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  • 2005-2009
  • 1990-1994  (3)
  • 1990  (3)
Material
Years
  • 2005-2009
  • 1990-1994  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 347-357 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: State-to-state integral cross sections for rovibrationally inelastic collisions between CO2 and hot hydrogen atoms are obtained by inversion of rotationally resolved population measurements of CO2 (0001). The inversion/fitting procedure is based upon the infinite order sudden (IOS) scaling law and employs a spline interpolating model to reduce the amount of information to be extracted. The experimental data used in the analysis was obtained using time domain tunable diode laser absorption spectroscopy to measure rotationally resolved excitation in CO2 (0001) following the generation of translationally hot H atoms via H2S photolysis at 193 nm. The analysis utilizes data acquired at two temperatures, 292 and 223 K, in order to acquire additional information about the temperature independent scattering cross sections. Sensitivity analysis is employed to gauge the sensitivity of the extracted cross sections to uncertainties in the experimental data, and also to estimate the effect of additional measurements at different temperatures. The final extracted cross sections exhibit strong rotational inelasticity, with a propensity for scattering from 0000; J' to both 0001; J=J' and 0001; J=||J'±41||. The largest state-to-state collision cross section corresponds to the (0000; J'=0) to (0001; J=41) transition and has a magnitude of (2.0±0.4)×10−3 A(ring)2.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4876-4886 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time-domain tunable diode laser absorption spectroscopy has been used to measure rotationally resolved transient absorption line shapes and nascent rotational populations for CO2 molecules excited into the (0001) vibrational state by collisions with translationally hot hydrogen atoms. High-accuracy measurements were made at both 292 and 223 K, providing information about the initial-state dependence of the collision dynamics and about the (temperature-independent) state–to–state scattering cross sections. The nascent rotational population distribution is found to be nearly independent of temperature, indicating broad rotational inelasticity in the 0000→0001 scattering process. The nascent populations and transient linewidths are interpreted in terms of two separate theoretical models which lend substantial insight into the H–CO2 collision dynamics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 3
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time domain tunable diode laser absorption spectroscopy has been used to measure rotationally resolved transient absorption line shapes and nascent rotational populations for CO2 molecules excited into the (0111) vibrational state by collisions with translationally hot hydrogen atoms. The even rotational levels are more heavily populated than the odd levels, in agreement with propensity rules derived earlier by Alexander and Clary. The nascent populations and transient linewidths are interpreted in terms of a theoretical model that lends insight into the H–CO2 collision dynamics. The cross section for exciting (0111) is ∼0.23 times the cross section for exciting (0001), and ∼0.38 times the cross section for exciting (1000).
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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