THE EFFECTS of EXPERIMENTAL CONDITIONS on the REFRACTIVE INDEX and DENSITY of LOW-TEMPERATURE ICES: SOLID CARBON DIOXIDE

M. J. Loeffler, M. H. Moore, P. A. Gerakines

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We present the first study on the effects of the deposition technique on the measurements of the visible refractive index and the density of a low-temperature ice using solid carbon dioxide (CO2) at 14-70 K as an example. While our measurements generally agree with previous studies that show a dependence of index and density on temperature below 50 K, we also find that the measured values depend on the method used to create each sample. Below 50 K, we find that the refractive index varied by as much as 4% and the density by as much as 16% at a single temperature depending on the deposition method. We also show that the Lorentz-Lorenz approximation is valid for solid CO2 across the full 14-70 K temperature range, regardless of the deposition method used. Since the refractive index and density are important in calculations of optical constants and infrared (IR) band strengths of materials, our results suggest that the deposition method must be considered in cases where n vis and ρ are not measured in the same experimental setup where the IR spectral measurements are made.

Original languageEnglish (US)
Article number98
JournalAstrophysical Journal
Volume827
Issue number2
DOIs
StatePublished - Aug 20 2016
Externally publishedYes

Keywords

  • astrochemistry
  • methods: laboratory: molecular
  • methods: laboratory: solid state
  • planetary nebulae: general
  • radiative transfer
  • techniques: spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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