dorsal/arxiv
View SchemaEvidence of catalytic production of hot hydrogen in rf generated hydrogen/argon plasmas
| Authors | Jonathan Phillips, Chun-Ku Chen, Kamran Akhtar, Bala Dhandapani, Randell Mills |
|---|---|
| Categories | |
| ArXiv ID | physics/0509003 |
| URL | https://arxiv.org/abs/physics/0509003 |
Abstract
In this paper the selective broadening of the atomic hydrogen lines in pure H2 and Ar/H2 mixtures in a large 'GEC' cell (36 cm length_ 14 cm ID) was mapped as a function of position, H2/Ar ratio, time, power, and pressure. Several observations regarding the selective line broadening were particularly notable as they are unanticipated on the basis of earlier models. First, the anomalous broadening of the Balmer lines was found to exist throughout the plasma, and not just in the region between the electrodes. Second, the broadening was consistently a complex function of the operating parameters particularly gas composition (highest in pure H2), position, power, time and pressure. Clearly not anticipated by earlier models were the findings that under some conditions the highest concentration of 'hot' (>10 eV) hydrogen was found at the entry end, and not in the high field region between the electrodes and that in other conditions, the hottest H was at the (exit) pump (also grounded electrode) end. Third, excitation and electron temperatures were less than one eV in all regions of the plasma not directly adjacent (>1mm) to the electrodes, providing additional evidence that the energy for broadening, contrary to standard models, is not obtained from the field. Fourth, in contrast to our earlier studies of hydrogen/helium and water plasmas, we found that in some conditions 98% of the atomic hydrogen was in the 'hot' state throughout the GEC-type cell. Virtually every operating parameter studied impacted the character of the hot H atom population, and clearly second and third order effects exist, indicating a need for experimental design. Some non-field mechanisms for generating hot hydrogen atoms, specifically those suggested by Mills' CQM model, are outlined.
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"abstract": "In this paper the selective broadening of the atomic hydrogen lines in pure\nH2 and Ar/H2 mixtures in a large \u0027GEC\u0027 cell (36 cm length_ 14 cm ID) was mapped\nas a function of position, H2/Ar ratio, time, power, and pressure. Several\nobservations regarding the selective line broadening were particularly notable\nas they are unanticipated on the basis of earlier models. First, the anomalous\nbroadening of the Balmer lines was found to exist throughout the plasma, and\nnot just in the region between the electrodes. Second, the broadening was\nconsistently a complex function of the operating parameters particularly gas\ncomposition (highest in pure H2), position, power, time and pressure. Clearly\nnot anticipated by earlier models were the findings that under some conditions\nthe highest concentration of \u0027hot\u0027 (\u003e10 eV) hydrogen was found at the entry\nend, and not in the high field region between the electrodes and that in other\nconditions, the hottest H was at the (exit) pump (also grounded electrode) end.\nThird, excitation and electron temperatures were less than one eV in all\nregions of the plasma not directly adjacent (\u003e1mm) to the electrodes, providing\nadditional evidence that the energy for broadening, contrary to standard\nmodels, is not obtained from the field. Fourth, in contrast to our earlier\nstudies of hydrogen/helium and water plasmas, we found that in some conditions\n98% of the atomic hydrogen was in the \u0027hot\u0027 state throughout the GEC-type cell.\nVirtually every operating parameter studied impacted the character of the hot H\natom population, and clearly second and third order effects exist, indicating a\nneed for experimental design. Some non-field mechanisms for generating hot\nhydrogen atoms, specifically those suggested by Mills\u0027 CQM model, are outlined.",
"arxiv_id": "physics/0509003",
"authors": [
"Jonathan Phillips",
"Chun-Ku Chen",
"Kamran Akhtar",
"Bala Dhandapani",
"Randell Mills"
],
"categories": [
"physics.plasm-ph"
],
"title": "Evidence of catalytic production of hot hydrogen in rf generated hydrogen/argon plasmas",
"url": "https://arxiv.org/abs/physics/0509003"
},
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