Accession Number : ADA135415

Title :   Crossed Molecular Beam Studies of the Reactions of Oxygen and Fluorine Atoms.

Descriptive Note : Final technical rept. 1 Apr 75-30 Sep 83,

Corporate Author : CALIFORNIA UNIV BERKELEY DEPT OF CHEMISTRY

Personal Author(s) : Lee,Y T

PDF Url : ADA135415

Report Date : 09 Nov 1983

Pagination or Media Count : 29

Abstract : The title of this research contract describes the initial work done under the contract; after 1980 the research program was extended to the study of the primary decomposition of energetic materials and the dynamics of concerted reactions of organic molecules through cyclic transition states. The studies of the primary photodissociation of polyatomic molecules have been directed toward answering questions related to the primary decomposition of energetic materials and the dynamics of concerted reactions. A combination of the techniques of infrared multiphoton excitation and the molecular beam method has been used to carry out a series of these studies. In particular, the competition between simple bond fission reactions and concerted reactions were studied in detail in the infrared multiphoton dissociation of ethyl vinyl ehter and diethyl ether. The primary photodissociation of ozone was studied as it is important both as a test for theoretical models and as a source of O(1D) atoms in the atmosphere. The photodissociation of the energetic molecules nitromethane was investigated at 266 and at 193 nm. While no significant (less than 3 percent) dissociation occurred at 266 nm, the 193 excitation led to dissociation to CH3 and NO2 with a large fraction of the NO2 product being electronically excited and highly vibrationally excited. The photodissociation of ketene allowed a determination of the singlet-triplet splitting in methylene.

Descriptors :   *Polyatomic molecules, *Photodissociation, *Cross beam devices, Fluorine, Oxygen, Chemical reactions, Photofragment spectroscopy, Molecular beams, Energetic properties, Dynamics

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE