IONIZATION BY PROTONS IN THE ENERGY RANGE 100 TO 450 kev
Ionization at 100 to 450 kev was investigated by the well-known parallel- plate condenser method. A uniform axial magnetic field enables slow ion collection to be carried out over a precisely determined path length at pressures low enough to ensure single collision conditions. The total cross-section for slow ion production sigma ₊, and the total ionization cross-section sigma e were determined for protons in hydrogen, helium, neon, argon, and krypton. It is found that charge transfer is very small above about 200 kev so that sigma ₊ approx equal = sigma e. The ionization cross-section for all cases falls off as E⁻¹ log E where E is the energy of the relative ionization cross-sections for the same relative velocity of impact. The results are therefore in agreement with the general predictions of the Born approximation. (auth)
- Research Organization:
- University Coll., London
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-032790
- OSTI ID:
- 4677558
- Journal Information:
- Proc. Roy. Soc. (London), Ser. A, Journal Name: Proc. Roy. Soc. (London), Ser. A Vol. Vol: 274
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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