New measurements have been made of rate constants for electron attachment to c-C4F8 (octafluorocyclobutane) and thermal electron detachment from the parent anion, c-C4F8(-), over the temperature range 298-400 K in 133 Pa of He gas in a flowing-afterglow Langmuir-probe apparatus. From these data the electron affinity for c-C4F8 was determined, EA(c-C4F8) = 0.63 +/- 0.05 eV. The motivation was to resolve a discrepancy between our earlier EA estimate and a ...
Our research program focuses on identifying reaction processes important for plasma enhancement of combustion systems. Recommendations for temperature and energy dependencies of key ion-molecule reactions are made based on the laboratory measurements described above. Thermodynamic data such as heat capacity entropy, and enthalpy are not available as a function of temperature for many of the ionic species formed in these reactions and are thus calculated using quantum mechanical methods. The ...
This report lists the laser equipment purchased which consists primarily of an argon ion laser and a ring dye laser. It describes how this equipment is being set up in conjunction with a flowing afterflow apparatus to study the photodissociation of positive and negative molecular ions, and the photodetachment of negative ions. Future uses of the equipment are outlined.
The forward and reverse cross sections have been calculated for Na + Cl yielding Na(+) + Cl(-) and K + Cl yielding K(+) + Cl(-) using quantum close-coupling techniques with matrix elements derived from pseudo-potential calculations. The collision energy-dependent cross sections were Boltzmann-averaged to obtain temperature-dependent thermal reaction rate coefficients. Equilibrium constants k(eq) = k(recomb)/k(ioniz) were also calculated for 1000 K < T < 3000 K. An effort was made ...
The interaction of metastable rare gas atoms with ground state atoms is being investigated in the energy range from several eV to 1 keV. Emphasis is on collisional ionization and collisional excitation transfer. Additional work examines details of the charge transfer reaction used to produce the fast metastable atom beams.
Studies of the interaction of metastable atoms with ground state atoms are briefly reported. Experimental and theoretical research has been performed for excitation transfer, ionization, and charge transfer in collisions involving metastable atoms. The energy range covered is from a few eV up to several keV.
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