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Evolution of the atmosphere
144
tant for several stable atmospheric species. Experiments are in progress to investigate free-radical reactants and to check for reactions that may be catalyzed by atmsopheric surfaces. The results will have- important implications for models of tropospheric photochemistry.
Evolution
DAVID Deparhnent
of the atmosphere
VOLMAN
and D.R.
of Chemistry,
MARTINEZ
Universiry
of Culifornia,
Davis,
CA 95616 (U.S.A.)
P. A. LEIGHTON Department
of Chemistry,
Stanford
University,
Stanford,
CA 9430.5 (U.S.A.)
Current concepts of the Earth are as follows: its age is 4.6 x lo9 years; it was formed by the aggregation of cold particles; the gravitational potential energy of accretion and radioactivity produced a magma in the interior; the release of volatile components produced the oceans and the atmosphere. The primary volatile compounds were probably as follows (in decreasing amounts): H,O; CO2 (or CH,); HCI; H,S; N2 (or NH,); Hz. From this information and also the supposition that the release occurred by a first-order rate process, we made preliminary calculations of the composition of the atmosphere at several time intervals. At this stage we put primary emphasis on photochemical processes. With the assumption that carbon and nitrogen were released as CO2 and Nz, our results indicate that our model can probably yield the current composition of the atmosphere.
Photodecomposition of organic compounds under simulated atmospheric conditions
M. MANSOUR, lnstitutji2r
H. PARLAR
tlkologbche
Chemie
and F. KORTB der GSF, Schulstrasse
IO, D-8050
Freising-Attaching
(T;‘.R.G.)
The organic compounds play an important role in various fields. They present great advantages not only for agriculture and nutrition but also for the chemical and cosmetic industries. A great number of these chemical substances may undergo transformations or degradation under the influence of natural light or UV radiation, thus giving rise to other compounds. In our study of chemical substances in the adsorbed
tant for several stable atmospheric species. Experiments are in progress to investigate free-radical reactants and to check for reactions that may be catalyzed by atmsopheric surfaces. The results will have- important implications for models of tropospheric photochemistry.
Evolution
DAVID Deparhnent
of the atmosphere
VOLMAN
and D.R.
of Chemistry,
MARTINEZ
Universiry
of Culifornia,
Davis,
CA 95616 (U.S.A.)
P. A. LEIGHTON Department
of Chemistry,
Stanford
University,
Stanford,
CA 9430.5 (U.S.A.)
Current concepts of the Earth are as follows: its age is 4.6 x lo9 years; it was formed by the aggregation of cold particles; the gravitational potential energy of accretion and radioactivity produced a magma in the interior; the release of volatile components produced the oceans and the atmosphere. The primary volatile compounds were probably as follows (in decreasing amounts): H,O; CO2 (or CH,); HCI; H,S; N2 (or NH,); Hz. From this information and also the supposition that the release occurred by a first-order rate process, we made preliminary calculations of the composition of the atmosphere at several time intervals. At this stage we put primary emphasis on photochemical processes. With the assumption that carbon and nitrogen were released as CO2 and Nz, our results indicate that our model can probably yield the current composition of the atmosphere.
Photodecomposition of organic compounds under simulated atmospheric conditions
M. MANSOUR, lnstitutji2r
H. PARLAR
tlkologbche
Chemie
and F. KORTB der GSF, Schulstrasse
IO, D-8050
Freising-Attaching
(T;‘.R.G.)
The organic compounds play an important role in various fields. They present great advantages not only for agriculture and nutrition but also for the chemical and cosmetic industries. A great number of these chemical substances may undergo transformations or degradation under the influence of natural light or UV radiation, thus giving rise to other compounds. In our study of chemical substances in the adsorbed