Absolute Electron Excitation Cross Sections of Helium
- 18 May 1964
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 134 (4A), A888-A897
- https://doi.org/10.1103/physrev.134.a888
Abstract
The absolute apparent electron excitation functions of helium have been measured for the , , , , , , , , , , , , , , , , , and states at pressures sufficiently low so that the effects of radiation imprisonment and collisional excitation transfer can be neglected. Corrections due to polarization of the radiation and the cascading from the upper excited states have been applied to the experimental data and the true excitation functions obtained. The peak values and the shape of these excitation functions are compared with the results reported from other laboratories. Generally good agreement is found with the previous works where the collisional excitation transfer was properly reduced and allowance was made for the cascading effect. The experimental cross sections show satisfactory agreement with the theoretical values calculated by the Born approximation for the and states at high-electron energies, but are about four times larger than the theoretical values for states. In the case of...
Keywords
This publication has 19 references indexed in Scilit:
- Collisional Excitation Transfer to theState in Helium by Multiple State MechanismPhysical Review B, 1962
- System for Processing and Recording Excitation Function DataReview of Scientific Instruments, 1962
- Theory of collision transfer of excitation in heliumAnnals of Physics, 1961
- New Process of Excitation Transfer in HeliumPhysical Review B, 1961
- Excitation processes in heliumProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1960
- Excitation Function of Helium 3^1P for Electron CollisionsJournal of the Optical Society of America, 1960
- Spectral Emissivity of Tungsten†Journal of the Optical Society of America, 1959
- The polarization of atomic line radiation excited by electron impactPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1958
- The excitation function of heliumProceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1932
- Lichtausbeute im Helium-, Quecksilber- und Stickstoffspektrum bei Anregung durch ElektronenstoßThe European Physical Journal A, 1932