Single photoionization of the Zn II ion in the photon energy range 17.5-90.0 eV: experiment and theory

• Measurements of the single-photoionization cross-section of Cu-like Zn+ ions are reported in the energy (wavelength) range 17.5 eV (708 angstrom) to 90 eV (138 angstrom). The measurements on this trans-Fe element were performed at the Advanced Light Source synchrotron radiation facility in Berkeley, California at a photon energy resolution of 17 meV using the photon-ion merged-beams end-station. Below 30 eV, the spectrum is dominated by excitation autoionizing resonance states. The experimental results are compared with large-scale photoionization cross-section calculations performed using a Dirac Coulomb R-matrix approximation. Comparisons are made with previous experimental studies, resonance states are identified and contributions from metastable states of Zn+ are determined.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

atomic data

atomic processes

scattering

giant branch stars

r-matrix theory

electron-impact ionization

absolute cross-sections

planetary-nebulae

zinc abundances

halo stars

oscillator-strengths

high-resolution

elements

Astronomy & Astrophysics

ang jj

1975

journal of physics b-atomic molecular and optical physics

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