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We present measurements of the diffusion-limited growth of ice crystals fromwater vapor at a temperature of -5 C, in air at a pressure of $p_{air}=1$ bar.Starting with thin, c-axis ice needle crystals, the subsequent growthmorphologies ranged from solid prismatic columns to hollow columns to complex"fishbone" dendritic structures as the supersaturation was increased. Wemodeled the simpler morphologies using analytical techniques together with acellular-automata method that yields faceted crystalline structures indiffusion-limited growth. We found that the molecular attachment coefficient$\alpha_{prism}$ on faceted prism surfaces in air at -5 C is substantiallylower than that measured at low background air pressure. Our data show thatincreasing $p_{air}$ from 0.01 to 1 bar reduces $\alpha_{prism}$ by nearly twoorders of magnitude at this temperature. In contrast, we find that$\alpha_{basil}$ is essentially unaffected by air pressure over this range.These and other measurements indicate that ice surfaces near the melting pointundergo a series of complex structural and dynamical changes with temperaturethat remain largely unexplained at even a qualitative level.

Toward a Comprehensive Model of Snow Crystal Growth: 5. Measurements of Changes in Attachment Kinetics from Background Gas Interactions at -5 C