Artigo Revisado por pares

Refractive index and density of vapor‐deposited ice

1995; American Geophysical Union; Volume: 22; Issue: 24 Linguagem: Inglês

10.1029/95gl03504

ISSN

1944-8007

Autores

Brian Berland, David E. Brown, Margaret A. Tolbert, Steven M. George,

Tópico(s)

Advanced Fiber Optic Sensors

Resumo

The refractive indices of vapor‐deposited ice films were measured versus substrate temperature from 35–140 K and H 2 O pressure from 1.9 × 10 −7 –9.5 × 10 −5 Torr using optical interference techniques. The refractive indices were measured for ice films deposited on a cooled, single‐crystal Al 2 O 3 substrate in vacuum. Ice densities were calculated from these refractive indices using the Lorentz‐Lorenz relationship. Above 120 K, the ice films had a refractive index of n=1.31 and a density of ρ=0.93 g/cm³. Significantly lower refractive indices and densities were found at lower temperatures and higher H 2 O fluxes that were consistent with microporous ices. A refractive index of n=1.24 and density of ρ=0.68 g/cm³ were determined at 35 K and an H 2 O pressure of 4 × 10 −6 Torr. Above 35 K, the refractive index and density progressively increased with increasing temperature and decreasing H 2 O flux. The ice densities observed can be explained qualitatively using a ballistic deposition model. Estimates are also obtained for the surface diffusion of H 2 O on vapor‐deposited ice.

Referência(s)
Altmetric
PlumX