What is a supercritical fluid?
  Figure from:   http://en.wikipedia.org/wiki/Supercritical_fluid                                                                           {2}
  Why use supercritical fluids?
                                                                                   C60 Vapor Pressure
  Figures from: B. Brumfield.  Development of a quantum cascade laser based spectrometer for high-resolution spectroscopy of               {3}
          gas phase C .  UIUC, 2011.
                     60
  Why use supercritical fluids?
  Figures from: B. Brumfield.  Development of a quantum cascade laser based spectrometer for high-resolution spectroscopy of               {4}
          gas phase C .  UIUC, 2011.
                     60
  Why use supercritical fluids?
  Figure from:   B. E. Brumfield et al. Rev. Sci. Instrum. 81, 063102 (2010).                                                               {5}
  Why use supercritical fluids?
                                Estimated:
                                Observed:
                          (NEA ~0.6 ppm)
  Figures from: J. T. Stewart.  High-resolution infrared spectroscopy of large molecules and water clusters using quantum cascade              {6}
          lasers.  UIUC, 2013.