The non-LTE excitation/ionization code GALAXY

In this paper we describe the computer code GALAXY which calculates the excitation and ionization of a plasma, including the effect of the radiation field, whether incident on the plasma or generated internally through the optical depth of the lines. In the absence of atomic data provided by the user, GALAXY calculates energy levels and the electron collisional and radiative rates which link them, using simple scaled-hydrogenic expressions. For relatively highly ionized systems this approach is found to be sufficiently accurate to be useful in studies of high-power laser-produced plasmas.

[1]  Chandler,et al.  Demonstration of a narrow-divergence x-ray laser in neonlike titanium. , 1990, Physical review. A, Atomic, molecular, and optical physics.

[2]  S. Rose.  The effect of an ambient radiation field on the state of ionization in a laser-produced plasma , 1995 .

[3]  F. Irons.  The escape factor in plasma spectroscopy—II. The case of radiative decay , 1979 .

[4]  J. Bauche,et al.  Transition Arrays in the Spectra of Ionized Atoms , 1988 .

[5]  F. Irons.  The escape factor in plasma spectroscopy—III. Two case studies , 1979 .

[6]  Jack W. Davis,et al.  Density effects on the spectral emission of a high temperature argon plasma , 1982 .

[7]  Ian P. Grant,et al.  RELATIVISTIC CALCULATION OF ATOMIC STRUCTURES. , 1970 .

[8]  Y. T. Lee.  A model for ionization balance and L-shell spectroscopy of non-LTE plasmas. , 1987 .

[9]  J. Davis,et al.  Soft-x-ray and x-ray ultraviolet radiation from high-density aluminum plasmas , 1981 .

[10]  W. Alley,et al.  Calculation of gain at X-ray wavelengths resulting from optical pumping of helium-like ions , 1982 .

[11]  Ian P. Grant,et al.  An atomic multiconfigurational Dirac-Fock package , 1984 .

[12]  W. Sooy,et al.  Very long lasers. , 1974, Applied optics.

[13]  F. Irons.  The escape factor in plasma spectroscopy. I - The escape factor defined and evaluated. II - The case of radiative decay. III - Two case studies , 1979 .

[14]  E A Chandler,et al.  Reinvestigating the early resonantly photopumped x-ray laser schemes. , 1992, Applied optics.

[15]  I. S. Bowen.  THE EXCITATION OF THE PERMITTED O III NEBULAR LINES , 1934 .

[16]  P. Judge.  The excitation of S I emission lines in chromospheres of late-type giant stars , 1988 .

[17]  H. Bethe,et al.  Quantum Mechanics of One- and Two-Electron Atoms , 1957 .

[18]  W. Huebner,et al.  Photoelectric cross sections for ions scaled from their neutral atoms , 1978 .