The vaporization of pure bismuth and of a 1 : 1 Bi+Pb alloy were studied. Above pure bismuth the species Bi, Biz, Big and Bi, were observed in the approximate ratios 0-6 : 1.0 : 0.002 : 0-02. The atomization energies per bonding atom were calculated from partial pressure measurements to be 47.0, 43.0 and 47.0 kcal/mole for Biz, Bi3 and Bi4 respectively. The molecule BiPb was identified and its dissociation energy determined to be Dg(BiPb) = 33.0 kcal/mole. *The ratio 14/12 was used to insure against any fluctuation in instrument sensitivity with time although either intensity could be used separately.
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