Accession Number : AD0476157


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


Descriptive Note : Quarterly progress rept. no. 4, Apr-Jun 65,


Corporate Author : MITHRAS CAMBRIDGE MA


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


Report Date : Dec 1965


Pagination or Media Count : 19


Abstract : The first objective is the study of various effects of uLaser 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. Effects of a Laser beam incident on a dispersion of carbon particles in air were studied to determine if the presence of absorbing particles has an effect on air activation. When the laser beam is Q-switched, a cloud is produced from surfaces, such as aluminum or styrofoam accompanied by the ejection of some material from the surface. A wedge filter spectrometer has been constructed and tested with a neon and fluorescent lamp. From NMR studies of dimethyl ethylphosphonate (DMEP) it was found that the ethyl resonances contained second-order features and, therefore, it was not possible to determine a relaxation time for the methylene and methyl protons of the ethyl group specifically. An overall relaxation time was obtained for the ethyl spin system, but these data are not comparable to the methyl relaxation time of DMMP. The observation of ionization produced by the laser beam just below the breakdown threshold is important in theories of gaseous breakdown. Cloud chamber observations indicate that the Laser beam produces ion pairs, which as slightly higher Laser intensities precipitate the avalanche process of breakdown. The thermal phenomena observed indicate the usefulness of the cloud chamber as a means of observing the volume distribution of temperature gradients. Thus, the diffusion of thermal energy following breakdown can be observed.


Descriptors :   *ESTERS , DAMAGE , LASERS , NUCLEATION , PHOSPHONIC ACIDS , CONDENSATION , AEROSOLS , FOG , VAPORS , CARBON , ALUMINUM , NUCLEAR MAGNETIC RESONANCE , RELAXATION TIME , IONIZATION , CLOUD CHAMBERS , EXPANDED PLASTICS , STYRENE PLASTICS , SURFACE PROPERTIES , PARAMAGNETIC RESONANCE , AIR , EXCITATION , CONDENSATION TRAILS , BEAMS(ELECTROMAGNETIC) , SCATTERING , TEMPERATURE , TEMPERATURE


Subject Categories : Lasers and Masers


Distribution Statement : APPROVED FOR PUBLIC RELEASE