Abstract
With large supersaturation ratios, unit coefficients have been measured for condensation of normal-incident molecular beams of sodium chloride on clean (100) oriented single crystal surfaces of NaCl. Since α=1 for the composite molecular beam, individual coefficients for condensation of NaCl(g) and Na2Cl2(g) must have unit values under the conditions of these experiments. Over the range investigated, α is independent of molecular beam flux and surface temperature. A large flux of nitrogen on the surface during molecular beam deposition has no effect on α. Nonunit values of α correlate with the presence of relatively small amounts of hydrocarbons in the residual gas. The results of the present work on condensation on clean surfaces under ultrahigh vacuum differ from those previously reported for condensation of sodium chloride under high vacuum. A mechanism of condensation is proposed. Discrepancies between the present and previous results for condensation of sodium chloride are discussed.
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