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- W4241567489 abstract "The following processes have to be considered. (a) Radiative capture, The number of captures on the level i of the atom X , per unit volume per unit time, is N e N ( X + )α i ( T e ), where the recombination coefficient α i (cm 3 sec −1 ) may be expressed in terms of the cross-section for photo-ionization from level i . (b) Cascade, The coefficients α (c) i and α i′i are defined to be such that N e N ( X + ) α (c) i is the number of atoms entering i due to capture and cascade, and that N e N ( X + ) α i′i is the number of photons emitted in the i ′→ i line. (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. (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." @default.
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- W4241567489 date "1968-01-01" @default.
- W4241567489 modified "2023-09-28" @default.
- W4241567489 title "Review of Atomic Collision Processes" @default.
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- W4241567489 doi "https://doi.org/10.1017/s0074180900020507" @default.
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