Observation of the Unidentified Infrared Bands in the Laboratory: Anti-Stokes Stimulated Raman Spectroscopy of a Rydberg Matter Surface Boundary Layer

Details Observation of the Unidentified Infrared Bands in the Laboratory: Anti-Stokes Stimulated Raman Spectroscopy of a Rydberg Matter Surface Boundary Layer Observation of the Unidentified Infrared Bands in the Laboratory: Anti-Stokes Stimulated Raman Spectroscopy of a Rydberg Matter Surface Boundary Layer

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...548l.249h&link_type=abstract

The Astrophysical Journal, Volume 548, Issue 2, pp. L249-L252.

Astronomy and Astrophysics

Astronomy

17

Infrared: Ism, Ism: General, Ism: Lines And Bands, Line: Formation, Line: Identification, Molecular Processes

Scientific paper

The recent proposal that the origin of the so-called unidentified bands observed in emission in the infrared from interstellar space is Rydberg matter has been tested experimentally. The best-known source of alkali and H2 Rydberg states and Rydberg matter clusters, a K impregnated iron oxide catalyst, has been studied spectroscopically at pressures down to 10-5 mbar. The spectroscopic method used is anti-Stokes stimulated Raman, which employs a small He-Ne laser. The system in the surface boundary layer is concluded to be inverted since no corresponding Stokes transitions are observed and alkali Rydberg states and vibrationally excited molecules, e.g., H2, can be detected on the surface. The main unidentified infrared (UIR) band observed lies between 5.9 and 8.6 μm and corresponds to two-electron de-excitation of the Rydberg matter from high n levels down to n=16 and 18. Good agreement with observations for UIR spectra of type A and B is found in this region.

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