CHEM 1301 Chapter Notes - Chapter 4.3: Energy Level, Photon, Absorption Spectroscopy
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22 Nov 2017
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Chapter 4 atoms and light 4. 3 absorption and emission spectra. Explaining the origins of atomic spectra and relating electron energies in the hydrogen atom to its emission spectrum. The observation of discrete spectral lines suggests that an electron in an atom can have only certain energy levels. Photoionization (or ionization): process when an atom absorbs a photon of sufficiently high energy to eject an electron and become an ion. When an atom absorbs a photon of energy which is not powerful enough to ionize it, the atom is transformed to a higher energy state, which is called an excited state. Any excited state of any atom is unstable. Atoms in excited state give up their excess energy to return to the ground state the lowest energy state for the electrons in an atom. In the exchange of energy between atom and light the energy is conserved : delta e atom = +/- h v photon.
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