Accession Number : ADA294538

Title :   Studies of Mechanisms of Short Wavelength Generation with Strong-Field Interactions.

Descriptive Note : Final rept. 1 Dec 91-31 Oct 94,

Corporate Author : ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OF PHYSICS

Personal Author(s) : Rhodes, Charles K.

PDF Url : ADA294538

Report Date : 31 OCT 1994

Pagination or Media Count : 112

Abstract : The development of a unified picture of short-pulse high-intensity multiphoton processes, embracing, atoms, molecules, and solids, appears possible through the study of clusters. Of particular significance are possible intra-cluster processes that can influence the mechanism of ionization and lead to the production of inner-shell vacancies. Inner-shell excitation leading to prompt X-ray emission is specifically considered and the treatment leads to the definition of a critical cluster size n(sub c) representing the achievement of maximal X-ray emission from the ensemble. These results suggest the possibility of designing a new class of molecular materials optimized for the efficient production and amplification of X-ray. Recent experiments, specifically designed to evaluate certain essential predictions of the cluster picture, have furnished considerable supporting evidence for the main features of the proposed model. These studies, which involved Kr and Xe, (1) established the crucial role of cluster formation in the generation of soft X-ray (approx. 80 - 150 eV) emission, (2) verified the scaling of this new phenomenon in to the kilovolt (approx. 800 - 2100 eV) region, (3) provided important insights concerning the dynamical character of the strong-field coupling to the clusters, (4) demonstrated the production of "hollow" atoms, and (5) combined the cluster excitation with a recently discovered mode of channeled propagation. These results strongly indicate that the predicted amplification can be achieved. jg

Descriptors :   *INTERACTIONS, *X RAYS, *CLUSTERING, *IONIZATION, *AMPLIFICATION, *SHORT WAVELENGTHS, *SHORT PULSES, EMISSION, PRODUCTION, SIZES(DIMENSIONS), DYNAMICS, MOLECULES, MATERIALS, COMPOSITE MATERIALS, EXCITATION, INTENSITY, EFFICIENCY, ATOMS, SOLIDS, SOFT X RAYS, PHOTONS, VACANCIES(CRYSTAL DEFECTS), PICTURES, XENON, KRYPTON.

Subject Categories : Physical Chemistry
      Inorganic Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Nuclear Physics & Elementary Particle Physics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE