Accession Number : ADP007073

Title :   Calculations of High-Intensity Multiphoton Ionization and Photoemission from Atoms,

Corporate Author : LAWRENCE LIVERMORE NATIONAL LAB CA

Personal Author(s) : Kulander, K. C. ; Schafer, K. J. ; Krause, J. L.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : A method which involves the direct solution of the time dependent Schrodinger equations has been used in studies of the dynamics of excitation of and emission from atoms in intense, pulsed laser fields. A surprising array of effects have been observed during high-intensity, short-pulse laser excitation of atoms and molecules. To model the results of these measurements, we have developed methods to solve the time-dependent Schrodinger equation for an atom in a time varying, classical electromagnetic field. Studies on may atomic and molecular systems have been performed over a range of intensities from the regime within which perturbative techniques are valid up to field strengths well above an atomic unit (I > (3.51 x 10 to the 16th W)/sq. cm.). These calculations have provided predictions for ionization rates, 1 photoelectron energy and angular distributions and photoemission rates. The effects of ac Stark shifted and intensity broadened intermediate states on the emission processes have been investigated.

Descriptors :   *PULSED LASERS, *COHERENT OPTICAL RADIATION, *ATOMIC SPECTRA, *PHOTOELECTRONS, SCHRODINGER EQUATION, SHORT WAVELENGTHS, EXCITATION, COHERENT RADIATION, ELECTROMAGNETIC FIELDS, IONIZATION, STARK EFFECT, HARMONICS, ATOMS, SYMPOSIA.

Subject Categories : Lasers and Masers
      Optics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE