STOPPING OF LOW-ENERGY H$sup +$ AND He$sup +$ IONS IN PLASTICS
The stopping cross scctions of polystyrenes, polyethylene, and Pliolite S--5A for 40- to 340-kev H/sup +/ and He/sup +/ ions were measured. A nearly monoencrgetic analyzed beam of ions of known energy was deflected 90 in the field of a magnetic spectrometer. A thin film of the stopping material was placed in the beam path at thc spectrometer entrance. The energy loss of the beam was determined by measuring the decrease in magnetic field necessary to restore the beam to the 90 deflection angle. The film thickness was obtained by weighing a known area of film. The probable errors in the measurements are 2.3--2.8% for H/sup +/ and 3--4% for He/sup +/. Proton stopping cross-section measurements on gold with this equipment agree with the resuits obtained by Bader, Pixley, Mozers and Whaling. Above 75 kev the He/sup +/ cross sections vary linearly with the ion velocity. (auth)
- Research Organization:
- Univ. of Nebraska, Lincoln
- NSA Number:
- NSA-13-013806
- OSTI ID:
- 4251987
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 113; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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