Total dissociation cross section of CF/sub 4/ and other fluoroalkanes for electron impact
Journal Article
·
· Phys. Rev. A; (United States)
Various techniques from the field of surface science have allowed the development of a method for measuring the total absolute cross section for electron-impact-induced dissociation of a number of molecules. The technique is particularly reliable for the fluoroalkanes such as CF/sub 4/, CF/sub 3/H, C/sub 2/F/sub 6/, and C/sub 3/F/sub 8/. The total dissociation cross section for CF/sub 4/ has been measured for energies between threshold (approx.12.5 eV) and 600 eV. The magnitude of the cross section at its maximum is 5.5 x 10/sup -16/ cm/sup 2/. Less extensive data are presented for CF/sub 3/H, C/sub 2/F/sub 6/, and C/sub 3/F/sub 8/. Their cross sections at the maxima are 5.8 x 10/sup -16/ cm/sup 2/, 8.6 x 10/sup -16/ cm/sup 2/, and 1.18 x 10/sup -15/ cm/sup 2/, respectively. Arguments are presented which suggest that the total dissociation cross section for each of these gases is equal to the sum of the cross sections for excitation to all electronic and ionic states, i.e., the total cross section for electronic excitation. The results are discussed from the point of view of the Bethe theory. It is concluded that the Bethe asymptotic behavior is not yet attained in the energy range of these measurements.
- Research Organization:
- IBM Research Laboratory, San Jose, California 95193
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5575943
- Journal Information:
- Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 25:3; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CARBON TETRAFLUORIDE
COLLISIONS
CROSS SECTIONS
DATA
DISSOCIATION
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
EXPERIMENTAL DATA
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
MOLECULE COLLISIONS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
TOTAL CROSS SECTIONS
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CARBON TETRAFLUORIDE
COLLISIONS
CROSS SECTIONS
DATA
DISSOCIATION
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
EXPERIMENTAL DATA
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
MOLECULE COLLISIONS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
TOTAL CROSS SECTIONS