Links

Here are collected some links referring to research groups involved in the determination of mid-infrared optical constants of different types of aerosols, such as

• supercooled binary and ternary solution droplets composed of sulphuric acid, nitric acid, and water
• NAD ( = nitric acid dihydrate)
• NAT ( = nitric acid trihydrate)
• water ice
• supercooled water droplets

Please contact me if you want to suggest a new link to be added to this section.

• Dr. Alexander Zasetsky
  Contains the desription of an iterative procedure to retrieve optical constants from aerosol extinction spectra. The algorithm was applied to derive temperature-dependent complex refractive indices of ice and supercooled water.

 

• Optical Properties of Aerosols - a laboratory and modelling study
  Contains a new data set of temperature and composition-dependent optical constants for aqueous sulphuric acid (published in 2003). Ongoing work focusses on the temperature-dependent complex refractive index of supercooled binary HNO₃/H₂O and ternary H₂SO₄/HNO₃/H₂O aerosols.

 

• Margaret Tolbert research group
  Here you can download the first dat set of low-temperature mid-infrared complex refractive indices of aqueous sulfuric acid. Additionally, temperature-dependent optical constants of water ice in the near infrared are available.

 

• The Atmospheric Chemistry research group of IACETH
  Offers a refractive index calculator to estimate the refractive indices of H₂SO₄/HNO₃/H₂O solutions to stratospheric temperatures.

 

• DePaul University - Department of Chemistry - Richard F. Niedziela
  Determination of mid-IR real and imaginary complex refractive indices of organic compounds. An optical constant data base, listing the known complex refractive index data sets for a number of compounds, is under construction.

 

• The Rutherford Appleton Laboratory (RAL) Spectroscopy Group
  Within the project "Mapping of Polar Stratospheric Clouds and Ozone levels Relevant to the Region of Europe (MAPSCORE)", a database of refractive indices for relevant aerosols was compiled.

 

• Astrophysical Institute & University Observatory Jena
  Contains an extensive database of optical constants for silicates, oxides, sulfides, and carbon. From the web page of V. Ossenkopf you can download a program for the derivation of optical constants from transmission spectra of samples with inclusions of separated small spherical particles.

 

• Research Group "Heterogeneous Reactions" of ICG II, Research Centre Jülich
  Studies in an aerosol flow tube in which optical spectra (presently IR) and size distributions can be measured at the same time. This allows for the determination of optical constants of aerosols as function of their chemical composition by means of Mie calculations.

 

• Prof. P. Chylek, Dalhousie University, Halifax
  Have e.g. measured for the first time the absorption coefficient of supercooled water in the 0.65 to 2.5 mm spectral range.

 

• HITRAN2004 database
  Link to the HITRAN2004 molecular spectroscopic database. The pdf-file Aerosol-Readme.pdf lists the aerosol indices of refraction included in HITRAN.

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