Absolute electron impact ionization cross sections of Li in the energy range from 100 to 2000 eV
| Autor: | R. Hagemann, R. Botter, R. Jalin |
|---|---|
| Rok vydání: | 1973 |
| Předmět: |
Condensed Matter::Quantum Gases
Range (particle radiation) Chemistry General Physics and Astronomy chemistry.chemical_element Molar ionization energies of the elements Ion source Ion Ionization Lithium Physics::Atomic Physics Physical and Theoretical Chemistry Atomic physics Beam (structure) Electron ionization |
| Zdroj: | The Journal of Chemical Physics. 59:952-959 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.1680119 |
| Popis: | The absolute electron impact ionization cross sections for lithium in the energy range between 100 and 2000 eV were measured by the nonmodulated crossed beam technique. The neutral lithium beam is produced by a Knudsen cell and crossed at right angles with the electron beam. The ions formed are collected on a plate and their intensity determined with a dc amplifier. The neutral beam is condensed on a cold trap cooled with liquid nitrogen, this temperature being much lower than that required to obtain total condensation. The amount of metal deposited is measured by the isotopic dilution technique and by atomic absorption, and the density of the atoms in the neutral beam is calculated. The total absolute ionization cross sections can then be determined. All possible errors have been carefully analyzed and their magnitudes estimated. The absolute ionization cross section for Li at an energy of 500 eV is QLi=0.358 × 10−16 cm2. This value is half of that obtained by McFarland and Kinney. The partial ionization... |
| Databáze: | OpenAIRE |
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