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A fibre-coupled UHV-compatible variable angle reflection-absorption UV/visible spectrometer.

J W Stubbing1, T L Salter1, W A Brown1

  • 1Department of Chemistry, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QJ, United Kingdom.

The Review of Scientific Instruments
|June 6, 2018
PubMed
Summary
This summary is machine-generated.

We developed a new spectrometer to measure the optical properties of ice films under space-like conditions. This instrument accurately determined the refractive index and thickness of amorphous benzene ice relevant for astrophysics.

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Area of Science:

  • Astrochemistry
  • Spectroscopy
  • Materials Science

Background:

  • Accurate modeling of radiative transfer and spectra in space requires precise optical constants for ice films.
  • Astronomical conditions necessitate measurements under ultra-high vacuum (UHV) and cryogenic cooling.
  • Existing methods may not meet the stringent requirements for UHV and variable geometry.

Purpose of the Study:

  • To present a novel UV/visible reflection-absorption spectrometer designed for measuring ice film properties.
  • To enable accurate determination of refractive index (n) and thickness (d) under UHV and cryogenic conditions.
  • To validate the instrument's performance using amorphous benzene ice as a test case.

Main Methods:

  • Development of a UHV-compatible reflection-absorption spectrometer.
  • Incorporation of a key stainless steel rhombus design with an external linear drive for variable reflection geometry.
  • Analysis of UV/visible spectra to derive optical constants.

Main Results:

  • The spectrometer successfully determined the refractive index (n) and thickness (d) of amorphous benzene ice films.
  • Film thickness (d) showed a linear correlation with surface exposure.
  • A refractive index (n) of 1.43 ± 0.07 was determined for amorphous benzene ice.

Conclusions:

  • The novel spectrometer is a viable tool for characterizing ice films under astrophysically relevant conditions.
  • The determined optical properties of amorphous benzene ice contribute to more accurate space modeling.
  • The instrument's design facilitates ease of use and UHV compatibility for advanced research.