MEASUREMENT OF THE OSCILLATOR STRENGTH OF THE NEUTRAL HELIUM RESONANCE LINE.
Scientific rept. no. 3 (Final) Aug 59-Oct 64,
MARYLAND UNIV COLLEGE PARK
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The f-value of the lambda 584 HeI line was determined from the saturated emission profile using an electromagnetic T-tube filled with a hydrogen-helium mixture as light source. Since the central saturation levels of this line and the higher series members could be connected by a smooth curve which with a small correction for detector response agreed with the relative blackbody intensity, these levels were identified with the blackbody corresponding to the measured plasma temperature, and this furnished the required calibration standard. The resulting value f 0.27 0.07 is consistent with most recent theoretical values. Author