Nitrogen oxide removal dynamic process through 15 Ns DBD technique

2015 ◽  
Vol 29 (12) ◽  
pp. 1550053
Author(s):  
Xiaojun Wang ◽  
Lianshui Zhang ◽  
Weidong Lai ◽  
Fengliang Liu
Keyword(s):  
Electron Impact ◽  
Impact Ionization ◽  
Pulse Discharge ◽  
Emission Spectra ◽  
Dissociative Recombination ◽  
Dissociative Excitation ◽  
Dbd Plasma ◽  
Time Resolved ◽  
No Removal ◽  
Oxide Removal

Nitrogen oxides exhaust gas assumes the important responsibility on air pollution by forming acid rain. This paper discusses the NO removal mechanism in 15 ns pulse dielectric barrier discharge (DBD) plasma through experimental and simulating method. Emission spectra collected from plasma are evaluated as sourced from N + and O (3 P ). The corresponding zero-dimensional model is established and verified through comparing the simulated concentration evolution and the experimental time-resolved spectra of N +. The electron impact ionization plays major role on NO removal and the produced NO + are further decomposed into N + and O (3 P ) through electron impact dissociative excitation rather than the usual reported dissociative recombination process. Simulation also indicates that the removal process can be accelerated by NO inputted at lower initial concentration or electrons streamed at higher concentration, due to the heightened electron impact probability on NO molecules. The repetitive pulse discharge is a benefit for improving the NO removal efficiency by effectively utilizing the radicals generated from the previous pulse under the condition that the pulse period should be shorter enough to ignore the spatial diffusion of radicals. Finally, slight attenuation on NO removal has been experimentally and simulatively observed after N 2 mixed, due to the competitive consumption of electrons.

Population of 3s, 3p, and 3d Sublevels of Atomic Hydrogen after Dissociative Excitation of some Alkanes by Electron Impact

1977 ◽  
Vol 32 (7) ◽  
pp. 720-723 ◽  
Author(s):  
H. J. Hartfuß ◽  
H. Röll
Keyword(s):  
Electron Impact ◽  
Atomic Hydrogen ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Dissociative Excitation ◽  
Balmer Line ◽  
Time Resolved ◽  
Target Molecule ◽  
Intensity Ratios

AbstractThe intensity ratios within the Balmer-line Hα have been determined after pulsed electron impact excitation and dissociation of the alkanes CH4, C5H12, C6H14, C7H16, C8H18 and C9H20 . A time resolved technique has been used to separate the line-components by their different life­ times. No contribution of the 3p-level to the intensity of Hα could be detected, as was found earlier in the case of some other hydrogen containing molecules 2, 3. The ratio of the intensity contribution originating in 3s population to the total Ha intensity was found to be between 0.57 and 0.66 de­pending on the target molecule.

Dissociative excitation of molecules electron impact

1980 ◽  
Vol 77 ◽  
pp. 773-777 ◽  
Author(s):  
F.J. de Heer ◽  
H.A. Van Sprang ◽  
G.R. Mohlmann
Keyword(s):  
Electron Impact ◽  
Dissociative Excitation

scholarly journals Low-energy electron impact dissociative recombination and vibrational transitions of N2+

2021 ◽  
Vol 129 (5) ◽  
pp. 053303
Author(s):  
A. Abdoulanziz ◽  
C. Argentin ◽  
V. Laporta ◽  
K. Chakrabarti ◽  
A. Bultel ◽  
...  
Keyword(s):  
Electron Impact ◽  
Dissociative Recombination ◽  
Low Energy ◽  
Energy Electron ◽  
Low Energy Electron ◽  
Vibrational Transitions

scholarly journals Few Body Effects in the Electron and Positron Impact Ionization of Atoms

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 33
Author(s):  
R.I. Campeanu ◽  
Colm T. Whelan
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Differential Cross ◽  
Impact Ionization ◽  
Inert Gas ◽  
Interference Effects ◽  
Positron Impact ◽  
Competing Interactions ◽  
Energy Sharing

Triple differential cross sections (TDCS) are presented for the electron and positron impact ionization of inert gas atoms in a range of energy sharing geometries where a number of significant few body effects compete to define the shape of the TDCS. Using both positrons and electrons as projectiles has opened up the possibility of performing complementary studies which could effectively isolate competing interactions that cannot be separately detected in an experiment with a single projectile. Results will be presented in kinematics where the electron impact ionization appears to be well understood and using the same kinematics positron cross sections will be presented. The kinematics are then varied in order to focus on the role of distortion, post collision interaction (pci), and interference effects.

scholarly journals Low-energy electron-impact ionization of helium

1998 ◽  
Vol 57 (5) ◽  
pp. R3161-R3164 ◽  
Author(s):  
Igor Bray ◽  
Dmitry V. Fursa ◽  
J. Röder ◽  
H. Ehrhardt
Keyword(s):  
Electron Impact ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Low Energy ◽  
Energy Electron ◽  
Low Energy Electron

scholarly journals A physico-chemical model to study the ion density distribution in the inner coma of comet C/2016 R2 (Pan-STARRS)

2020 ◽  
Author(s):  
Susarla Raghuram ◽  
Anil Bhardwaj ◽  
Damien Hutsemékers ◽  
Cyrielle Opitom ◽  
Jean Manfroid ◽  
...  
Keyword(s):  
Density Distribution ◽  
Electron Impact ◽  
Emission Intensity ◽  
Impact Ionization ◽  
Excitation Source ◽  
Resonance Fluorescence ◽  
Ion Density ◽  
Physico Chemical ◽  
Intensity Ratios ◽  
Ion Emission

Abstract The recent observations show that comet C/2016 R2 (Pan-Starrs) has a unique and peculiar composition when compared with several other comets observed at 2.8 au heliocentric distance. Assuming solar resonance fluorescence is the only excitation source, the observed ionic emission intensity ratios are used to constrain the corresponding neutral abundances in this comet. We developed a physico-chemical model to study the ion density distribution in the inner coma of this comet by accounting for photon and electron impact ionization of neutrals, charge exchange and proton transfer reactions between ions and neutrals, and electron-ion thermal recombination reactions. Our calculations show that CO$_2^+$ and CO+ are the major ions in the inner coma, and close to the surface of nucleus CH3OH+, CH3OH$_2^+$ and O$_2^+$ are also important ions. By considering various excitation sources, we also studied the emission mechanisms of different excited states of CO+, CO$_2^+$, N$_2^+$, and H2O+. We found that the photon and electron impact ionization and excitation of corresponding neutrals significantly contribute to the observed ionic emissions for radial distances smaller than 300 km and at larger distances, solar resonance fluorescence is the major excitation source. Our modelled ion emission intensity ratios are consistent with the ground-based observations. Based on the modelled emission processes, we suggest that the observed ion emission intensity ratios can be used to derive the neutral composition in the cometary coma only when the ion densities are significantly controlled by photon and photoelectron impact ionization of neutrals rather than by the ion-neutral chemistry.

Optical, electrochemical and third-order nonlinear optical studies of triphenylamine substituted zinc phthalocyanine

2016 ◽  
Vol 20 (08n11) ◽  
pp. 1173-1181 ◽  
Author(s):  
Narra Vamsi Krishna ◽  
Puliparambil Thilakan Anusha ◽  
S. Venugopal Rao ◽  
L. Giribabu
Keyword(s):  
Nonlinear Optical ◽  
Emission Spectra ◽  
Optical Emission ◽  
Soret Band ◽  
Laser Pulses ◽  
Zinc Phthalocyanine ◽  
Third Order ◽  
Time Resolved ◽  
Nlo Properties ◽  
Scan Data

Zinc phthalocyanine possessing triphenylamine at its peripheral position has been synthesized and its optical, emission, electrochemical and third-order nonlinear optical (NLO) properties were investigated. Soret band was broadened due to the presence of triphenylamine moiety. Electrochemical properties indicated that both oxidation and reduction processes were ring centered. Emission spectra were recorded in different solvents and the fluorescence yields obtained were in the range of 0.02–0.17 while the time-resolved fluorescence data revealed radiative lifetimes of typically few ns. Third-order NLO properties of this molecule have been examined using the Z-scan technique with picosecond (ps) and femtoseocnd (fs) pulses. Closed and open aperture Z-scan data were recorded with 2 ps/1 50 fs laser pulses at a wavelength of 800 nm and NLO coefficients were extracted from both the data. Our data clearly suggests the potential of this molecule for photonics applications.

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