Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713104j&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #131.04; Bulletin of the American Astronomical Society, Vol. 33, p.716
Astronomy and Astrophysics
Astronomy
Scientific paper
Results from an extended literature survey and a 35 year experimental spectroscopic program will be presented. These results enable the unraveling of the underlying code necessary for the identification of the dominant chromosphores responsible for the DIBs. The main chromophores are the thermodynamically stable tetrabenzoporphyrins (MgTBP and H2TBP). The large amount of spectroscopic data includes low temp. supersonically cooled vapor and quasaline matrix isolation spectra, as well as Raman and FTIR data. Electron bombardment (70 ev) of MgTBP and analysis via mass spectrometry of the resulting molecular fragments, reproduced 19 out of a possible 24 presently identified interstellar ``CHN type" interstellar molecules, including the enigmatic MgNC radical! Virtually all observed and newly discovered DIBs can now be readily assigned to vibronic transitions in MgTBP, whose dominant SORET band coincides exactly with the strongest DIB at 4428 A. The identification of porphyrins in the interstellar medium has obvious implications for the origin of life.
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