Determination of vibrational and rotational temperatures in highly constricted nitrogen plasmas by fitting the second positive system of N2 molecules
Highly constricted plasmas are an active research area because of their ability to generate high activity of plasma beams, which exhibit potential in applications of material processing and film deposition. In this study, optical emission spectroscopy was used to study the highly constricted nitroge...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2015-05-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4921916 |
| _version_ | 1818285499797733376 |
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| author | Q. Y. Zhang D. Q. Shi W. Xu C. Y. Miao C. Y. Ma C. S. Ren C. Zhang Z. Yi |
| author_facet | Q. Y. Zhang D. Q. Shi W. Xu C. Y. Miao C. Y. Ma C. S. Ren C. Zhang Z. Yi |
| author_sort | Q. Y. Zhang |
| collection | DOAJ |
| description | Highly constricted plasmas are an active research area because of their ability to generate high activity of plasma beams, which exhibit potential in applications of material processing and film deposition. In this study, optical emission spectroscopy was used to study the highly constricted nitrogen plasma created at low pressure. The vibrational and rotational temperatures of molecules were determined by fitting the second positive system of nitrogen molecule. Under the conditions of the power densities as high as 7 ∼ 85 W/cm3 and the pressures of 2 ∼ 200 Pa, the determined rotational temperature was found to be relatively low, increasing from 350 to 700 K and the vibrational temperature keeping at ∼ 5000 K. The analysis of dissipated power revealed that ∼ 80 % of input power is dissipated for the nitrogen molecule dissociation and the creation/loss of ions at the tube wall, producing an as high as 1012 ∼ 1013 cm−3 plasma with the nitrogen dissociation degrees of 2%∼15%. With the increase in the discharge pressure, more input power was found to be dissipated in the dissociation of nitrogen molecules instead of creation of ions, resulting in a higher density of radicals. |
| first_indexed | 2024-12-13T01:09:41Z |
| format | Article |
| id | doaj.art-c5060b9cf0b442988a55d9c23f4d358b |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-13T01:09:41Z |
| publishDate | 2015-05-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-c5060b9cf0b442988a55d9c23f4d358b2022-12-22T00:04:30ZengAIP Publishing LLCAIP Advances2158-32262015-05-0155057158057158-1110.1063/1.4921916058505ADVDetermination of vibrational and rotational temperatures in highly constricted nitrogen plasmas by fitting the second positive system of N2 moleculesQ. Y. Zhang0D. Q. Shi1W. Xu2C. Y. Miao3C. Y. Ma4C. S. Ren5C. Zhang6Z. Yi7Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, and School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Materials Modification by Laser, Ion and Electron Beams, and School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Materials Modification by Laser, Ion and Electron Beams, and School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Materials Modification by Laser, Ion and Electron Beams, and School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Materials Modification by Laser, Ion and Electron Beams, and School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, ChinaKey Laboratory of Materials Modification by Laser, Ion and Electron Beams, and School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, ChinaScience and Technology on Reliability and Environmental Engineering Laboratory, Beijing Institute of Spacecraft Environmental Engineering, Beijing 100094, ChinaScience and Technology on Reliability and Environmental Engineering Laboratory, Beijing Institute of Spacecraft Environmental Engineering, Beijing 100094, ChinaHighly constricted plasmas are an active research area because of their ability to generate high activity of plasma beams, which exhibit potential in applications of material processing and film deposition. In this study, optical emission spectroscopy was used to study the highly constricted nitrogen plasma created at low pressure. The vibrational and rotational temperatures of molecules were determined by fitting the second positive system of nitrogen molecule. Under the conditions of the power densities as high as 7 ∼ 85 W/cm3 and the pressures of 2 ∼ 200 Pa, the determined rotational temperature was found to be relatively low, increasing from 350 to 700 K and the vibrational temperature keeping at ∼ 5000 K. The analysis of dissipated power revealed that ∼ 80 % of input power is dissipated for the nitrogen molecule dissociation and the creation/loss of ions at the tube wall, producing an as high as 1012 ∼ 1013 cm−3 plasma with the nitrogen dissociation degrees of 2%∼15%. With the increase in the discharge pressure, more input power was found to be dissipated in the dissociation of nitrogen molecules instead of creation of ions, resulting in a higher density of radicals.http://dx.doi.org/10.1063/1.4921916 |
| spellingShingle | Q. Y. Zhang D. Q. Shi W. Xu C. Y. Miao C. Y. Ma C. S. Ren C. Zhang Z. Yi Determination of vibrational and rotational temperatures in highly constricted nitrogen plasmas by fitting the second positive system of N2 molecules AIP Advances |
| title | Determination of vibrational and rotational temperatures in highly constricted nitrogen plasmas by fitting the second positive system of N2 molecules |
| title_full | Determination of vibrational and rotational temperatures in highly constricted nitrogen plasmas by fitting the second positive system of N2 molecules |
| title_fullStr | Determination of vibrational and rotational temperatures in highly constricted nitrogen plasmas by fitting the second positive system of N2 molecules |
| title_full_unstemmed | Determination of vibrational and rotational temperatures in highly constricted nitrogen plasmas by fitting the second positive system of N2 molecules |
| title_short | Determination of vibrational and rotational temperatures in highly constricted nitrogen plasmas by fitting the second positive system of N2 molecules |
| title_sort | determination of vibrational and rotational temperatures in highly constricted nitrogen plasmas by fitting the second positive system of n2 molecules |
| url | http://dx.doi.org/10.1063/1.4921916 |
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