Measurement of the photoionization cross section of neutral iron
- 1 November 1978
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 18 (5) , 2131-2134
- https://doi.org/10.1103/physreva.18.2131
Abstract
The photoionization cross section of neutral iron, in thermal equilibrium 2300 K, was measured to be () × at 1540 Å (8.05 eV). At this temperature more than 98% of the atoms are in the levels of the ground term. The iron vapor was produced in a resistively heated furnace, and the column density was determined by the hook method. The optical depth of the iron vapor was measured with a photoelectric detector. The absolute measurement of the cross section can be used to calibrate existing data which cover a wide range of wavelengths.
Keywords
This publication has 17 references indexed in Scilit:
- Oscillator strengths of Cr I lines lying between 200 and 541 nm from hook-method and absorption measurements in a furnaceProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1977
- Observation and interpretation of the photoionization cross section of the neutral iron atom (Fe I)Journal of Physics B: Atomic and Molecular Physics, 1977
- Structure of the solar chromosphere. II - The underlying photosphere and temperature-minimum regionThe Astrophysical Journal Supplement Series, 1976
- The spectrum of Cr I between 179.8 and 200 nm wavelengths, absorption cross sections, and oscillator strengthsProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1975
- Oscillator Strengths of Ultraviolet fe i Lines from Hook-Method Measurements on a FurnaceThe Astrophysical Journal, 1973
- Instrumentation for Combined Dispersion and Absorption Measurements in the VUVApplied Optics, 1973
- Oscillator Strengths of Weak fe i Resonance Lines Measured by Combined Hook and Absorption TechniquesThe Astrophysical Journal, 1972
- F i Ionization and Excitation Equilibrium in the Solar AtmosphereThe Astrophysical Journal, 1972
- Photoionization Cross Section of the Neutral Iron AtomPhysical Review A, 1972
- Radiative Opacity in Stellar Atmospheres. I. Metal Absorption CoefficientsThe Astrophysical Journal, 1968