Vibrational Spectra of Hot Dense Molecular Fluids: Tabletop Apparatus for Probing Planetary Interiors

Details Vibrational Spectra of Hot Dense Molecular Fluids: Tabletop Apparatus for Probing Planetary Interiors Vibrational Spectra of Hot Dense Molecular Fluids: Tabletop Apparatus for Probing Planetary Interiors

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.v41b..08b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #V41B-08

Physics

0350 Pressure, Density, And Temperature, 3924 High-Pressure Behavior, 3934 Optical, Infrared, And Raman Spectroscopy, 5754 Physical Properties Of Materials, 5794 Instruments And Techniques

Scientific paper

Spectroscopic information on simple molecules at high temperatures and pressures are necessary for understanding the interiors of the Jovian planets. These conditions easily exceed 2000K and 10 GPa. We shall demonstrate that it is possible to exceed those conditions (statically) and obtain spectroscopic information on such hot dense fluids. This experimental method requires the use of non-linear spectroscopy and CW laser heating on samples that are under pressure inside a diamond-anvil cell. Spectra are obtained by using a four wave mixing technique: Coherent Anti-Stokes Raman Spectroscopy. The sample heating is accomplished by using an in-situ microscopic tungsten toroid as a laser target. By combining these techniques simultaneously, vibrational spectra with relatively high signal to noise can be obtained despite the enormous thermal background generated by the incandescence of extremely hot laser heated material. Temperatures can be measured not only by fitting the Planck radiation to a graybody, but by the spectroscopic evidence of a Boltzmann distribution of molecules in their excited vibrational quantum levels. Our initial experiments will describe these technical developments and demonstrate their success using nitrogen samples.

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