کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1780983 | 1523928 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Monte Carlo model for electron degradation in methane gas
ترجمه فارسی عنوان
مدل مونت کارلو برای تخریب الکترون در گاز متان
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
اتمسفرهای سیاره ای، فرآیندهای مولکولی، مدل مونت کارلو، تخریب الکترون، متان،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی
We present a Monte Carlo model for degradation of 1-10,000Â eV electrons in an atmosphere of methane. The electron impact cross sections for CH4 are compiled and analytical representations of these cross sections are used as input to the model.“Yield spectra”, which provides information about the number of inelastic events that have taken place in each energy bin, is used to calculate the yield (or population) of various inelastic processes. The numerical yield spectra, obtained from the Monte Carlo simulations, is represented analytically, thus generating the Analytical Yield Spectra (AYS). AYS is employed to obtain the mean energy per ion pair and efficiencies of various inelastic processes. Mean energy per ion pair for neutral CH4 is found to be 26 (27.8) eV at 10 (0.1) keV. Efficiency calculation showed that ionization is the dominant process at energies >50eV, for which more than 50% of the incident electron energy is used. Above 25Â eV, dissociation has an efficiency of â¼27%. Below 10Â eV, vibrational excitation dominates. Contribution of emission is around 1.2% at 10Â keV. Efficiency of attachment process is â¼0.1% at 8Â eV and efficiency falls down to negligibly small values at energies greater than 15Â eV. The efficiencies can be used to calculate volume production rate in planetary atmospheres by folding with electron production rate and integrating over energy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Planetary and Space Science - Volume 111, June 2015, Pages 34-43
Journal: Planetary and Space Science - Volume 111, June 2015, Pages 34-43
نویسندگان
Anil Bhardwaj, Vrinda Mukundan,