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  • Other Sources  (9)
  • 1990-1994  (8)
  • 1965-1969  (1)
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  • 1
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    A compact, high resolution Michelson interferometer for atmospheric spectroscopy in the near ultraviolet (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A new, compact Fourier Transform Michelson interferometer (FTUV) with an apodized resolving power greater than 300,000 at 300 nm, high throughput and wide spectral coverage has been developed. The objectives include atmospheric spectroscopy (direct solar absorption and solar scattering) and laboratory spectroscopy of transient species. In this paper, we will briefly describe the prototype FTUV instrument and the results of preliminary laboratory investigations of OH and ClO spectra in emission and absorption.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: Optical methods in atmospheric chemistry; Proceedings of the Meeting, Berlin, Germany, June 22-24, 1992 (A93-51501 22-35); p. 15-17.
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  • 2
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    Tunable diode laser IR spectrometer for in situ measurements of the gas phase composition and particle size distribution of Titan's atmosphere (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A new instrument, the Probe Infrared Laser Spectrometer (PIRLS), is described for in situ sensing of the gas composition and particle size distribution of Titan's atmosphere on the NASA/ESA Cassini mission. For gas composition measurements, several narrow-band (0.0001/cm) tunable lead-salt diode lasers operating near 80 K at selected mid-IR wavelengths are directed over a path length defined by a small reflector extending over the edge of the probe spacecraft platform; volume mixing ratios of 10 to the -9th should be measurable for several species of interest. A cloud-particle-size spectrometer using a diode laser source at 780 nm shares the optical path and deployed reflector; a combination of imaging and light scattering techniques is used to determine sizes of haze and cloud particles and their number density as a function of altitude.
    Keywords: LASERS AND MASERS
    Type: Applied Optics (ISSN 0003-6935); 29; 907-917
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  • 3
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    Evaluated rate constants for selected HCFC's and HFC's with OH and O((sup)1D) (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The chemistry of HCFC's and HFC's in the troposphere is controlled by reactions with OH in which a hydrogen atom is abstracted from the halocarbon to form water and a halo-alkyl radical. The halo-alkyl radical subsequently reacts with molecular oxygen to form a peroxy radical. The reactions of HCFC's and HFC's with O(exp1D) atoms are unimportant in the troposphere, but may be important in producing active chlorine of OH in the stratosphere. Here, the rate constants for the reactions of OH and O(exp1D) with many HFC's and HCFC's are evaluated. Recommendations are given for the five HCFC's and three HFC's specified by AFEAS as primary alternatives as well as for all other isomers of C1 and C2 HCFC's and HFC's where rate data exist. In addition, recommendations are included for CH3CCl3, CH2Cl2, and CH4.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA, Scientific Assessment of Stratospheric Ozone: 1989, Volume 2. Appendix: AFEAS Report; p 43-104
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  • 4
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    JPL Fourier transform ultraviolet spectrometer (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The Fourier Transform Ultraviolet Spectrometer (FTUVS) is a new high resolution interferometric spectrometer for multiple-species detection in the UV, visible and near-IR. As an OH sensor, measurements can be carried out by remote sensing (limb emission and column absorption), or in-situ sensing (long-path absorption or laser-induced fluorescence). As a high resolution detector in a high repetition rate (greater than 10 kHz) LIF system, OH fluorescence can be discriminated against non-resonant background emission and laser scatter, permitting (0, 0) excitation.
    Keywords: ENVIRONMENT POLLUTION
    Type: SRI International Corp., Local Measurement of Tropospheric HO(x); 1 p
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  • 5
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    Kinetics and Mechanism of the CIO + CIO Reaction: Pressure and Temperature Dependences of the Bimolecular and Termolecular Channels andThermal Decomposition of Chlorine Peroxide, CIOOCI (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The kinetics and mechanism of the CIO + CIO reaction and the thermal decomposition of CIOOCI were studied using the flash photolysis/long path ultraviolet absorption technique. Pressure and temperature dependences were determined for the rate coefficients for the bimolecular and termolecular reaction channels, and for the thermal decompositon of CIOOCI.
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  • 6
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    Experimental and Theoretical Studies of Atmosphereic Inorganic Chlorine Chemistry (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Over the last five years substantial progress has been made in defining the realm of new chlorine chemistry in the polar stratosphere. Application of existing experimental techniques to potentially important chlorine-containing compounds has yielded quantitative kinetic and spectroscopic data as well as qualitative mechanistic insights into the relevant reactions.
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  • 7
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    Chloryl nitrate - A novel product of the OClO + NO3 + M recombination (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The products of the reaction of OClO with NO3 were investigated between 220 and 298 K using a flow reactor and infrared, visible, and ultraviolet analysis. At temperatures below 250 K new infrared and ultraviolet absorption features were observed and assigned to the novel compound chloryl nitrate (O2ClONO2). Additionally, ClO and NO2 were observed as reaction products, indicating the existence of a second reaction channel. O2ClONO2 formation predominates at temperatures below 230 K. The reaction rate constant at 220 K is estimated to be on the order of 10 exp -14 cu cm/molecule s in 1-5 Torr of helium. These observations suggest that O2ClONO2 may exist in the terrestrial stratosphere.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry (ISSN 0022-3654); 96; 19; p. 7490-7493.
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  • 8
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    Spatial variation of ozone depletion rates in the springtime Antarctic polar vortex (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An area-mapping technique, designed to filter out synoptic perturbations of the Antarctic polar vortex such as distortion or displacement away from the pole, was applied to the Nimbus-7 TOMS (Total Ozone Mapping Spectrometer) data. This procedure reveals the detailed morphology of the temporal evolution of column O3. The results for the austral spring of 1987 suggest the existence of a relatively stable collar region enclosing an interior that is undergoing large variations. A simplified photochemical model of O3 loss and the temporal evolution of the area-mapped polar O3 are used to constrain the chlorine monoxide (ClO) concentrations in the springtime Antarctic vortex. The O3 loss rates could be larger than deduced here because of underestimates of total O3 by TOMS near the terminator.
    Keywords: GEOPHYSICS
    Type: Science (ISSN 0036-8075); 248; 721-724
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  • 9
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    Production of NO2 from Photolysis of Peroxyacetyl Nitrate (1965)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: Peroxyacetyl nitrate (PAN) vapor was photolyzed at 248 nm, and the NO2 photoproduct was detected by laser-induced fluorescence. The quantum yield for the production of NO2 from PAN photolysis was determined by comparison to HNO3 photolysis data taken under identical experimental conditions. The average of data collected over a range of total pressures, precursor concentrations, and buffer gases was 0.83 +/- 0.09 for the NO2 quantum yield, where the statistical uncertainty is 2 standard deviations.
    Keywords: Inorganic and Physical Chemistry
    Type: NASA-CR-203214 , NAS 1.26:203214 , The Journal of Physical Chemistry (ISSN 0022-3654); 99; 8162-8169
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