THE STOPPING CROSS SECTIONS OF HYDROCARBON GASES. Thesis
Thesis/Dissertation
·
OSTI ID:4124024
The stopping cross sections of air, helium, acetylene, cyclopropane, ethylene, methane, propane, and propylene were measured for proton energies 40 to 240 kev. The stopping cross sections of ethylene and propane were measured for helium ions. The standard deviations of the measurements vary between 1.5 and 4%. The failure of the Bragg rule of additivity for the stopping cross sections of hydrocarbon vapors for proton energies of less than 150 kev was clearly illustrated both by a general analysis of the data and by consideration of the stopping cross sections of propylene and cyclopropane, which have the same chemical constituents. The stopping cross sections of the hydrocarbon gases for protons were in agreement with a previously proposed additivity rule and give further indications of its validity. Using this rule the stopping cross sections of electrons in the various chemical bonds were calculated from the measured molecular stopping cross sections. These electron cross sections permit the calculations of stopping cross sections for other organic compounds with an accuracy which, in most cases, is comparable with the accuracy of the measured cross sections. Comparison of helium ion and proton stopping cross sections of solids and vapors revealed interesting features that may reflect either differences in the stopping characteristics of solids and vapors, or stopping effects of chemical binding that depend on the incident ion. The helium ion stopping cross sections also indicate that the effect of chemical binding on stopping cross sections is unlikely to be any greater for incident helium ions than for incident protons at the same energy. (TCO)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-18-004617
- OSTI ID:
- 4124024
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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