Sl. Zhou et M. Hamburger, FORMATION OF SODIUM CLUSTER IONS IN ELECTROSPRAY MASS-SPECTROMETRY, Rapid communications in mass spectrometry, 10(7), 1996, pp. 797-800
A series of sodium cluster ions, such as Na+(NaCl)(n), Na+(HCOONa)(n)
and Na+(HCOONa)(n1)(CH3COONa)(n2), were observed in electrospray mass
spectrometry, These results support the electrophoretic separation mec
hanism for excess ions at droplet surface, and the charged residue mod
el for gas phase ion formation from highly-charged droplets.