Measurement of the oscillator strengths and autoionization widths of the neutral-aluminum multiplet 3s2 3p2 P0 - 3s 3p2 2P

view Abstract Citations (14) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Measurement of the oscillator strengths and autoionization widths of the neutral-aluminum multiplet 3s2 3p2 P0 - 3s 3p2 2P Lombardi, G. G. ; Cardon, B. L. ; Kurucz, R. L. Abstract The hook method is used in conjunction with absorption equivalent width measurements to determine the oscillator strengths and line widths of the Al I multiplet 3s2 3p2 P0 - 3s 3p2 2P at 176 nm. Autoionization is found to be the dominant decay channel for the two levels of the 3p2 2P term, with autoionizing widths of 4.0 and 0.87 x 10 to the 10th/sec for J of 3/2 and 1/2, respectively. The van der Waals scattering cross section for the Al I transition at 176.91 nm by He is determined to be (1.3 + or - 0.3) x 10 to the -14th sq cm at 2400 K, and a solar spectrum calculation centered at 176 nm shows that the Al I features are possible diagnostic probes of (1) solar non-LTE processes, and (2) the temperature minimum and structure of the lower chromosphere. Publication: The Astrophysical Journal Pub Date: September 1981 DOI: 10.1086/159249 Bibcode: 1981ApJ...248.1202L Keywords: Aluminum; Autoionization; Fine Structure; Solar Atmosphere; Solar Spectra; Spectral Line Width; Ionization Cross Sections; Metal Vapors; Molecular Oscillators; Radiative Transfer; Transition Probabilities; Solar Physics full text sources ADS |