Electron Swarm Parameters in Water Vapor
نویسندگان
چکیده
Electron swarm parameters, such as the drift velocity and the ionization coefficient, in water vapor have been measured for relatively wide ranges in reduced electric fields (E/N) at room temperature. The drift velocity (Wm) was obtained based upon the arrival-time spectra of electrons by using a double-shutter drift tube for the E/N from 60 to 1000 Td, while the first and second ionization coefficients (α and γ) were determined by the steady-state Townsend (SST) method from 50 to 3000 Td. The comparison between the results and other data in the literature shows that our results for both the drift velocity and the effective ionization coefficient are lower than those of the other data in the above ranges. PACS numbers: 51.50.+v, 52.80.-s, 52.20.Fs, 34.80.-i *Corresponding author: H. Date Postal address: N12-W5, Kita-ku, Sapporo 060-0812, JAPAN Email address: [email protected] Tel: +81-11-706-3423, Fax: +81-11-706-4916
منابع مشابه
Numerical Study of Spherical Vapor Layer Growth Due to Contact of a Hot Object and Water
Vapor film formation and growth due to contact of a hot body and other liquids arise in some industrial applications including nuclear fuel rods, foundry and production of paper. The possibility of a steam explosion remains in most of these cases which could result in injuries and financial damage. Due to the importance of such phenomenon, this study deals with vapor layer forming, growth, and ...
متن کاملPulse Townsend Measurement of Electron Swarm Parameters at Low Pressure
The pulse Townsend method was used to investigate electron swarm at more than 665 mbar. We introduced a new convenient way to obtain swarm parameters from the experiments at less than 133 mbar. The validity of the new presented method was confirmed by the Monte Carlo simulation. This method was applied to obtain swarm parameters in nitrogen at pressure region from 0.532 to 6.65 mbar. The result...
متن کاملFacile Fabrication of Boron-Doped Titania Nanopowders by Atmospheric Pressure Chemical Vapor Synthesis Route and its Photocatalytic Activity
The Atmospheric Pressure Chemical Vapor Synthesis (APCVS) route is a process that can be used for the synthesis of doped-nanocrystalline powders with very small crystallite sizes having a narrow particle size distribution and high purity. In this study, APCVS technique was used to prepare boron-doped titania nanopowders. The effects of temperature, borate flow rate and water flow rate on the am...
متن کاملProperties of Chemically Modified Gelatin Films
Edible and/or biodegradable films usually have limited water vapor barriers, making it difficult to use them. Thus, the objective of this work was to evaluate the effect of a chemical reticulation treatment with formaldehyde and glyoxal on the mechanical properties, water vapor permeability, solubility and color parameters of gelatin-based films. Formaldehyde and glyoxal were added to the filmo...
متن کاملChemical Vapor Deposition Synthesis of Novel Indium Oxide Nanostructures in Strongly Reducing Growth Ambient
The current study reports some interesting growth of novel In2O3 nanostructures using ambient-controlled chemical vapor deposition technique in the presence of a strongly reducing hydrazine ambient. The experiments are systematically carried out by keeping either of the carrier gas flow rate or the source temperature constant, and varying the other. For each of the depositions, the growth is st...
متن کامل