ... -
Photo-oxidation of singlewalled carbon nanotubes
(Materials Research Society Proceedings: Degradation Processes in Nanostructured Materials, 2006)UV- and vacuum UV-assisted photo-oxidation of single-walled carbon nanotube (SWNT) paper occurred with: (1) atmospheric oxygen pressure using low-pressure Hg lamps (ë = 253.7 and 184.9 nm), (2) low oxygen pressure employing ... -
Heats of formation and bond dissociation energies of some simple sulfur- and halogen-containing molecules
(The American Chemical Society: Journal of Chemical and Engineering Data, 1978-04)The heats of formation and bond dissoclation energies of some simple sulfur- and halogen-containing molecules are derived from information found in the literature. These thermochemical quantities are useful in determining ... -
Rotational spectroscopy of DO2 by FIR LMR and millimeter-wave absorption
(Elsevier: Journal of Molecular Spectroscopy, 1986-07)We report the measurement of approximately 50 rotational transitions in the DO2 radical between 230 and 2530 GHz by high-resolution millimeter-wave and far-infrared laser magnetic resonance spectroscopy. The radical was ... -
Surface modification of poly(biphenyl dianhydride-para-phenylene diamine) (BPDA-PDA) polyimide by UV photo-oxidation
(Springer-Verlag: Journal of Adhesion Science and Technology, 2006-03)Poly(biphenyl dianhydride-para-phenylene diamine) (BPDA-PDA, Upilex-S) polyimide (PI), was exposed to 185 and 254 nm UV radiation in the presence of oxygen at atmospheric pressure. SEM micrographs revealed only a small ... -
Primary products and secondary reactions in the photodecomposition of methyl halides
(The American Chemical Society: The Journal of Physical Chemistry, 1977-07-14)CH3I, CH3Br, and CH3CI have been photolyzed at 184.9 nm and CH3I at 253.7 nm, using CO, C2H4, C2H6, C3H8, C3D8, and CD4 as scavengers to assist in the identification of the primary decomposition products. The quantum yield ... -
Adhesion of copper to Teflon ® poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) (PFA) surfaces modified by vacuum UV photo-oxidation downstream from argon microwave plasma
(Materials Research Society Proceedings: Materials for Space Applications, 2005)Good practical adhesion of sputter-deposited Cu is achieved to poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) (PFA) surfaces at short treatment times of vacuum UV (VUV) photo-oxidation downstream from Ar ... -
Adhesion of copper to poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) surfaces modified by vacuum UV photo-oxidation downstream from Ar microwave plasma
(Springer-Verlag: Journal of Adhesion Science and Technology, 2004-12)Poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) surfaces were exposed to vacuum UV (VUV) photo-oxidation downstream from Ar microwave plasma. The modified surfaces showed the following: (1) an improvement in wettability ... -
Adhesion of copper to poly(tetrafluoroethylene) surfaces modified with vacuum UV radiation from helium arc plasma
(Springer-Verlag: Journal of Adhesion Science and Technology, 2003-12)Poly(tetrafluoroethylene) (PTFE) film surfaces were exposed to vacuum UV (VUV) radiation from He dc arc plasmas that were made to rotate inside a graphite tube by the application of an auxiliary magnetic field. The films ... -
Photoabsorption spectra of gaseous methyl bromide, ethylene dibromide, nitrosyl bromide, thionyl chloride, and sulfuryl chloride
(The American Chemical Society: The Journal of Physical Chemistry, 1978-10-05)The photoabsorption spectra of some molecules of atmospheric interest, CH3Br, BrCH2CH2Br, BrNO, SOCl2, and SO2Cl2, were quantitatively investigated over the wavelength region from 190 to 300 nm at 295 K and were found to ... -
Photoetching and modification of poly(tetrafluoroethylene-co-hexafluoropropylene) polymer surfaces with vacuum UV radiation
(Elsevier: Polymer Degradation and Stability, 2003-03)Films of poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) were exposed to radiation from 6.7 x 104 Pa He and Ar dc arc plasmas that were made to rotate inside of a graphite tube by the application of an auxiliary ... -
Reactions of hydrogen atoms and hydroxyl radicals with hydrogen bromide
(The American Chemical Society: The Journal of Physical Chemistry, 1973-04-12)A fast discharge-flow system was used to study reactions of hydrogen atoms and hydroxyl radicals with hydrogen bromide at 295 K. The reactions were followed by monitoring the epr spectra of H(2S1/2), Br(2P3/2), and OH(2pi3/2) ... -
Reactions of hydroxyl radicals with some hydrogen halides
(The American Chemical Society: The Journal of Physical Chemistry, 1973-08-02)The reactions of OH with HCl and HI have been studied in a fast flow system. Hydroxyl radicals were generated by NO2 titration of atomic hydrogen, and concentrations of OH, Cl , and I were determined at various reaction ... -
Atmospheric photodissociation lifetimes for nitromethane, methyl nitrite, and methyl nitrate
(Wiley: International Journal of Chemical Kinetics, 1980-04)Atmospheric photodissociation rate coefficients and photodissociation lifetimes for nitromethane, methyl nitrite, and methyl nitrate were calculated as a function of altitude from their measured visible and near ultraviolet ... -
Copoly: a tool for understanding copolymerization and monomer sequence distribution of copolymers
(The American Chemical Society: The Journal of Chemical Education, 2003-07) -
A novel ultra-violet assisted anisotropic etching of plastic to realize micro-gears
(Elsevier: Sensors and Actuators A: Physical, 2004-09-21)An ultraviolet assisted chemical etching of plastic is reported in which the etching of PET substrates is anisotropic in the direction of light illumination. A strong solvent as di-methyl-formamide (DMF) is exploited to ...