Spectrograms were taken of Hß, HY and Hδ of hydrogen excited by condensed discharges for gas pressures from 2 to 135 mm. of mercury. At the highest pressure the photographic widths of the lines were nearly 100 A.U. Throughout the series of pressures the intensity of the central portions of Hß was maintained sensibly constant. Assuming that the widening was caused by disturbance of the uniformity of the radiation due to collisions of the radiating particles (as proposed by others), the widening of the lines with pressure was calculated and found to be considerably less than that observed. This result indicated that the assumption was inadequate, and that the widening should be attributed to other causes such as the effect of the electrical fields, as investigated by Merton (Proc. Roy. Soc., 92, 322, 1915).
Proceedings of the Iowa Academy of Science
©1922 Iowa Academy of Science, Inc.
Hulburt, E. O.
"The Broadening of the Balmer Lines of Hydrogen with Pressure,"
Proceedings of the Iowa Academy of Science, 29(1), 148-148.
Available at: https://scholarworks.uni.edu/pias/vol29/iss1/32