by E. B. Rudnyi
It has been found that in the vapors of inorganic compounds at high temperatures there are stable negative ions. It allows us to study these ions, to determine their thermodynamic properties (e.g. electron affinity) and to employ them as a tool for traditional thermodynamic measurements.
See also publications.
All the experiments have been done with the magnet mass spectrometer MKh-1303 re-equipped for ion-molecule equilibria method.
Does sulfate anion SO4(2-) exist?
This is a discussion that took place on USENET in 1993. See also
E. B. Rudnyi, L. N. Sidorov, O. M. Vovk.
Structure of Alkali-Metals Sulfates in Gas and Condensed Phases.
Izv. Vys. Ucheb. Zaved., Khim. Khim. Tekh., 1989, v. 32, N 5, p. 3-12 (in Russian).
Reprint in Russian.