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The formation of small ammonia clusters is investigated experimentally with a supersonic free molecular jet of NH_3-X binary mixtures (X = Ar, He, N_2), with a special attention paid to the effect of second species X on the cluster formation. The ion currents of protonated ammonia clusters (NH_3)_nH^{+}(n=2-6) were measured with a combined cluster source system and a double focussing sector field...
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