The interaction of deuterium and a variety of alkanes and cycloalkanes on evaporated nickel films and on a reduced nickel oxide catalyst leads to very similar results. Isotopic exchange occurs conveniently at 150-200°to produce species with from one to all hydrogen atoms exchanged. With heptane and 3-methylhexane, the most abundant species are those of extensive but not total exchange. With cyclopentanes, cyclohexanes and 2,3-dimethylbutane, the most abundant is the fully ex-
The absorption spectra of the molecules SiO, GeO and SnO have been examined in the region 1250 to 2000Å. A number of new band systems have been found, and vibrational analyses have been carried out. The determination of the dissociation enérgies of these molecules is discussed: the values derived spectroscopically for SiO, GeO and SnO are 185∙
0
±6∙
8
, 155∙
8
±5∙
3
and 126∙
0
±4∙
9
kcal (0° K) respectively. The values for GeO and SnO are in satisfactory agreement with the results of thermochemical work, but the result for SiO suggests that the value of the latent heat of sublimation of silicon is higher than has been suggested, and indicates
L
si
⋍100 kcal. The correlation between the states of carbon monoxide and of silicon monoxide is briefly considered, and a provisional value for the ionization potential of SiO, 10∙5
1
eV, is derived.
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