SummaryThe shape of a collision-broadened spectral line depends on the assumptions made about the collision processes involved. If the collision cross section varies inversely as the relative speed of the colliding molecules, the half-width to the half-power points and to the points of steepest slope should be 1/27T1' and 1/(2";3)7T1' respectively, where l' is the mean interval between line-broadening collisions. It is shown that, in a gas of "hard-sphere" molecules, the shape of the line is modified and the above half-widths are reduced by' 6·4 and 9·7% respectively. While it is not suggested that gas molecules behave entirely as hard spheres, it is suggested that some deviations from the Van Vleck-Weisskopf-Lorentz shape may occur, and that it may be possible to detect these deviations experimentally.
SummaryThe measurements of the absolute intensities of Ou Ka radiation, isolated by means of balanced nickel and iron filters,. necessitated the determination of the quantum counting efficiency of three types of detectors: an end· window argon-filled Geiger counter, a two side-window, xenon-filled proportional counter, and a scintillation counter with NaITI crystal. It is shown that, provided the necessary corrections are made, results of absolute intensity measurements obtained with these three detectors show good agreement.
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