Physics
Scientific paper
Apr 1930
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1930natur.125..528m&link_type=abstract
Nature, Volume 125, Issue 3153, pp. 528-529 (1930).
Physics
Scientific paper
IT has been shown by me (Zeits. f. Phys., 55, 338; 1929) that the dissociation energy of Hg2 molecules is greater than has been supposed. Also, for Cd2 molecules several optical data show that we have to deal with high dissociation energy (23 kcal./mol. given by Jablonski). The dissociation energy of Zn2 molecules found by Winans cannot be considered as probable, because Jablonski and Kapuscinski have shown that the considerations of Winans led to erroneus value for the dissociation energy of Cd2 molecules. Therefore it seems interesting to make direct measurement of the evaporation energy of Zn2 molecules. This last value was found from changes of the band absorption coefficient to be dependent upon the temperature of saturated zinc vapour. Preliminary microphotometric measurements of photographic plate density were made for three wavelengths, 2313, 2502, and 2558 A. for the range of temperatures 790°-920° C. The results of calculations give a number of values which do not differ more than 3 kcal./mol. from the average value 32 kcal.-mol. It is thus possible to give in a table a comparison of energies of evaporation of atoms (1), of corresponding molecules (2) and their dissociation energies (3), for three elements-zinc, cadmium, and mercury (in kcal./mol.):
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