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Light from a tungsten strip lamp was projected through the positive column of a cesium discharge onto the slit of a spectrograph, and the lamp temperatures determined at which the cesium lines disappeared against the continuous background. Measurements were made on the lines 686P to 68llP at different pressures and discharge currents. The reversal temperature decreases from the first to the third line and beyond the third there is no measurable difference. It increases with increasing current and with decreasing pressure. The number of atoms in an excited state is given by an equation of the form of the Boltzmann equation, with the reversal temperature replacing the equilibrium t emperature. The number per cubic centimeter ranges in magnitude from 1012 for the first P state to 106 for the highest states. In the range of conditions studied it was independent of pressure at constant current. CONTENTS Page

Reversal temperature and population of excited states in the cesium discharge