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3 edition of High temperature electronic excitation and ionization rates in gases found in the catalog.

High temperature electronic excitation and ionization rates in gases

High temperature electronic excitation and ionization rates in gases

final report on NASA grant-1-1211 : semi-classical theory of electronic exictation rates

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Ionization of gases.

  • Edition Notes

    Other titlesSemi-classical theory of electronic excitation rates.
    Statementby C. Frederick Hansen.
    SeriesNASA contractor report -- NASA CR-189496.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17679113M

    The excitation temperature is defined for a population of particles via the Boltzmann satisfies = ⁡ (−), where n u and n l represent the number of particles in an upper (e.g. excited) and lower (e.g. ground) state, and g u and g l their statistical weights respectively.. Thus the excitation temperature is the temperature at which we would expect to find a system with this ratio. Ionization or ionisation is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons, often in conjunction with other chemical resulting electrically charged atom or molecule is called an tion can result from the loss of an electron after collisions with subatomic particles, collisions with other atoms, molecules and.

    Electronic excitation of ground state atoms by collision with heavy gas particles. Final report, June June Final report, June June Full Record. Abstract. In the present paper, a strongly non-equilibrium one-dimensional steady-state flow behind the plane shock wave is studied. We consider a high-temperature chemically reacting five-component ionized mixture of nitrogen species (N{sub 2}/N{sub 2}{sup 2}/N/N{sup +}/e{sup −}) taking into account electronic degrees of freedom in N and N{sup +} ( and electronic energy levels.

    Deposition Rate vs. Chamber Pressure High chamber pressure results in low deposition rate Mean-free path of an atom in a gas ambient: In fact, sputtering deposition rate R: () () 5 10 ~ 3 cm P torr × − λ L P R ⋅ ∝ 1 Use previous example: L = 10 cm, P = 50 mtorr ¨λ~ cm ¨sputtered atoms have to go through hundreds of collisions. Understanding the correlation between proteins’ tertiary and electronic structures is a great challenge, which could possibly lead to a more efficient prediction of protein functions in living organisms. Here, we report an experimental study of the interplay between electronic and tertiary protein structure, by probing resonant core excitation and ionization over a number of charge-state.


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High temperature electronic excitation and ionization rates in gases Download PDF EPUB FB2

The relaxation times for electronic excitation due to electron bombardment of atoms was found to be quite short, so that electron kinetic temperature (T sub e) and the electron excitation temperature (T asterisk) should equilibrate quickly whenever electrons are present.

However, once equilibrium has been achieved, further energy to the excited electronic states and to the kinetic Author: Frederick Hansen. James M. Farrar, in Encyclopedia of Physical Science and Technology (Third Edition), III.B.5 Electronic State Selection.

Electronic excitation of atomic ions provides numerous opportunities to observe dramatic effects in both the overall rates of reaction of such species and the distributions of products in these reactions.

Three fundamental methods have been applied to the production of. Gas ionization detectors can be characterized by the effects created by different field strengths between the charge-collecting electrodes.

The relationship between the pulse size produced and the potential applied across the electrodes of a gas ionization detector is shown in Fig.

The pulse size depends on the field strength and also on the type of radiation that enters the detector. Purchase Ionization in High-Temperature Gases - 1st Edition.

Print Book & E-Book. ISBNBook Edition: 1. Different cut-off criteria of partition functions have been utilized in order to evaluate the con­tribution of electronic excitation to thermodynamic properties of high temperature gases ( The objective of the present study is to generalize our previous one-temperature models of high-temperature reacting flows with electronic excitation [4,6, 7] including state-to-state kinetics of.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Electronic excitation and ionization temperature measurements in a high frequency inductively coupled argon plasma source and the influence of water vapour on plasma parameters Author links open overlay panel J.F.

Alder R.M. Bombelka 1 G.F. Kirkbright. Speetroehimiea Aeta, Vol. 35B, pp. to Pergamon Press Ltd., Printed in Great Britain Electronic excitation and ionization temperature measurements in a high frequency inductively coupled argon plasma source and the influence of water vapour on plasma parameters J.

ALDER, R. BOMBELKA* and G. KIRKBRIGHT Chemistry Department, Imperial College. A further simplification for the ionization rate, as well as the excitation rate, was expressed as a function of the electron temperature in an Arrhenius form as shown: (12) R i = k i 0 n e n N exp (-E i k B T e), (13) R ex = k ex 0 n e n N exp (-E ex k B T e), where k i0 and k ex0 are the pre-exponential coefficients, and E i and E ex are the.

The speed of sound is equal to = √ / where γ = is the ratio of specific heats [40], R the perfect gas constant, the gas temperature, and M the molar mass. In a gas composed of electrons. Moreover, the V–V up pumping rates largely depend on T gas, as shown for cold molecular plasma involving diatomic molecules [5–7], leading to a non-Arrhenius behaviour of the PVM rates as a function of 1/T gas, i.e.

the rates are seen to increase with decreasing the gas temperature [5–7]. This aspect will be discussed in the present work. Electronic books Conference papers and proceedings Congresses: Additional Physical Format: Print version: Shuler, Kurt E.

Ionization in high-Temperature Gases. Burlington: Elsevier Science, © Material Type: Document, Internet resource: Document Type: Internet Resource, Computer File: All Authors / Contributors: Kurt E Shuler.

Get this from a library. High temperature electronic excitation and ionization rates in gases: final report on NASA grant semi-classical theory of electronic exictation rates.

[C Frederick Hansen; United States. National Aeronautics and Space Administration.]. High temperature electronic excitation and ionization rates in gases [microform]: final report on NASA Ionizing radiation and health / Arthur C. Upton; An introduction to magneto-fluid mechanics, by V.C.A.

Ferraro and C. Plumpton; Plasma heating from nonlinear effect of large amplitude alfven waves / [by] C. Watson-Munro, R. The obtained ionization rates vary with pressure for different applied voltages, as shown in figure It can be seen that the ionization rate decreases with an increase in pressure because of the decreased electron excitation energies, and there is a higher ionization rate.

In the present study rate coefficients for vibrational excitation of CO2 gas molecules by electrons in the presence of uniform electric and magnetic fields are investigated.

lonization and De-Ionization in High-Temperature 19 Gases VII. Excitation of Electronic States Behind Shock 25 Waves: Experimental Evidence VIII.

Excitation of Electronic States: A Preliminary 35 Model IX. Discussion 39 Acknowledgments 41 Appendix A - Energy Balance in a Normal Shock 42 Appendix B - Vibrational Relaxation Times   Measurements of positron temperature as a function of time are presented when a positron gas, confined in an electromagnetic trap at an elevated temperature (K), is cooled by int.

excitation, dissociation, ionization), rate of gas temperature rise • Need for non-intrusive, spatially resolved, time- resolved electric field measurements in transient reacting plasmas, near surfaces • Insight into kinetics of ionization and charge transport, validation of kinetic models.

Nevertheless, using this temperature in Maxwellian electron velocity distribution function would be misleading if e.g.

electron collision excitation or ionization rates were calculated based on.Initial Ionization Rates in Shock-Heated Argon, Krypton, and Xenon rather than the ionization potentials of the gases, indicating that in this range ionization proceeds via a two-step process involving the first excited electronic states of which the excitation step is rate controlling.Quantity Value Units Method Reference Comment; IE (evaluated) ± eV: N/A: N/A: L: Quantity Value Units Method Reference Comment; Proton affinity (review).