MAKE A MEME View Large Image Fine hyperfine levels.png Fine and hyperfine structure in hydrogen The coupling of the different angular momenta leads to energy level splitting Not drawn to scale The electron spin angular momentum S is coupled to the electron orbital ...
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Keywords: Fine hyperfine levels.png Fine and hyperfine structure in hydrogen The coupling of the different angular momenta leads to energy level splitting Not drawn to scale The electron spin angular momentum S is coupled to the electron orbital angular momentum L to form the total electronic angular momentum J This is subsequently coupled to the nuclear spin angular momentum I to form the total angular momentum F The term symbol takes the form <sup>2S+1</sup>L with the values of L represented by letters S P D F G H 0 1 2 3 4 5 so that for instance a <sup>2</sup>P term represents a state with S 1/2 and L 1 The single electron in a 1s subshell gives rise to the <sup>2</sup>S term L 0 and S 1/2 can only combine to give J 1/2 This in turn can combine with the nuclear spin I 1/2 to give total angular momentum F 0 1 The single electron in a 2p subshell gives rise to the <sup>2</sup>P term L 1 and S 1/2 can combine to give J 1/2 and J 3/2 These can combine with the nuclear spin I 1/2 to give total angular momenta F 0 1 and F 1 2 respectively The hyperfine splitting of the ground <sup>2</sup>S state is the source of the 21 cm hydrogen line important in astronomy own DJIndica 2008-09-09 File Hydrogen-Fine-Hyperfine-Levels svg chemistry Check categories 2008 November 14 en wikipedia Hyperfine_structure en wikipedia Hydrogen_line Hydrogen Radio astronomy History of physics Cosmology Spectroscopy Hydrogen physics
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