Abstract
The anomalous rotation discovered by Richardson in the molecular spectrum of hydrogen mixed with helium was investigated. Helium was found to decrease vibration and increase rotation of the (0 - 0) bands in agreement with the results of O. W. Richardson and A. S. Roy. For high pressures of helium (400 mm) the rotation was also reduced. At liquid-air temperature the anomalous rotation was less marked than at room temperature. No anomalous rotation was observed in the (3 - 3) and (2 - 2) bands. These results agree with the process proposed by O. Oldenberg in which collisions between an excited hydrogen molecule and helium atoms change part of the vibration of the hydrogen molecule into rotation.
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