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  • 1
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    Induced ClO vacuum ultraviolet fluorescence (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Some vibronic transitions of ClO such as G(v-prime = 11 )-X(v-double prime = 10), G(v-prime = 5)-X(v-double prime = 3) and H(v-prime = 4)-X(v-double prime = 2), which promote overtones of X(2pi3/2) to bound Rydberg states, are nearly resonant with the 130.6 nm O-atom emission line and possess sizable Franck-Condon factors. On this basis broadband detection of 'O atom' fluorescence in experiments involving vibrationally excited ClO(X) is ascribed to the radiative decay of ClO(G, H) rather than to the formation of O atoms; these observations raise the probability of monitoring ClO(X; v = 0) by VUV-induced fluorescence.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Chemical Physics Letters (ISSN 0009-2614); 187; 1-2; p. 85-92.
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  • 2
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    Temperature dependence and mechanism of the reaction between O(3P) and chlorine dioxide (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Second-order rate constants for the decay of O(3P) in excess chlorine dioxide, k(II), were measured as a function of total pressure (20-600 Torr argon) and temperature (248-312 K), using flash photolysis-atomic resonance fluorescence. Results indicate that k(II) is pressure dependent with a value, K(b), that is nonzero at zero pressure, and both the third-order rate constant and k(b) have negative temperature dependences.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry (ISSN 0022-3654); 96; 11; p. 4442-4445.
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  • 3
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    Thermodynamics of acetylene van der Waals dimerization (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Integrated band intensities of the 620/cm absorption in (C2H2)2 are measured by FTIR spectroscopy at constant acetylene pressure between 198 and 273 K. These data, in conjunction with ab initio results for (C2H2)2, are used for the statistical evaluation of the equilibrium constant Kp(T) for acetylene-cluster dimerization. The present results are used to clarify the role of molecular clusters in chemical systems at or near equilibrium, in particular in Titan's stratosphere.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Chemical Physics Letters (ISSN 0009-2614); 178; 497-503
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  • 4
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    Temperature dependence of the NO3 absorption spectrum (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The absorption spectrum of the gas-phase NO3 radical has been studied between 220 and 700 nm by using both flash photolysis and discharge flow reactors for the production of NO3. In the flash photolysis method, cross sections at the peak of the (0,0) band at 661.9 nm were measured relative to the cross section of ClONO2 at several different wavelengths. From the best current measurements of the ClONO2 spectrum, the NO3 cross section at 661.9 nm was determined to be (2.28 + or 0.34) x 10 to the -17th sq cm/molecule at 298 K. Measurements at 230 K indicated that the cross section increases by a factor of 1.18 at the peak of the (0,0) band. The discharge flow method was used both to obtain absolute cross sections at 661.9 nm and to obtain relative absorption spectra between 300 and 700 nm at 298 and 230 K. A value of (1.83 + or - 0.27) x 10 to the -17th sq cm/molecule was obtained for sigma NO3 at 661.9 nm at 298 K. Upper limits to the NO3 cross sections were also measured between 220 and 260 nm with the discharge flow method.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry (ISSN 0022-3654); 90; 17, 1; 4135-414
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  • 5
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    Temperature dependence of the reaction NO + NO3 - 2NO2 (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The flash photolysis-visible absorption technique has been used to measure rate constants for the reaction NO + NO3 2NO2 over the temperature range 224-328 K. The temperature dependence of the rate constant is given by the expression K1(T) = (1.59 + or - 0.32) x 10 to the -11th exp(122/T)cu cm/molecule/s where the stated uncertainties refer to the + or - sigma limits from both random and systematic errors.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Chemical Physics Letters (ISSN 0009-2614); 126; 149-152
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  • 6
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    Kinetics of the reaction HO2 + NO2 + M yields HO2NO2 + M (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The flash photolysis/ultraviolet absorption technique was used to measure the rate constants for the reaction HO2 + NO2 + M yields HO2NO2 + M over the pressure range 50-700 torr and temperature range 229-362 K using He, O2, and N2 as diluent gases. The data were fit to the expression derived by Troe (1979) and co-workers for describing the pressure and temperature dependence of reactions in the falloff region. By combining these data with recent measurements of the rate constant for HO2NO2 thermal decomposition values of 73.8 + or - 2 eu for the standard entropy and -12.6 + or - kcal/mol for the standard enthalpy of formation of HO2NO2 were obtained. A significant enhancement in the rate constant was observed when water vapor was added to the system.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry (ISSN 0022-3654); 88; 1566-157
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  • 7
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    Pressure and temperature dependence of the reaction NO2 + NO3 + M yields N2O5 + M (1984)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The pressure and temperature dependences of the reaction NO2 + NO3 + M which yields N2O5 + M are investigated by using the flash photolysis/visible absorption technique in which the pseudo-first-order decay of NO3 is monitored as a function of total pressure (20-700 torr), diluent gas (M = He and N2), and temperature (236-358 K). The reaction is found to be in the falloff region in the 20-700 torr pressure range with collision efficiencies increasing in the order He less than N2. Falloff parameters are obtained by fitting the experimental data to the falloff equation of Troe and co-workers. The expression for k1(N2 concentration, T) is obtained and compared with the evaluations presented in the NASA (DeMore, 1983) and CODATA (Baulch et al., 1982) reviews of kinetic data for atmospheric chemistry. Both evaluations are based on N2O5 thermal decomposition data coupled with estimates of the equilibrium constant. The significance of the reactions for atmospheric chemistry rests not only on their rates but on the extent to which they result in a permanent sink for NOX.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry (ISSN 0022-3654); 88; 19, 1; 4370-437
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  • 8
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    Absolute infrared band strength measurement of the ClO radical by Fourier transform infrared spectroscopy (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: High-resolution (0.005/cm) FTIR spectra of the X2Pi(i)-X2Pi(i) (1-0) rovibrational bands of (C-35)(O-16) and (Cl-37)(O-16) were obtained in 1 torr of helium carrier gas. After measuring the strengths of approximately 830 individual IR lines from several spectra, a total band strength of 13.1 + or - 1.1/sq cm atm and a first Herman-Wallis coefficient of (4.12 + or - 0.62) x 10 to the -3rd were determined.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Molecular Spectroscopy (ISSN 0022-2852); 132; 89-103
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  • 9
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    Kinetics and product studies of the reaction ClO + BrO using discharge-flow mass spectrometry (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The kinetics and product branching ratios of the reaction between ClO and BrO were studied at 1 torr pressure over the temperature range 220-400 K, using the method of discharge-flow mass spectrometry. Three product channels were identified and quantified: Br + ClOO, Br + OClO, and BrCl + O2, indicating that the reaction mechanism of ClO + BrO involves metastable intermediates. The overall reaction rate coefficient and the rate coefficients for the three channel reactions are given.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry (ISSN 0022-3654); 93; 12, 1
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  • 10
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    Kinetics and product studies of the reaction ClO + BrO using flash photolysis-ultraviolet absorption (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The reaction between BrO and ClO was studied over the pressure range 50-700 torr and temperature range 220-400 K, using the flash photolysis-ultraviolet absorption method described by Watson et al. (1979). In order to investigate the mechanism of the BrO + ClO reaction, the product branch reactions Br + Cl2O yielding ClO + BrCl and Cl2O + h(nu) yielding products were examined. The rate constant for the overall reaction and the Arrhenius expression for the Br + Cl2O reaction are given, as well as the quantum yield for the production of atomic oxygen from the Cl2O photolysis.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry (ISSN 0022-3654); 93; 12, 1
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