Absolute measurement of the photoionization cross section of atomic hydrogen with a shock tube for the extreme ultraviolet

Physics – General Physics

Scientific paper

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Atomic Excitations, Far Ultraviolet Radiation, Hydrogen Atoms, Ionization Cross Sections, Photoionization, Shock Heating, Gas Dissociation, Gas Mixtures, Neon, Photoabsorption, Pressure Effects, Shock Tubes, Temperature Measurement

Scientific paper

The paper reports an experiment which is part of a program to measure the absolute values of the atomic photoionization cross sections of astrophysically abundant elements, particularly in stars and planetary atmospheres. An aerodynamic pressure-driven shock tube constructed from stainless steel with a quadratic cross section was used to measure the photoionization cross section of H I at 19 wavelength points from 910 to 609 A with experimental uncertainties between 7 and 20%. The shock tube was used to produce fully dissociated hydrogen and neon mixtures for the photoabsorption measurements.

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