The Fe atomic absorption spectrum of low-pressure oxyacetylene flames seeded with iron pentacarbonyl solutions in benzene is studied. In order to arrive at quantitative results a continuum source is used and the "total absorption" data are analyzed with the curve of growth for a single spectral line. Absorption is measured from four low-lying <i>a</i><sup>5</sup><i>D</i> levels including the <i>a</i><sup>5</sup><i>D</i><sub>4</sub> ground state and two <i>a</i><sup>5</sup><i>F</i> levels, the latter lying almost 1 eV above the ground state.

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