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Review of Atomic Collision Processes

Published online by Cambridge University Press:  14 August 2015

M.J. Seaton
M.J. Seaton*
Affiliation:
Dept. of Physics, University College London, England

Extract

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The following processes have to be considered.

  1. (a) Radiative capture,

    The number of captures on the level i of the atom X, per unit volume per unit time, is NeN(X+)αi(Te), where the recombination coefficient αi (cm3 sec−1) may be expressed in terms of the cross-section for photo-ionization from level i.

  2. (b) Cascade,

    The coefficients α(c)i and αi′i are defined to be such that NeN(X+) α(c)i is the number of atoms entering i due to capture and cascade, and that NeN(X+) αi′i is the number of photons emitted in the i′→ i line.

  3. (c) Collisional transitions between excited states, including: collisional redistribution of angular momentum; collisional redistribution of energy between highly excited states; and collision processes which depopulate metastable states.

  4. (d) Effects of radiative transfer. The following limiting cases have been considered:

    • Case A: Nebulae optically thin in all spectrum lines.

    • Case B: Nebulae optically thick for transitions to the ground state.

    • Case C: As Case B, but with absorption of stellar quanta in transitions from the ground state, assuming the central star to radiate as a black body.

Type
Session III – Physical Processes
Information
Symposium - International Astronomical Union , Volume 34: Planetary Nebulae , 1968 , pp. 127 - 137
Copyright
Copyright © Reidel 1968 

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