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Uptake of atmospheric molecules by ice nanoparticles: Pickup cross sections
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Image of FIG. 1.
FIG. 1.

Fragment ion mass spectrum of (H2O) N clusters. The inset shows an example of the measured velocity distribution for the m/z = 379 amu mass peak with the Gaussian fit (line).

Image of FIG. 2.
FIG. 2.

The relative velocity dependence on the pickup gas pressure p for H2O (circles), NO (squares), and NO2 (triangles) molecules on (H2O) N clusters 260 with the linear fits (lines).

Image of FIG. 3.
FIG. 3.

The pickup cross sections for atmospheric molecules H2O , CH4, NO, NO2, HCl, HBr, CH3OH, and CH3CH2OH on (H2O) N clusters 260. Horizontal line represents the geometrical cross section.

Image of FIG. 4.
FIG. 4.

(Top panel) The MD simulation geometry for one trajectory. (Graphs) The calculated cluster velocity after the collision as a function of the projectile impact parameter. The individual trajectories are categorized as sticking (crosses) or nonsticking (open circles). The line is a fit of the step function f(b) determining the maximum impact parameter b max , Eq. (8).

Image of FIG. 5.
FIG. 5.

Cross sections for the pickup of H2O molecules on (H2O) N . The full circle is the experimental value for 260, the crosses are calculated values for four different sizes of water cluster. The line indicates the corresponding geometrical cross sections calculated from van der Waals radius of H2O, Eq. (7).


Generic image for table
Table I.

Cross sections for pickup of several molecules on (H2O) N , 260. The corresponding geometrical cross section is σ g ≈ 400 Å2, and the simulated cross section for water molecules was σ s ≈ 946 Å2.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Uptake of atmospheric molecules by ice nanoparticles: Pickup cross sections