684 



BELL SYSTEM TECHNICAL JOURNAL 



TABLE II 



Heats of Sublimation for Several Metals Including the Transition Elements 

 IN Kilocalories per Gram Atom * 



* Taken from F. R. Bichowsky and F. D. Rossini "The Thermochemistry of the 

 Chemical Substances," Reinhold (1936), except for T which was taken from D. B. 

 Langmuir and L. Maker, Phys. Rev. 55, 1138 (1939). 



Energy Bands of Diamond 

 In Fig. 17 we show the band structure for diamond as calculated by 

 Kimball. ^^ The configuration of the carbon atom is Is^ls^lp^ and 



ao 



5 6 7 8 9 10 II 12 



LATTICE CONSTANT IN ANGSTROMS 



Fig. 17 — Energy bands for diamond versus lattice constant. 



all four of the L shell electrons are involved in the binding. At large 

 lattice constants the lower band contains two states per atom and the 

 upper six. The lower band is completely filled, the upper only one- 



1® G. E. Kimball, Jour. Chem. Phys., 3, 560 (1935). Some unimportant features 

 resulting from approximations in Kimball's work have been modified in this figure. 



