SPECTROMETRIC STUDIES OF FAST REACTIONS.
INDIANA UNIV BLOOMINGTON DEPT OF CHEMISTRY
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The project was undertaken in order to develop and demonstrate new spectroscopic procedures for studying both the detailed path and the elementary processes of photolytically initiated explosions similar in some respects to combustion reactions which also proceed by free radical and energy chain processes. Following the development of a highly reproducible reaction system, different spectroscopic features of the same system are studied by repeating the reaction. Special precautions to ensure that the system is homogeneous tend to isolate the chemical dynamics part of the combustion problem from the fluid dynamics part. With long absorption path and low sample pressure the time resolution of the measurements is reasonably comparable with the time between intermolecular collisions. A fast, high resolution spectrometer specifically designed for this work resolves transient energy features such as the rotational fine structure of free radical absorption with a time resolution of about a microsecond. In the photolytic explosion of ozone the time dependence of the ozone concentration, ozone vibrational energy, vibrational energy of the oxygen product in levels up to 23 and the rotational-kinetic temperatures were correlated. In the photolytic explosion of Hydrazine the relative time dependence of NH2 radicals, NH radicals, hydrazine and a new transient spectrum not yet fully identified were compared. Author
- Radiation and Nuclear Chemistry
- Combustion and Ignition