DHp.1.05 — Diffuse Interstellar Bands - Lab Studies

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Aug 4th at 6:00 PM until 6:00 PM

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Author(s): Fred Johnson1

Institution(s): 1. CSUF

Experimental results will be presented, including IR, Raman, fluorescence and reflection data of the prime chromophore candidate- MgTBP (and similar porphyrins) taken at low temperature in both matrix and vapor phases. The totality of their inferred vibrational frequencies is invaluable in analyzing the published 400-500 DIBs. MgTBP is a highly fluorescent molecule, placed in a Shpolskii type matrix, and excited by blue stellar radiation. Almost 100 lab spectral lines can now be matched with their DIB counterparts, including the strongest DIBs 4428 Å and 6284 Ā to a precision of +/- 1 Å. The crystal field splitting of 36 cm -1, in the Shpolskii matrix, arising from the electronic origins of DIBs 6284Å and 6270Å, can be seen in over 35 pairs of DIBs in the most recent extended DIB list.