Characterization by laser-induced photodetachment of anions formed during dust particle growth in a magnetically confined very low-pressure argon–acetylene plasma
| Autor: | Joëlle Margot, Richard Clergereaux, Ahmad Hamdan, Georges Al Makdessi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
education.field_of_study Argon Population chemistry.chemical_element Plasma Condensed Matter Physics 01 natural sciences Magnetic field Ion chemistry.chemical_compound Acetylene chemistry Collision frequency Torr 0103 physical sciences Atomic physics education 010303 astronomy & astrophysics |
| Zdroj: | Plasma Sources Science and Technology. 26:085001 |
| ISSN: | 1361-6595 |
| DOI: | 10.1088/1361-6595/aa7806 |
| Popis: | Anions in low-pressure magnetically confined Ar–C2H2 plasmas were investigated using the laser-induced photodetachment technique. In particular, the influence of the magnetic field (B) was studied. We observed that the density of negatively-charged species n – increases with B and slightly decreases when the C2H2 percentage grows. These phenomena are the result of changes in the plasma kinetics. We also observed that n – decreases as the pressure increases from 2 to 10 mTorr due to the corresponding rise of the collision frequency, which leads to enhanced losses of the negatively-charged species. In parallel, the photodetachment cross-section was deduced from the energy dependence of the photodetachment signal and was found to be close to that of C2H− anions, which indicates that these anions are likely to dominate the negative ion population. |
| Databáze: | OpenAIRE |
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