E3N4_Oct20[1] - Atoms interact with photons We are now in a...

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Atoms interact with photons
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We are now in a position to understand this physically
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Summing Up Geometry determines whether we see absorption or emission lines Ionization happens when and electron escapes: gains so much energy it escapes the attractive force of the nucleus. This happens in two ways: – 1) Absorption of photons with energies greater than the highest bound state (a bit like the photo-electric effect) – 2) Collisions with other electrons or atoms “bump” the electron up (see demo in Redshift) Recombination is the reverse , of ionization, one or more photons is emitted.
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Summing Up (Cont’d) Continuum Spectra are produced by fully ionized, hot, dense (why?) material emitting photons, this is thermal radiation, or black body radiation. – collisions of free electrons and photon processes operate during ionization and recombination. Together these make the continuum spectra. – Thermal motions, or energy (set by T), of
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This note was uploaded on 11/27/2011 for the course AST 301 taught by Professor Harvey during the Spring '07 term at University of Texas.

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E3N4_Oct20[1] - Atoms interact with photons We are now in a...

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