Ammonium Adduct Ion in Ammonia Chemical Ionization Mass Spectrometry. 2 - Mechanism of Elimination of Neutrals from the Ammonium Adduct Ion

Article abstract of DOI:10.1002/oms.1210200708

The mechanism of elimination of ROH (R = H or CH3) from the ammonium adduct ion, ⁺, of 1-adamantanol and its methyl ether is examined by using linked-scan metastable ion spectra and by measuring the dependence of the peak intensity ratio ⁺/⁺ on ammonia pressure.For 1-adamantanol both S_Ni and S_N1 reactions are suggested in metastable ion decomposition, while only the S_N1 mechanism is operative in the ion source.For 1-adamantanol methyl ether the S_N1 reaction predominates both in metastable ion decomposition and in the ion source reaction.