CHM 2354 Lecture Notes - Lecture 18: Atomic Spectroscopy, Emission Spectrum, Absorption Spectroscopy
25 May 2015
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Document Summary
In the atmosphere the gases (mainly nitrogen, n2, oxygen o2, co2, water vapour) On the top level the gases atomize giving nitrogen and oxygen atoms (not molecules) When the cosmic rays enter the atmosphere they excite atomic oxygen in such a way that the atoms emit photons in their emission spectrum (falls in green and red) Continuous have photons across the range of visible spectrum, all energy levels we see these are colours because colours are photons with a certain energy. Absorption spectrum absorb photons and so remove them from atmosphere this is why you see black lines (no photons with this level of energy) Emission spectrum opposite of absorption, photons with a certain energy, not a continuous range of energy, just certain energy levels with photons seen as lines. The sun has all protons present, white light (continuous spectrum) When this light goes through gas the atoms absorb the energy which eliminates certain photons.
