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Fig. 4

image

Coefficients of restitution normal and tangential to the colliding surfaces as a function of the normal and tangential impact velocity respectively. The chemical compositions are indicated by different colours and symbols: black plus symbols for pure water ice, red crosses for 5% methanol in water, and blue circles for 5% formic acid in water. a) Tangential coefficient of restitution for the target surface at 90° to the direction of travel (b/R = 0). b) Normal coefficient of restitution for the target surface at 90° to the direction of travel (b/R = 0). c) Tangential coefficient of restitution for the target surface at 60° to the direction of travel (b/R = 0.5). d) Normal coefficient of restitution for the target surface at 60° to the direction of travel (b/R = 0.5). e) Tangential coefficient of restitution for particle-particle collisions (b/R = 0.000.33). f) Normal coefficient of restitution for particle-particle collisions (b/R = 0.000.33).

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