THE EFFECT OF LIGHT MOLECULES ON VIBRATIONAL RELAXATION IN OXYGEN.
MISSISSIPPI UNIV UNIVERSITY
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Sound absorption and velocity measurements have been made in O2 with added amounts of H2, D2 and He. The number of collisions, Z sub 10AB, necessary to de-excite the first vibrational state of O2 has been calculated from the measured relacation times. These values are in general agreement with values reported by Parker Holmes, Smith, and Tempest and White and Millikan. When log Z sub 10 AB is plotted vs the cube root of the reduced mass times the square of the vibrational frequency divided by the absolute temperature a linear relationship is found be tween the O2-H2 and the O2-He data. However Z sub 10 O2-D2 is unexpectedly longer than Z sub 10 O2-He. When the collision numbers, Z sub 10, for pure O2 and N2 are plot in this way they fall along a single curve. Author