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The results of the first precise measurement of the wavelength dependence of the photodetachment cross section of the negative atomic hydrogen ion in the range from 0.4 to 1.3 mu are reported. The measurement was accomplished by improving signal-to-noise ratio in the experiment through improvement of preamplifier detection sensitivity and elimination of background signals and by developing a direct, reliable method for relative determination of light intensity in the photon beam. (W.D.M.)
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Smith et al. (1959) studied this question.
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