Collisional ionization between alkali atoms and some methane derivatives: Electron affinities for CH/sub 3/NO/sub 2/, CF/sub 3/I, and CF/sub 3/Br

Journal Article · Mon May 15 04:00:00 EDT 1978 · J. Chem. Phys.; (United States)

OSTI ID:7087059

Compton, R N; Reinhardt, P W; Cooper, C D

The negative ion products resulting from collisions between orthogonal beams of alkali atoms (Na, K, Cs) and the methane derivatives CH/sub 3/CN, CH/sub 3/NO/sub 2/, CF/sub 3/Br, and CF/sub 3/I have been studied in the energy range from reaction thresholds to approx.40 eV (LAB). Stable negative ions with masses corresponding to the last three molecules were detected and the following electron affinities are derived from measurements of the energy threshold for the ion pair production reactions: E.A.(CH/sub 3/NO/sub 2/) =0.44/sup +0.1//sub -0.2/ eV; E.A.(CF/sub 3/Br) =0.91 +- 0.2 eV, and E.A.(CF/sub 3/I) =1.57 +- 0.2 eV. From measurements of the difference between the energy threshold for the appearance of various fragment ions and the parent ion, the following bond dissociation energies are deduced: D(CH/sub 3/--NO/sup -//sub 2/) =0.56 +- 0.2 eV; D(CF/sub 3/--Br/sup -/) =0.54 +- 0.2 eV and D(CF/sub 3/--I/sup -/) =0.32 +- 0.2 eV. An argument is presented which adds further strength to the suggestions of Williams et al. and Jordan and Wendoloski that electron binding to CH/sub 3/CN is dominated by the dipole field.

• Research Organization: Chemical Physics Section, Health and Safety Research Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• OSTI ID: 7087059
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 68:10; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
AFFINITY
ALKALI METALS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
ATOMIC BEAMS
BEAMS
BROMINATED ALIPHATIC HYDROCARBONS
CESIUM
COLLISIONS
ELEMENTS
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
IODINATED ALIPHATIC HYDROCARBONS
IONIZATION
METALS
MOLECULE COLLISIONS
NITRILES
NITROSO COMPOUNDS
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
POTASSIUM
SODIUM