Mass Spectrometric Observations of the Ionic Species in a Double Dielectric Barrier Discharge Operating in Nitrogen
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- 作者：Zaenab Abd-Allah ; David A. G. Sawtell ; Glen T. West ; Peter J. Kelly and James W. Bradley
- 刊名：Plasma Processes and Polymers
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：13
- 期：6
- 页码：649-653
- 全文大小：1688K
- ISSN：1612-8869
文摘
Negative and positive ions generated in an atmospheric-pressure DBD with double dielectrics were identified and their relative intensities characterized with variation of water vapor concentration in the discharge, gas residence time, and inter-electrode spacing. The most abundant negative ions were O−, OH−, CN−, CNO−, math-equation-construct">mage="true" class="math-equation-image">mathml="true" class="math-equation-mathml" style="display:none"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mrow xmlns:w="http://www.wiley.com/namespaces/wiley" xmlns:wiley="http://www.wiley.com/namespaces/wiley/wiley" xmlns:cr="urn://wiley-online-library/content/render" xmlns="http://www.w3.org/1998/Math/MathML"><msubsup><mrow><mi mathvariant="normal">Nmi><mi mathvariant="normal">Omi>mrow><mrow><mn>2mn>mrow><mo>−mo>msubsup>mrow>mml:math>, math-equation-construct">mage="true" class="math-equation-image">mathml="true" class="math-equation-mathml" style="display:none"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mrow xmlns:w="http://www.wiley.com/namespaces/wiley" xmlns:wiley="http://www.wiley.com/namespaces/wiley/wiley" xmlns:cr="urn://wiley-online-library/content/render" xmlns="http://www.w3.org/1998/Math/MathML"><msubsup><mrow><mi mathvariant="normal">Nmi><mi mathvariant="normal">Omi>mrow><mrow><mn>2mn>mrow><mo>−mo>msubsup><mo stretchy="false">(mo><msub><mi mathvariant="normal">Hmi><mrow><mn>2mn>mrow>msub><mi mathvariant="normal">Omi><mo stretchy="false">)mo>mrow>mml:math>, and math-equation-construct">mage="true" class="math-equation-image">mathml="true" class="math-equation-mathml" style="display:none"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mrow xmlns:w="http://www.wiley.com/namespaces/wiley" xmlns:wiley="http://www.wiley.com/namespaces/wiley/wiley" xmlns:cr="urn://wiley-online-library/content/render" xmlns="http://www.w3.org/1998/Math/MathML"><msubsup><mrow><mi mathvariant="normal">Nmi><mi mathvariant="normal">Omi>mrow><mrow><mn>3mn>mrow><mo>−mo>msubsup>mrow>mml:math> while the positive ions were dominated by N+, math-equation-construct">mage="true" class="math-equation-image">mathml="true" class="math-equation-mathml" style="display:none"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mrow xmlns:w="http://www.wiley.com/namespaces/wiley" xmlns:wiley="http://www.wiley.com/namespaces/wiley/wiley" xmlns:cr="urn://wiley-online-library/content/render" xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">Cmi><msup><mrow><msub><mi mathvariant="normal">Hmi><mrow><mn>2mn>mrow>msub>mrow><mo>+mo>msup>mrow>mml:math>, math-equation-construct">mage="true" class="math-equation-image">mathml="true" class="math-equation-mathml" style="display:none"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mrow xmlns:w="http://www.wiley.com/namespaces/wiley" xmlns:wiley="http://www.wiley.com/namespaces/wiley/wiley" xmlns:cr="urn://wiley-online-library/content/render" xmlns="http://www.w3.org/1998/Math/MathML"><msubsup><mi mathvariant="normal">Nmi><mrow><mn>2mn>mrow><mo>+mo>msubsup>mrow>mml:math>, CO+, HCO+, N2H+, O2+, H+(H2O)m>n m>, CNO+, and CN2O+. Increasing the water concentration in the discharge led to an increase in the intensity of H+(H2O)m>n m>, math-equation-construct">mage="true" class="math-equation-image">mathml="true" class="math-equation-mathml" style="display:none"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mrow xmlns:w="http://www.wiley.com/namespaces/wiley" xmlns:wiley="http://www.wiley.com/namespaces/wiley/wiley" xmlns:cr="urn://wiley-online-library/content/render" xmlns="http://www.w3.org/1998/Math/MathML"><msubsup><mrow><mi mathvariant="normal">Nmi><mi mathvariant="normal">Omi>mrow><mrow><mn>2mn>mrow><mo>−mo>msubsup>mrow>mml:math> and its hydrated clusters, while the intensity of all carbon containing species decreased. Increasing the residence time of the species in the plasma region decreased the concentration of O−, OH−, and math-equation-construct">mage="true" class="math-equation-image">mathml="true" class="math-equation-mathml" style="display:none"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mrow xmlns:w="http://www.wiley.com/namespaces/wiley" xmlns:wiley="http://www.wiley.com/namespaces/wiley/wiley" xmlns:cr="urn://wiley-online-library/content/render" xmlns="http://www.w3.org/1998/Math/MathML"><msubsup><mrow><mi mathvariant="normal">Nmi><mi mathvariant="normal">Omi>mrow><mrow><mn>2mn>mrow><mo>−mo>msubsup>mrow>mml:math>, while the concentration of math-equation-construct">mage="true" class="math-equation-image">mathml="true" class="math-equation-mathml" style="display:none"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mrow xmlns:w="http://www.wiley.com/namespaces/wiley" xmlns:wiley="http://www.wiley.com/namespaces/wiley/wiley" xmlns:cr="urn://wiley-online-library/content/render" xmlns="http://www.w3.org/1998/Math/MathML"><msubsup><mrow><mi mathvariant="normal">Nmi><mi mathvariant="normal">Omi>mrow><mrow><mn>3mn>mrow><mo>−mo>msubsup>mrow>mml:math> increased. Changing the inter-electrodes spacing did not have any effect on the formation of ionic species in the discharge.