ORIGIN OF CLUSTERS .1. CORRELATION OF LOW-TEMPERATURE FAST-ATOM-BOMBARDMENT MASS-SPECTRA WITH THE PHASE-DIAGRAM OF NACL-WATER SOLUTIONS

Correlations between the structure of samples of the frozen solutions of sodium chloride in water, produced at different parameters of the p hase diagram of this system, and the clusters pattern of the correspon ding low temperature fast atom bombardment mass spectra are establishe d. Using a model of the independent sputtering of ions from chemically different surface domains, it was concluded that the origin of differ ent types of clusters from different phases of the heterogeneous sampl es was: (H2OH+-from ice; (NaCl)(m) . Na+-from anhydrous NaCl; (H2O)(n) . Na+, (H2O)(n) .(NaCl)(m) . Na+, (NaCl)(m) . Na+-from the crystallin e hydrate NaCl . 2H(2)O. During the thawing of the samples two subsequ ent phase transitions with increasing temperature were observed, these are sublimation of ice and dehydration of the crystalline hydrate. Th e differences in the sputtering of (H2O)(n) . Na+ clusters from the cr ystalline hydrate and ice crystals with Na+ ion adsorbed on their surf aces are discussed.