Accession Number : ADP007074

Title :   Integration of the Schroedinger Equation on a Massively Parallel Processor,

Corporate Author : NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD

Personal Author(s) : Parker, Jonoathan ; Blodgett-Ford, Sayoko ; Clark, Charles W.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : We use a massively parallel computer to integrate the time-dependent Schrodinger equation for hydrogen in high-intensity radiation fields. Photoelectron and harmonic-radiation spectra are presented. The behavior of atoms in strong radiation fields depends critically upon the time evolution of the field. For example, it has been found that above-threshold ionization (ATI) spectra show radical changes as the duration of the exciting laser pulse decreases; there is also theoretical evidence for novel phenomena, such as population trapping, which occur only for relatively short pulses. In order to treat problems of this sort theoretically, one must employ methods that accommodate general time variation of the radiation field. The most direct such method is numerical integration of the time-dependent Schrodinger equation. This would be an entirely non-controversial approach if vast computational resources were not required to implement it in practice. To data there have been only a few reports of direct integration of the time-dependent Schrodinger equation for a three dimensional, one-electron atom in a radiation field.

Descriptors :   *PARALLEL PROCESSORS, *SCHRODINGER EQUATION, *COHERENT OPTICAL RADIATION, COMPUTER ARCHITECTURE, ATOMIC SPECTRA, SHORT WAVELENGTHS, COHERENT RADIATION, PHOTOELECTRONS, HARMONICS, IONIZATION, SYMPOSIA.

Subject Categories : Computer Hardware
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE