The Interaction of Suspended Atmospheric Particles with Laser Radiation.
Technical rept. 1 Jun 71-31 Jul 72,
SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CALIF
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SUSPENDED PARTICLES. Initial breakdown in either the vaporized particle or in the shock-heated adjacent gas may result in a laser-supported detonation or in a subsonic ionization wave. The nonlinear, nonequilibrium kinetic equations describing the energy distribution of free electrons, the vibrational excitation of molecules, the dominant electronic excitation, attachment, and ionization reactions and their inverses, electron heating by the laser, and electron diffusion, are solved numerically. The dominant eigenvalue of the Jacobian of these equations is investigated as a criterion for breakdown. Calculations for vaporized silica and air at temperatures from 300K to 6000K under irradiation by a CO2 laser show expected lowering of breakdown threshold for preheated material. Heating of particle vapor and subsequent formation of a shock wave are calculated with a Lagrangian gasdynamic method. Preliminary theoretical predictions for the effects of particles on lowering of the air breakdown threshold are then obtained. Abstract Modified Abstract
- Atmospheric Physics
- Physical Chemistry
- Lasers and Masers