Electron-stimulated desorption from partially fluorinated hydrocarbon thin films: Molecules with common versus separate hydrogen and fluorine bonding sites
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
We have observed H/sup +/ and F/sup +/ yields as a function of low-energy (10--100 eV) electron bombardment from thin films of solid nonafluoroisobutane ((CF/sub 3/)/sub 3/CH), 1,2,3,5-tetrafluorobenzene (C/sub 6/H/sub 2/F/sub 4/), 1-fluorobutane (C/sub 4/H/sub 9/F), and fluorocyclohexane (C/sub 6/H/sub 11/F). For the materials with separate H and F bonding sites (C/sub 6/H/sub 2/F/sub 4/ and (CF/sub 3/)/sub 3/CH), H/sup +/ and F/sup +/ have different appearance potentials, corresponding, respectively, to excitations of the C 2s and F 2s levels (approx.25 and approx.40 eV). For the materials with common H and F bonding sites, the H/sup +/ and F/sup +/ appearance potentials correspond to excitation of the C 2s level. The F/sup +/ threshold is relatively weak, and a steep increase in the F/sup +/ yield is observed near 40 eV (F 2S excitation). These results indicate that the final-state excitations leading to ion desorption in these systems are localized within functional groups but not necessarily within individual C--H or C--F bonds of the functional group.
- Research Organization:
- Sandia National Laboratories, Albuquerque, New Mexico 87185
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6457376
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 30:1; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Tue Dec 30 23:00:00 EST 1997
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OSTI ID:560030
Related Subjects
36 MATERIALS SCIENCE
360605* -- Materials-- Radiation Effects
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKANES
AROMATICS
BENZENE
BUTANE
CHARGED PARTICLES
COLLISIONS
DESORPTION
ELECTRON COLLISIONS
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EXCITED STATES
FILMS
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINE IONS
HALOGENATED ALIPHATIC HYDROCARBONS
HEXANE
HYDROCARBONS
HYDROGEN IONS
IONS
LOW TEMPERATURE
MASS SPECTROMETERS
MEASURING INSTRUMENTS
MULTIPOLES
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PULSE TECHNIQUES
QUADRUPOLES
SPECTROMETERS
ULTRAHIGH VACUUM
360605* -- Materials-- Radiation Effects
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKANES
AROMATICS
BENZENE
BUTANE
CHARGED PARTICLES
COLLISIONS
DESORPTION
ELECTRON COLLISIONS
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EXCITED STATES
FILMS
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINE IONS
HALOGENATED ALIPHATIC HYDROCARBONS
HEXANE
HYDROCARBONS
HYDROGEN IONS
IONS
LOW TEMPERATURE
MASS SPECTROMETERS
MEASURING INSTRUMENTS
MULTIPOLES
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PULSE TECHNIQUES
QUADRUPOLES
SPECTROMETERS
ULTRAHIGH VACUUM