The layer of plasma behind reflected shock waves, which were produced in a T-tube filled with a helium-oxygen mixture, served as a high-temperature light source for the measurement of relative oscillator strengths of some 0 ii and 0 iii lines. Densities and temperatures were determined using the line-broadening data of some neutral and ionized helium lines as well as their relative intensities. Some relative 0 ii and 0 iii oscillator strengths were then determined by intensity measurements, using a scanning technique. The 011 results compared very well with previous work employing a high-current arc. Furthermore, for all measured oscillator strengths, theoretical values were obtained from the Coulomb approximation. The relative values from theory and experiment were found to be in satisfactory agreement. Absolute 0111 oscillator strengths could not be given with certainty due mainly to the rapid time characteristics of the source which made the establishment of an equilibrium population in the second ionization stage of oxygen uncertain.
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Berg et al. (1964) studied this question.