Last edited by Mugore
Tuesday, October 20, 2020 | History

2 edition of Atomic collisional rate and ionization relaxation study in a helium shock wave. found in the catalog.

Atomic collisional rate and ionization relaxation study in a helium shock wave.

Satya Pal Kalra

Atomic collisional rate and ionization relaxation study in a helium shock wave.

by Satya Pal Kalra

  • 190 Want to read
  • 17 Currently reading

Published in [Toronto] .
Written in English

    Subjects:
  • Collisions (Nuclear physics),
  • Helium,
  • Ionization,
  • Shock waves

  • Edition Notes

    ContributionsToronto, Ont. University.
    The Physical Object
    Pagination1 v. (various pagings)
    ID Numbers
    Open LibraryOL18884782M

    Photoionization from excited states of helium plays an important role in the transfer of radiation through laboratory plasmasI and hot stellar atmospheres2. In addition, accurate cross sections for single-and multi-photon ionization from excited states of helium may be required for a quantitative understanding of the interaction of laser radiationCited by: Notes: The spectroscopic data below are for the isotope 4 He. He I Ground State 1s 2 1 S 0 Ionization energy cm-1 ( eV) Ref. M02 He II Ground State 1s 2 S 1 / 2 Ionization energy cm-1 ( eV) Ref. MK00b-1 ( eV) Ref. MK00b.

    Helium Atom, Many-Electron Atoms, Variational Principle, Approximate Methods, Spin 21st April I. The Helium Atom and Variational Principle: Approximation Methods for Complex Atomic Systems The hydrogen atom wavefunctions and energies, we have seen, are deter-mined as a combination of the various quantum "dynamical" analogues of. correlations) play a dominant role in atomic multiple ionizing reactions. Thus, already a study of double ionization can serve as a tool to investigatethe specific many-body properties of bound and continuum wavefunctions as well as of the collision process itself.

    rate coefficient calculations for the bare through Na-like ions of all elements from H to Zn. Using our data and the recommended electron impact ionization data of Mazzotta et al. (), we have calculated improved collisional ionization equilibrium calculations. File Size: KB. Abstract A two-parameter empirical formula is proposed to compute the electron collisional ionization cross sections for atoms and ions. An interpolation formula is given to compute one of the parameters when experimental information is missing, and the corresponding ionization rate is computed.


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Atomic collisional rate and ionization relaxation study in a helium shock wave by Satya Pal Kalra Download PDF EPUB FB2

Rate constants for the associative ionization reaction He * + He → He 2 + + e have been measured, where He* represents the n=3 states of helium. By line absorption from the metastable 21S and 23S states, the n=3 states in the positive column of a dc discharge in helium were selectively and periodically modulated.

Using phase‐sensitive detection, the changes in excited‐state populations Cited by: when an atomic or molecular solute is added, it rapidly migrates to the walls of the container, since this delivers a lower net energy. This rapid phase separation has severely limited the study of molecules in bulk liquid helium.

Work that has been done has been largely limited to small metal. For high-energy projectiles, excitation of an electron from one bound state to another and ionization of a hound electron into the continuum are the dominant processes.

For ionization, the final state is defined by the closed-form expression for the Coulomb continuum wavefunction in parabolic coordinates or by a corresponding partial-wave expansion. Shock structure during ionization of a hydrogen‐helium mixture has been followed using hydrogen line and continuum emission measurements.

A reaction scheme is proposed which includes hydrogen dissociation and a two‐step excitation‐ionization mechanism for hydrogen ionization by atom‐atom and atom‐electron collisions. Agreement has been achieved between numerical Cited by: Title: Collisional ionization of helium by eV electrons: experiments with completely determined kinetics: Authors: Ehrhardt, H.; Hesselbacher, K.

H.; Jung, K. Gasdynamics of Explosions and Reactive Systems determined for CO–N 2 O reaction products in a shock tube nozzle flow for different gas conditions behind reflected shock wave.

The comparative study of gain and vibrational temperatures T 3 and T 2 Gas Dynamics of Explosions and Reactive Systems documents the proceedings of the 6th.

Ionization and dissociation equilibrium in strongly-magnetized helium atmosphere 3 Table 2. Total binding energy [eV] of He2 in comparison with ML B12 This work ML06 1 10 Figure 2. Binding energy curve of He2 in (0,1,2,m) states at B = G.

The asterisk points are the binding energies from our numerical. Studies of' the threshold electron impact ionization of' helium I / / / / / Figure 1.

A section through the target chamber and detection systems. The shaded area represents the collision region, A is the shielding. mesh, B are outer focusing electrodes, C are cylindrical plate deflector analysers, D are channel multiplier detectors, and E are.

Chapter 3 Collision processes Electron impact ionization Collisions of atoms and ions with electrons, protons and other particles can also have effect upon the gas ionization degree in nebulae. The collisional ionization rate increases rapidly at higher values of gas temperature.

In planetary nebulae the most effective are the electronFile Size: KB. for the helium atom Hamiltonian taken in the nonrelativis-tic approximation, H p2 1 1 p 2 2 2 1 P2 2M 2 Z r 1 2 Z r 2 1 1 r.

(5) Here r 1,2 jr 1,2j and r jr 1 2 r 2j; p 1,2 are momenta of the electrons and P 2p 1 2 p 2 is the momentum of the nucleus.

Unless otherwise specified, we use the atomic units e h¯ m e 1 and c 1 a throughout this. Elementary processes in astrophysical environments traditionally attract researchers’ attention.

We present the data needed for the inclusion of the specific atomic collisional processes in the investigation of the optical and kinetic properties of weakly ionized stellar atmosphere layers.

The first type of processes are collisional ionisation (chemi-ionization) processes, and the second Cited by: 1. Photons of sufficient energy can, on absorption, kick an electron off an atom or ion, in a process called inverse process in which an ion and an electron combine with emission of a photon is called the atom or ion is in its ground state, the minimum photon energy that can remove an electron is called the ionization potential, usually denoted by I or χ.

Four years after a first meeting in BADDECK, Canada, on the Physics of Ion-Ion and Electron-Ion collisions, a second Nato Advanced Study Institute, in HAl~/Lesse, Belgium, reexamined the subject which had become almost a new one, in consideration of.

Coefficients for volume recombination and ionization have been calculated for a dense helium plasma of low degree of ionization. The calculations are based on a collisional-radiative model in which electron-atom, electron-electron-ion, atom-atom, and electron-atom-ion collisions by: This experiment fits in the experimental studies of single ionization of helium with charged particles.

It is a linkage between ionization by slow proton impact ([8], [9]) and single ionization by fast highly charged ions ([2], [3]). Single ionization of helium proves to be caused by a highly complex interplay of interactions of a three-body. Collisional ionization equilibrium (CIE) (sometimes called coronal equilibrium from its application to the hot coronae of stars) is a dynamic balance at a given temperature between collisional ionization from the ground states of the various atoms and ions present in the plasma and the process of recombination from the higher ionization stages.

In this equilibrium, effectively, all ions are in their Author: Michael A. Dopita, Ralph S. Sutherland. It is close to the nucleus and unscreened. The value of the first ionization energy ( eV) of helium is much higher than hydrogen ( eV).

It is well known that the energy of eV is given by applying the Bohr formula, while for the first ionization energy of eV of helium so far no one was able to formulate any successful formula. Introduction. Total cross sections for the ionization and excitation of atoms and molecules by electron impact is one of the essential sets of data needed in a wide range of applications, such as modeling plasmas for plasma processing of semiconductors, designing mercury-free fluorescent lamps, assessing the efficiency of ion gauges, normalizing mass spectrometer output, diagnosing plasmas in.

Collisional Excitation and N-Level Atoms. 1 Collisional Excitation & Deexcitation Consider an atom or ion with a lower energy level 1 and an upper level 2. Collision of a free electron with kinetic energy greater than E12 may excite the ion from 1 to 2, while collisions with electrons of any energy may deexcite the ion from 2 to Size: 91KB.

Atomic collisions offer some unique opportunities to study atomic structure and reaction mechanisms in experiment and theory, especially for projectiles of high atomic number provided by modern accelerators. The book is meant as an introduction into the field and provides some basic theoretical understanding of the atomic processes occurring when a projectile hits another atom.

It is perhaps surprising that a process which was one of the first to be studied on an atomic scale, and a process which first received attention over seven decades ago, continues to be the object of diverse and intense research efforts. Such is the case with the (seemingly) conceptually simple and familiar mechanism of electron impact ionization of atoms, molecules, and ions.Helium Atom, Approximate Methods 22nd April I.

The Helium Atom and Variational Principle: Approximation Methods for Complex Atomic Systems The hydrogen atom wavefunctions and energies, we have seen, are deter-mined as a combination of the various quantum "dynamical" analogues of.of ~a!

atomic orbital radii, which can be obtained from atomic wave function codes, ~b! atomic orbital occupation numbers, which are derived from the Mulliken population analysis of the target molecule, and ~c!

atomic weighting factors, which have been fitted to known atomic ionization cross sections. Our theory uses far fewer, ab initio molecular.