Author: James Patrick Moran
Publisher:
ISBN:
Category : Argon
Languages : en
Pages : 216
Book Description
Time-of-flight (TOF) measurements were made in both heated and unheated initially mono-energetic argon beams before and after reflection from heated platinum targets. A new and quite simple beam source is described which generates the high intensity, nearly mono-energetic incident beam. Targets were prepared by chemical cleaning. Beams directed at these targets were reflected in directed nonspecular lobes and the molecular TOF distributions in these lobes were investigated. Low order moments of the velocity distribution are obtained directly from the TOF data by integrating the TOF curves after they are weighted by appropriate, derived functions. Relative number flux, momentum flux and energy flux are obtained and ratios of these fluxes yield mean speed and mean energy as a function of angle of reflection. These flux moments are also used to calculate a speed ratio which provides a measure of spread in speed distribution divided by the mean speed. These integrated results are presented for incident beam angles of 20, 40, 55, 65, and 80 degrees, to the target normal and a target temperature of 1000C. In all cases reflected mean momentum and energy show a marked angular dependence, decreasing with increasing angle of reflection from the target normal at a given angle of incidence. The mean tangential velocity is close to the incident beam value over a range of reflection angles which contain most of the reflected particles. The speed ratio at all angles of reflection is appreciably larger than the incident beam value. The differential energy accommodation coefficient increases with increasingly glancing angles and decreases with increasing angle of reflection. (Author).
Experiments on Scattering of Mono-energetic Argon Beams by Heated Platinum
Author: James Patrick Moran
Publisher:
ISBN:
Category : Argon
Languages : en
Pages : 216
Book Description
Time-of-flight (TOF) measurements were made in both heated and unheated initially mono-energetic argon beams before and after reflection from heated platinum targets. A new and quite simple beam source is described which generates the high intensity, nearly mono-energetic incident beam. Targets were prepared by chemical cleaning. Beams directed at these targets were reflected in directed nonspecular lobes and the molecular TOF distributions in these lobes were investigated. Low order moments of the velocity distribution are obtained directly from the TOF data by integrating the TOF curves after they are weighted by appropriate, derived functions. Relative number flux, momentum flux and energy flux are obtained and ratios of these fluxes yield mean speed and mean energy as a function of angle of reflection. These flux moments are also used to calculate a speed ratio which provides a measure of spread in speed distribution divided by the mean speed. These integrated results are presented for incident beam angles of 20, 40, 55, 65, and 80 degrees, to the target normal and a target temperature of 1000C. In all cases reflected mean momentum and energy show a marked angular dependence, decreasing with increasing angle of reflection from the target normal at a given angle of incidence. The mean tangential velocity is close to the incident beam value over a range of reflection angles which contain most of the reflected particles. The speed ratio at all angles of reflection is appreciably larger than the incident beam value. The differential energy accommodation coefficient increases with increasingly glancing angles and decreases with increasing angle of reflection. (Author).
Publisher:
ISBN:
Category : Argon
Languages : en
Pages : 216
Book Description
Time-of-flight (TOF) measurements were made in both heated and unheated initially mono-energetic argon beams before and after reflection from heated platinum targets. A new and quite simple beam source is described which generates the high intensity, nearly mono-energetic incident beam. Targets were prepared by chemical cleaning. Beams directed at these targets were reflected in directed nonspecular lobes and the molecular TOF distributions in these lobes were investigated. Low order moments of the velocity distribution are obtained directly from the TOF data by integrating the TOF curves after they are weighted by appropriate, derived functions. Relative number flux, momentum flux and energy flux are obtained and ratios of these fluxes yield mean speed and mean energy as a function of angle of reflection. These flux moments are also used to calculate a speed ratio which provides a measure of spread in speed distribution divided by the mean speed. These integrated results are presented for incident beam angles of 20, 40, 55, 65, and 80 degrees, to the target normal and a target temperature of 1000C. In all cases reflected mean momentum and energy show a marked angular dependence, decreasing with increasing angle of reflection from the target normal at a given angle of incidence. The mean tangential velocity is close to the incident beam value over a range of reflection angles which contain most of the reflected particles. The speed ratio at all angles of reflection is appreciably larger than the incident beam value. The differential energy accommodation coefficient increases with increasingly glancing angles and decreases with increasing angle of reflection. (Author).
Out-of-plane Scattering of an Argon Molecular Beam by Heated Platinum
Author: Arthur Robert Rudnicki (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 160
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 160
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 652
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 652
Book Description
An Analytical Study of Hypersonic Inlets in Free-molecule Flow
Author: Max Kinslow
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 32
Book Description
A report is made of an analytical study of free-molecule, hypervelocity air inlet configurations which might be used to supply gas for ion engines aboard satellites. The basic equations for the inlet are developed based upon gas-surface interactions. These equations are numerically solved for various gas-surface interaction parameters. Based upon these inlets, ion rocket performance is determined for various efficiencies. (Author).
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 32
Book Description
A report is made of an analytical study of free-molecule, hypervelocity air inlet configurations which might be used to supply gas for ion engines aboard satellites. The basic equations for the inlet are developed based upon gas-surface interactions. These equations are numerically solved for various gas-surface interaction parameters. Based upon these inlets, ion rocket performance is determined for various efficiencies. (Author).
OAR Cumulative Index of Research Results
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1264
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1264
Book Description
Dynamics of Gas-Surface Scattering
Author: Frank O. Goodman
Publisher: Elsevier
ISBN: 0323154611
Category : Science
Languages : en
Pages : 352
Book Description
Dynamics of Gas-Surface Scattering deals with the dynamics of scattering as inferred from known properties of gases and solids. This book discusses measurements of spatial distributions of scattered atomic and molecular streams, and of the energy and momentum which gas particles exchange at solid surfaces. It also considers two regimes of scattering, both of which are associated with a lower range of incident gas energies: the thermal and structure scattering regimes. Comprised of 10 chapters, this book opens with a brief historical overview of the early experiments that investigated the dynamics of scattering of gases by surfaces. The discussion then turns to some elements of the kinetic theory of gases; intermodular potentials and interaction regimes; and classical-mechanical lattice models used in gas-surface scattering theory. The applications of molecular beams to the study of gas-surface scattering phenomena are also described. The remaining chapters focus on experiments and theories on scattering of molecular streams by surfaces of solids, with emphasis on thermal and structure regimes of inelastic scattering; quantum theory of gas-surface scattering; and quantum mechanical scattering phenomena. This text concludes with an analysis of energy exchange processes that may occur when a solid surface is completely immersed in a still gas. This monograph will be a valuable resource for students and practitioners of physics, chemistry, and applied mathematics.
Publisher: Elsevier
ISBN: 0323154611
Category : Science
Languages : en
Pages : 352
Book Description
Dynamics of Gas-Surface Scattering deals with the dynamics of scattering as inferred from known properties of gases and solids. This book discusses measurements of spatial distributions of scattered atomic and molecular streams, and of the energy and momentum which gas particles exchange at solid surfaces. It also considers two regimes of scattering, both of which are associated with a lower range of incident gas energies: the thermal and structure scattering regimes. Comprised of 10 chapters, this book opens with a brief historical overview of the early experiments that investigated the dynamics of scattering of gases by surfaces. The discussion then turns to some elements of the kinetic theory of gases; intermodular potentials and interaction regimes; and classical-mechanical lattice models used in gas-surface scattering theory. The applications of molecular beams to the study of gas-surface scattering phenomena are also described. The remaining chapters focus on experiments and theories on scattering of molecular streams by surfaces of solids, with emphasis on thermal and structure regimes of inelastic scattering; quantum theory of gas-surface scattering; and quantum mechanical scattering phenomena. This text concludes with an analysis of energy exchange processes that may occur when a solid surface is completely immersed in a still gas. This monograph will be a valuable resource for students and practitioners of physics, chemistry, and applied mathematics.
Mass Spectrometry Bulletin
Author:
Publisher:
ISBN:
Category : Mass spectrometry
Languages : en
Pages : 926
Book Description
Publisher:
ISBN:
Category : Mass spectrometry
Languages : en
Pages : 926
Book Description
Entropie
Author:
Publisher:
ISBN:
Category : Heat engineering
Languages : en
Pages : 214
Book Description
Publisher:
ISBN:
Category : Heat engineering
Languages : en
Pages : 214
Book Description
Nuclear Science Abstracts
Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1202
Book Description
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1202
Book Description
Naval Research Reviews
Author:
Publisher:
ISBN:
Category : Naval research
Languages : en
Pages : 476
Book Description
Publisher:
ISBN:
Category : Naval research
Languages : en
Pages : 476
Book Description