Transcription of Term Symbols and Molecular Spectroscopy
1 Term Symbols and Molecular Spectroscopy Atomic Term Symbols - Oxygen L 0 1 2 3 Term S P D F ground state: (1s)2 (2s)2 (2p)4 L = ML,max = +1+1+ 0 -1 = 1 3P +1 0 -1 excited states: (1s)2 (2s)2 (2p)4 L = ML,max = +1+1+ 0 +0 = 2 1D +1 0 -1 and 1S Homonuclear Diatomics* O2 ground state: KK ( g,2s)2( *u ,2s)2( g,2pz)2( u,2p)4( *g ,2p)2 = +1+1-1-1+1-1 = 0 = +1+1-1-1+1+1 = 2 = +1+1-1-1+1-1 = 0 3 -g 1 g 1 +g ..( g,2pz)2( u,2p)3( *g ,2p)3 ..( g,2pz)1( u,2p)4( *g ,2p)3 = +1+1-1+1-1-1 = 0 = +1+1-1+1+1-1 = 2 ? ? 3 +u + 3 -u + 3 u 0 10000 20000 30000 40000 50000 60000 70000 1 2 3 4 R ( ) 3 1 1 3 3 3 3 1 O( P) + O( D)O( P) + O( P)u g g g 3 u + + ----2 4 6 8 eV E (cm ) -1 * Configuration diagrams are schematic.
2 No single diagram can represent an open shell system. These diagrams do not take into account electron indistinguishability and orbital degeneracy. u g u g
