The origin and evolution of the Earth's early atmosphere depend crucially on the dissipation time, tN, of the primitive solar nebula, SN. Using different theories of turbulence, it is estimated that for a 0.1 .**GRAPHIC**. SN, tN is 2.5-8.3 million yr. Because accretion times are usually much longer, most planetary accretion must have occurred in a gas-free environment. Using new IUE [International UV Explorer] data, a wavelength-dependent UV flux is constructed for the young Sun which is then used to study the photochemistry and concentrations of O, O2, O3, OH, H, HCO and formaldehyde H2CO in the Earth's early prebiological atmosphere, which have implications for the origin of life.
CITATION STYLE
Johnsson, W. A., & Mehl, R. F. (1940). Reaction kinetics in processes of nucleation and growth. Trans. Am. Inst. Min. Metall. Eng., 135, 416–442.
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