electrospray ionization M. Dole, L. L. Mack, R. L. Hines, R. C. Mobley, L. D. Ferguson, M. B. Alice. J. Chem. Phys. 49, 2240 (1968). ESI electrospray ionization J. B. Fenn, M. Mann, C. K. Meng, S. F. Wong, C. M. Whitehouse. Science 246, 64 (1989). ionspray The term ionspray is deprecated unless describing the commercial product. Spray ionization process in which either cations or anions in solution are transferred to the gas phase via formation and desolvation at atmospheric pressure of a stream of highly charged droplets that result from applying a potential difference between the tip of the electrospray needle containing the solution and a counter electrode. [IUPAC] K. K. Murray, R. K. Boyd, M. N. Eberlin, G. J. Langley, L. Li and Y. Naito, Pure Appl. Chem., 2013, 85, 1515-1609 spray ionization