Abstract: | Liquid secondary ion mass spectra of choline and acetylcholine halides exhibit several series of cluster ions whose origins were investigated using B/E and B2/E linked-scan techniques. In the case of choline halides three series of cluster ions were identified as (Me3$ mathop {rm N}limits^ + $CH2CH2OH + nM), (Me3$ mathop {rm N}limits^ + $CH2CH2OMe + nM) and (Me3N$ mathop {rm N}limits^ + $CH2CH2OH · Me3$ mathop {rm N}limits^ + $CH2CH2O? + nM), while (CH3COOCH2CH2$ mathop {rm N}limits^ + $Me3 + nM), (Me3$ mathop {rm N}limits^ + $CH2CH2OH + nM) and (CH2 = CH$ mathop {rm N}limits^ + $Me3 + nM) were observed in the spectra of acetylcholine halides. For these cluster ions, bimolecular reactions induced on ion bombardment under secondary ion mass spectrometric conditions are discussed. |