skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Approximation of the characteristics of ion drift in parent gas

Abstract

The drift velocities of noble-gas and mercury ions in a constant homogeneous electric field are calculated using Monte Carlo simulations. The ion mobility is analyzed as a function of the field strength and gas temperature. The fitting parameters for calculating the drift velocity by the Frost formula at gas temperatures of 4.2, 77, 300, 1000, and 2000 K are obtained. A general approximate formula for the drift velocity as a function of the reduced field and gas temperature is derived.

Authors:
;  [1]
  1. Russian Academy of Science, Prokhorov General Physics Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22614054
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 43; Journal Issue: 1; Other Information: Copyright (c) 2017 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; APPROXIMATIONS; COMPUTERIZED SIMULATION; ELECTRIC FIELDS; ION DRIFT; ION MOBILITY; MERCURY IONS; MONTE CARLO METHOD; RARE GASES; TEMPERATURE DEPENDENCE

Citation Formats

Golyatina, R. I., and Maiorov, S. A., E-mail: mayorov-sa@mail.ru. Approximation of the characteristics of ion drift in parent gas. United States: N. p., 2017. Web. doi:10.1134/S1063780X17010032.
Golyatina, R. I., & Maiorov, S. A., E-mail: mayorov-sa@mail.ru. Approximation of the characteristics of ion drift in parent gas. United States. doi:10.1134/S1063780X17010032.
Golyatina, R. I., and Maiorov, S. A., E-mail: mayorov-sa@mail.ru. Sun . "Approximation of the characteristics of ion drift in parent gas". United States. doi:10.1134/S1063780X17010032.
@article{osti_22614054,
title = {Approximation of the characteristics of ion drift in parent gas},
author = {Golyatina, R. I. and Maiorov, S. A., E-mail: mayorov-sa@mail.ru},
abstractNote = {The drift velocities of noble-gas and mercury ions in a constant homogeneous electric field are calculated using Monte Carlo simulations. The ion mobility is analyzed as a function of the field strength and gas temperature. The fitting parameters for calculating the drift velocity by the Frost formula at gas temperatures of 4.2, 77, 300, 1000, and 2000 K are obtained. A general approximate formula for the drift velocity as a function of the reduced field and gas temperature is derived.},
doi = {10.1134/S1063780X17010032},
journal = {Plasma Physics Reports},
number = 1,
volume = 43,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2017},
month = {Sun Jan 15 00:00:00 EST 2017}
}
  • A drift tube-mass spectrometer was used to measured the mobility of CH{sub 5}{sup +}, C{sub 2}H{sub 5}{sup +} and C{sub 3}H{sub 5}{sup +} in CH{sub 4} over a wide range of the reduced field strength, E/N, from 15 to 500 Td (1 Td = 10{sup -17} V cm{sup 2}). The zero-field mobilities of these ions turn out to be lower than those predicted by Langevin`s polarization-limit theory. The low field mobilities for the first two ions are in good agreement with previous values obtained from other techniques. For E/N > 100 Td, the mobility of CH{sub 5}{sup +} is lowermore » than that of C{sub 2}H{sub 5}{sup +} {sm_bullet} suggesting a proton transfer process between CH{sub 5}{sup +} and CH{sub 4}. The mobility curves show a pronounced maximum over the range 200-300 Td.« less
  • The anisotropic fluid equations governing a frictionless obliquely flowing plasma around an essentially arbitrarily shaped three-dimensional ion-absorbing object in a strong magnetic field are solved analytically in the quasineutral drift approximation, neglecting parallel temperature gradients. The effects of transverse displacements traversing the magnetic presheath are also quantified. It is shown that the parallel collection flux density dependence upon the external Mach number is n{sub {infinity}}c{sub s} exp[-1-(M{sub parallel}{infinity}-M{sub perpendicular}cot {theta})], where {theta} is the angle (in the plane of field and drift velocity) of the object-surface to the magnetic-field and M{sub parallel{infinity}} is the external parallel flow. The perpendicular drift,more » M{sub perpendicular}, appearing here consists of the external E and B drift plus a weighted sum of the ion and electron diamagnetic drifts that depends upon the total angle of the surface to the magnetic field. It is that somewhat counterintuitive combination that an oblique (transverse) Mach probe experiment measures.« less
  • A mass spectrometer ion source designed specifically to measure high-pressure gas-phase ion-molecule equilibria as a function of temperature was developed. The ion source has coaxial electron entrance and ion exit apertures. Ions move through the source at a constant velocity determined by a uniform electric field gradient which is controlled by overlapping drift guard rings. The transport properties of Ar/sup +/ (mobility and diffusion) demonstrate that the effect of the electric field is negligible compared to thermal energies. Equilibria were investigated for the reactions forming the following gas-phase ion-molecule clusters: CO/sub 2//sup +/CO/sub 2/, SO/sub 2//sup +/CO/sub 2/, N/sub 2/O/supmore » +/N/sub 2/O, O/sub 2//sup +/CO/sub 2/, NO/sup +/CO/sub 2/, O/sub 2//sup +/N/sub 2/O, and NO/sup +/N/sub 2/O. The measure enthalpies and entropies of reaction were used to determine the cluster ion enthalpies and entropies of formation at 298 K. The bond energies (from the enthalpies at 0 K) were determined to be for CO/sub 2//sup +/CO/sub 2/, D/sup 0//sub 0/ = 15.9 kcal/mol; for SO/sub 2//sup +/CO/sub 2/, D/sup 0//sub 0/ = 10.2 kcal/mol; for N/sub 2/O/sup +/N/sub 2/O, D/sup 0//sub 0/ = 13.3 kcal/mol; for O/sub 2//sup +/CO/sub 2/, D/sup 0//sub 0/ = 9.8 kcal/mol; for NO/sup +/CO/sub 2/, D/sup 0//sub 0/ = 8.6 kcal/mol; for O/sub 2//sup +/N/sub 2/O, D/sup 0//sub 0/ = 10.8 kcal/mol; and for NO/sup +/N/sub 2/O, D/sup 0//sub 0/ = 7.7 kcal/mol. The experimental entropies of reaction for the formation of O/sub 2//sup +/N/sub 2/O and NO/sup +/N/sub 2/O are substantially less negative than those for O/sub 2//sup +/CO/sub 2/ and NO/sup +/CO/sub 2/. The entropy differences are large enough to suggest an inherent difference between the bonding or geometry for the ions bound to N/sub 2/O compared to those bound to CO/sub 2/.« less
  • The results of an investigation of the structure of an ion flow at the output of an accelerator with closed electron drift and an extended zone of accelerations as a functions of the characteristic of the magnetic field in the accelerator channel are discussed. (AIP)