Accession Number : AD0468165

Title :   STUDIES OF THE EFFECT OF LASER RADIATION ON CHEMICAL ACTIVATION AND VAPOR FOG NUCLEATION.

Descriptive Note : Quarterly progress rept. no. 3, Jan-Mar 65,

Corporate Author : MITHRAS CAMBRIDGE MA

Personal Author(s) : Naiman, Charles S. ; DeWolf, Mary Yvonne ; Schwartz, Jack

Report Date : MAY 1965

Pagination or Media Count : 26

Abstract : The first objective is the study of various effects of laser radiation upon liquid systems comprised of, but not limited to, the compound dimethyl methylphosphonate. The second objective is to obtain basic information on the condensation of vapor or aerosol fogs as a result of laser radiation. Breakdown, the production of a high-temperature plasma, has been obtained in air, liquid DMMP and mixtures of air and DMMP vapors with a focused Q-switched 20 Mw laser pulse. Sequential photographs of the turbulence and eddies following breakdown in DMMP-air mixture were obtained. Preliminary studies with a diffraction grating show that the emission spectrum is a continuum. Ionization was produced by the focused Q-switched laser pulse just below the power threshold for breakdown. A cloud chamber has been assembled with DMMP as the eorking material. This chamber is a convient vessel for obtaining mixtures of DMMP vapor and air and other gases. EPR experiments with DMMP were attempted and DMMP was found to absorb microwave energy at K-band frequencies independent of applied magnetic field. Substitution of a slow wave structure for the cavity is expected to correct the difficulty. (Author)

Descriptors :   (*LASERS, LIQUIDS), (*CONDENSATION REACTIONS, LASERS), CLOUD CHAMBERS, PHOSPHONIC ACIDS, ESTERS, FOG, NUCLEATION, VAPORS, AEROSOLS, FREE RADICALS, GAS IONIZATION, AIR, SEQUENTIAL PHOTOGRAPHY, TURBULENCE, DIFFRACTION ANALYSIS, K BAND, PARAMAGNETIC RESONANCE, IONS, LUMINESCENCE, THERMAL PROPERTIES, NUCLEAR MAGNETIC RESONANCE, VAPOR PRESSURE, MEASUREMENT, PLASMAS(PHYSICS).

Distribution Statement : APPROVED FOR PUBLIC RELEASE