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tially separate components. The role of ion-molecule complexes has long been postulated in mass ~pectrometry,['~] but was based. in general. on indirect evidence from the fragmentation pattern of excited species from the ionization of molecules in which the putative components of the complex were initially covalently bound. In the specific case of alkylbenzenes. irrefutable mass spectrometric evidence is lacking for complexes such iis 2; results of molecular orbital ~alculations'~"~ do not appear inconsistent with ours.The gmcous s:iinpIc\ fix the radiolytic experimenls were prepared in se;iled 135 mL glass \cssels. iri-.idiatrd in a 220 Gainmacell (Nuclear Canada Ltd.). fitted with a thernio\tat. The gaseh and the chemicals used were research-grade products from coininti-cia1 source\. The radiolytic products were analyzed h) GC;MS (50 m long. 0.2 inin i . d fuxd d i c a column, coated with a 0.5 pm methylsilicons tilni: VG Micronia\?, TRIO quadrupolc mass spectrometer). The FT-ICR experiments were pcrlorinrd with .I Brukcr Spectrospin Apex TM 47e spectrometer equipped with a n exteriii ion miircc

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A transistorized Pierce‐Miller‐oscillator is described which can be used to excite a quartz vibrator in contact with a solution. Changes of the resonance frequency of the quartz induced by deposition or dissolution of substances on one of its surfaces can be measured. We also describe a simple teflon holder which allows fixation of the crystal in a position in which only one of its faces is in contact with the solution.—The influence of simultaneous gas evolution on the performance of the balance is discussed. Preliminary results on the role of hydrides during nickel deposition and dissolution are presented and compared with literature data.

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