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. The evaporation flux Jev ( H2O ) of H2O from HCl -doped typically 1.5  µm or so thick vapor-depositedice films has been measured in a combined quartz crystalmicrobalance (QCMB)–residual gas mass spectrometry (MS) experiment. Jev ( H2O ) has been found to show complex behavior and tobe a function of the average mole fraction χHCl of HCl inthe ice film ranging from 6×1014 to 3×1017  molecule cm −2  s −1 at 174–210 K for initialvalues χ HCl 0 ranging from 5 × 10 - 5 to 3 × 10 - 3 at the start of the evaporation. The dose of HCl onice was in the range of 1 to 40 formal monolayers and the H2O vaporpressure was independent of χHCl within the measured range andequal to that of pure ice down to 80 nm thickness. The dependence of Jev ( H2O ) with increasing average χHCl wascorrelated with (a) the evaporation range rb∕e parameter, that is, the ratio of Jev ( H2O ) just before HCldoping of the pure ice film and Jev ( H2O ) after observable HCl desorption towards the end of film evaporation, and (b) theremaining thickness dD below which Jev ( H2O )decreases to less than 85 % of pure ice. The dependence of Jev ( H2O ) with increasing average χHCl from HCl -doped ice films suggests two limiting data sets, one associatedwith the occurrence of a two-phase pure ice/crystalline HCl hydrate binaryphase (set A) and the other with a single-phase amorphous HCl∕H2O binary mixture (set B). The measured values of Jev ( H2O )may lead to significant evaporative lifetime extensions of HCl -contaminated ice cloud particles under atmospheric conditions,regardless of whether the structure corresponds to an amorphous orcrystalline state of the HCl∕H2O aggregate.

atmospheric chemistry and physics

The influence of HCl on the evaporation rates of H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O over water ice in the range 188 to 210 K at small average concentrations