| Autor: |
Jobe, John D., St. John, Robert M. |
| Zdroj: |
Journal of the Optical Society of America (1917-1983); December 1967, Vol. 57 Issue: 12 p1449-1451, 3p |
| Abstrakt: |
Recent studies of the population processes of the 4F state in helium by observation of the infrared radiation from this state have given direct experimental evidence for the 4^1P to 4F excitation-transfer process. The behavior of the apparent cross sections of the 4^1P and 4F states with pressure is used to evaluate the cross section for the excitation transfer and the cross section for electronic excitation to the 4F state. Analysis of the data indicates a cross section of 1.5 × 10^−14 cm^2 for the 4^1P to 4F transfer and 1.6 × 10^−19 cm^2 at 100 eV for the electron excitation plus cascade of the 4F state. Apparent cross sections of the 4F state are presented at high and low pressures from onset to 450 eV. At high pressure the apparent cross section is similar to that of the 4^1P state. As the pressure is lowered, the shape of the excitation function approaches that of a ^1D state. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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