Electron impact study of carbon dioxide dimers in a supersonic molecular beam: Appearance potentials of (CO/sub 2/)/sup +//sub 2/, (CO CO/sub 2/)/sup +/, and (Ar CO/sub 2/)/sup +/

Journal Article · Wed Sep 01 00:00:00 EDT 1982 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.444163· OSTI ID:5020913

Stephan, K; Futrell, J H; Peterson, K I; Castleman, Jr, A W; Maerk, T D

Electron impact ionization of (CO/sub 2/)/sub n/ clusters (1< or =n< or =5) was investigated in a molecular beam experiment coupled with a double focusing mass spectrometer. A special ion optical system and operating mode (deflection method) was used to discriminate between beam species and background species. For both neat and seeded (He, Ar, Kr) beams we have studied, ion beam profiles extracted from the ion source in order to obtain information about neutral cluster beam properties. All appearance potentials reported in this work have been referenced to rare gases in either the static gas or seeded beam mixtures. The following appearance potentials were obtained: (CO/sub 2/)/sub 2/+e..-->..(CO/sub 2/)/sup +//sub 2/, AP = 13.1 +- 0.2 eV, (CO/sub 2/)/sub 2/+e..-->..(CO CO/sub 2/)/sup +/, AP = 19.1 +- 0.5 eV, Ar CO/sub 2/+e..-->..(Ar CO/sub 2/)/sup +/, AP = 13.1 +- 0.5 eV. The exothermicity of the reaction of CO/sup +//sub 2/ with CO/sub 2/ to form (CO/sub 2/)/sup +//sub 2/ was found to be 17.1 +- 5 kcal/mol in good agreement with previous high pressure mass spectrometry determinations.

• Research Organization: A. f. Kernphysik und Gaselektronik, Institut f. Experimentalphysik, Leopold Franzens Universitaet, A 6020 Innsbruck, Osterreich, Austria
• OSTI ID: 5020913
• Journal Information: J. Chem. Phys.; (United States), Vol. 77:5
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CARBON DIOXIDE
ELECTRON-MOLECULE COLLISIONS
IONIZATION
DIMERS
ION PAIRS
MASS SPECTROSCOPY
MOLECULAR BEAMS
BEAMS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
ELECTRON COLLISIONS
MOLECULE COLLISIONS
OXIDES
OXYGEN COMPOUNDS
SPECTROSCOPY
640304* - Atomic
Molecular &amp; Chemical Physics- Collision Phenomena