Abstract
Exchange between gaseous hydroxyl ion and hydrogen and water has been investigated by using two mass spectrometers and two modes of ionization. Exchange of OH/sup -/ and D/sub 2/ is a relatively slow reaction (collision efficiency = 2.9 x 10/sup -2/), and its rate constant exhibits a small negative temperature coefficient, k = CT/sup -0/ /sup 7/. The exchange of OD/sup -/ with H/sub 2/ is 30% slower than OH/sup -/ + D/sub 2/, the difference becoming less as the temperature increases. Exchange of OD/sup -/ with H/sub 2/O is fast (collision efficiency approx. 1). Exchange of OD/sup -/ with CH/sub 4/ and i-C/sub 4/H/sub 10/ has also been examined, but these reactions are very slow (k < or = 3 x 10/sup -13/ cm/sup 3//molecule s) and may well be zero.
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