Mobility of Mass-Analyzed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math>, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math>Ions in Hydrogen Gas

The mobilities of the positive ions ${\mathrm{H}}^{+}$, ${\mathrm{H}}_{3}^{+}$, and ${\mathrm{H}}_{5}^{+}$ in ${\mathrm{H}}_{2}$ gas have been measured, using the "four-gauze" electrical shutter method. The ions have been identified mass-spectrometrically. Measurements were made over a range of $\frac{E}{{p}_{0}}$ ($E=\mathrm{electric}\mathrm{field}\mathrm{intensity}$, ${p}_{0}=\mathrm{normalized}\mathrm{pressure}$) from 5.5 to 100 V per cm\ifmmode\times\else\texttimes\fi{}mm Hg and in a pressure range of from 0.5 to 1.6 mm Hg. The predominant ion is ${\mathrm{H}}_{3}^{+}$. The mobility ${\ensuremath{\mu}}_{0}$ corrected to 0\ifmmode^\circ\else\textdegree\fi{}C for the ${\mathrm{H}}^{+}$ ions was 14.4, for the ${\mathrm{H}}_{3}^{+}$ ions 10.2 and for the ${\mathrm{H}}_{5}^{+}$ ions 9.6 ${\mathrm{cm}}^{2}$/V\ifmmode\times\else\texttimes\fi{}sec at $\frac{E}{{p}_{0}}=10$ V/cm\ifmmode\times\else\texttimes\fi{}mm Hg. With increasing $\frac{E}{{p}_{0}}$, the mobility of the ${\mathrm{H}}^{+}$ ions decreases, that of the ${\mathrm{H}}_{3}^{+}$ ions increases to a maximum of 14.7 ${\mathrm{cm}}^{2}$/V sec at $\frac{E}{{p}_{0}}=60$ V/cm\ifmmode\times\else\texttimes\fi{}mm Hg and then decreases, and that of the ${\mathrm{H}}_{5}^{+}$ ions increases.

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