Walsh's Diagram
References:
1- http://mcgrady.chem.ox.ac.uk/lectures/bonding_in_molecule/lecture_3.pdf
2-http://www.pci.tu-bs.de/aggericke/PC4e/Kap_V/Walsh.htm
3-http://www.colby.edu/chemistry/PChem/notes/Walsh.pdf
4-http://www.chembio.uoguelph.ca/educmat/chm364_preuss/5_4%20Walsh%20Diagrams.pdf
5-http://www.dsf.unica.it/~sandro/Materiale_Corso/Molec/Demtroeder_polyatomic.pdf
6-http://users.physik.fu-berlin.de/~pascual/Vorlesung/SS06/Slides/AMOLI%20-%20L8a.pdf
7-