Theoretical Chemistry of Molecular Processes in Atmospheric Environment

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Computational chemistry now not only helps to analyze the experimental data but also provides original data and information on chemical and physical problems. The atmospheres of the earth, the sun and planets consist mostly of simple molecules. The molecular species involved in the chemical processes in the troposphere and stratosphere of the earth are also not large molecules except for biological substances. Therefore, computational chemistry has a extremely large potentiality in the research of the atmospheric environment. Lt is, however, not much explored yet. Under this project, we have studied the following subjects to demonstrate it.1) Accurate calculations of some spectroscopic properties of the basic molecules such as N_2 and CO.2) Structures and spectroscopic characteristics of water cluster anions and hydrated group 1 metal clusters. The finding of a new type of bonding, electron-hydrogen bond.3) The reactions of saturated hydrocarbons with a hydroxyl radical.4)A series of reactions initiated by the reaction of isoprene with a hydroxyl rqadical.5) The formation reactions of H_3O^+ at the D region of the ionosphere.6) The development of the BSSE free molecular orbital theories with projection operator formalism.7) Structures and stability of a Group 1 metal ion solvated with rare gas atoms.