A Monte Carlo Description of the Sampling of Stratospheric Ion Clusters via a Mass Spectrometer.

Abstract

A detailed Monte Carlo simulation of the flow within an ion sampling mass spectrometer is described. The simulation includes effects of non equilibrium flow and acceleration due to electric fields. A scheme for proton hydrate reactions is presented, including estimations of rate constants for agglomeration of H20 onto positive ion clusters and lifetimes of the resulting complex. Complexes can be collisionally excited or stabilized within the model. Test calculations are performed for altitudes of 30 and 38 km. No significant effect of agglomeration of H20 onto ion clusters was predicted in either case, but collisional excitation and subsequent dissociation of clusters was found to be a potentially severe problem. Keywords: Ion clustering; Stratosphere; Mass spectrometer; Water vapor.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1985
Accession Number
ADA168523

Entities

People

  • James B. Elgin
  • James W. Duff

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Boundary Layer
  • Chemical Reactions
  • Computational Fluid Dynamics
  • Computational Science
  • Dissociation
  • Electric Fields
  • Flow
  • Fluid Flow
  • Fluid Mechanics
  • Mass Spectrometers
  • Measurement
  • Monte Carlo Method
  • Sampling
  • Simulations
  • Spectrometers
  • Two Dimensional

Readers

  • Computational Fluid Dynamics (CFD)
  • Molecular Photonics/Laser Physics

Technology Areas

  • Space
  • Space - Hall-Effect Thruster