Mobilities of gaseous ions in CH 3NO 2H 2 and CH 3CNH 2 mixtures

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Extending previous investigations by Loeb of mobilities in gaseous mixtures using his procedure except that the auxiliary field in these measurements was made equal to the advancing field thus giving absolute values of the mobilities, measurements of mobilities were made in mixtures of CH 3NO 2H2 and CH 3CNH 2. The mobilities in H 2 were 7.12 for the positive ions and 10.46 for the negative ions in cm./sec. per volt/cm. Those in CH 3NO 2 were 0.221 cm./sec. per volt/cm. for both ions and in CH 3CN they were 0.234 cm./sec. per volt/cm. for both ions. Both ion mobilities deviated from Blanc's law in CH 3NO 2 indicating the formation of complexes with the CH 3NO 2 ions somewhat greater in size than the normal ions in H 2. The molecules attached to negative ions somewhat less readily than to the positive ions but both final ions were of the same size. In CH 3CN mixtures both positive and negative ions deviated from Blanc's law, the positive ion showing more ready attachment of CH 3CN. The negative ion had consistently a higher mobility than the positive ion, a circumstance indicating a smaller ion and suggesting that the attaching molecule might not be CH 3CN but some impurity. Both ion addition products in CH 3CN are larger than the normal ion in H 2 but smaller than those in CH 3NO 2 as was to be expected.