Observation of Thermal Electron Detachment from Cyclo-C4F8 in FALP experiments

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Abstract:

The methodology for use of a flowing afterglow-Langmuir probe apparatus to measure thermal electron detachment rate coefficients is described. We determined the thermal detachment rate coefficient 1010 or - 300s for cyclo-C4F-8 ions and the rate coefficient 1.6 or - 0.5 x 10exp -8cu cms for electron attachment of cyclo-C4F8 at 375 K. The sole ionic product of attachment is cyclo-C4F-8. The equilibrium constant for the attachment detachment reaction yields a free energy for attachment at 375 K of -0.63 or - 0.02 eV, from which we estimate the electron affinity O K value Of Cyclo-C4F8 to be about 0.63 eV. Electron attachment, Electron detachment, Cyclo perfluorobutane

Author(s):
Miller, Thomas M. ; Morris, Robert A. ; Miller, Amy E. ; Viggiano, A. A. ; Paulson, John F.
Author Organization(s):
PHILLIPS LAB HANSCOM AFB MA
Annotation:
Reprint: Observation of Thermal Electron Detachment from Cyclo-C4F8 in FALP Experiment.
Pagination:
0015

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release, Document Partially Illegible
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited. Document Partially Illegible.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
PL-TR-94-2257, PL*-TR-94-2257
Task Number(s):
6J
Project Number(s):
2303
Monitor Series:
TR-94-2257, PL/HANSCOM
 Subject Terms
Joint Capability Areas:
JCA_1.2.7_Experimentation; JCA_5.3_Planning; JCA_5_Command and Control; JCA_1.2.3_Educating; JCA_4.5.4_Requirements Definition; JCA_4.5_Operational Contract Support; JCA_1.2.5_Lessons Learned
Modernization Areas:
Quantum Science and Computing
Communities of Interest:
Materials and Manufacturing Processes
Descriptor(s):
*THERMAL PROPERTIES, *ELECTRONS, *FLUORINE, *BUTANES, *CYCLIC COMPOUNDS, IONS, REPRINTS, METHODOLOGY, CONSTANTS, LANGMUIR PROBES, ANIONS, AFTERGLOWS, MASS SPECTROMETRY, FREE ENERGY, ATTACHMENT, COEFFICIENTS, PROBES, PLASMAS(PHYSICS), RATES, ESTIMATES
Field(s)/Group(s):
Organic Chemistry, Nuclear Physics and Elementary Particle Physics, Plasma Physics and Magnetohydrodynamics, Thermodynamics
Keyword(s):
*DETACHMENT, FALP(FLOWING AFTERGLOW LANGMUIR PROBES), FLOWING AFTERGLOW, NEGATIVE IONS, AFFINITY, OCTAFLUOROCYCLOBUTANE, CYCLO PERFLUORO BUTANE, WUPL23036J01
Report Date:
1993 Jan 01