Spectroscopic Identification of the Primary Products of Metastable Diacetylene Photochemistry.

Details Spectroscopic Identification of the Primary Products of Metastable Diacetylene Photochemistry. Spectroscopic Identification of the Primary Products of Metastable Diacetylene Photochemistry.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.3314r&link_type=abstract

American Astronomical Society, DPS meeting #29, #33.14; Bulletin of the American Astronomical Society, Vol. 29, p.1039

Astronomy and Astrophysics

Astronomy

Scientific paper

The ultraviolet photochemical reactions of diacetylene are thought to provide some of the precursor material for the visible absorbing haze which envelops Titan. Our group has studied the ultraviolet photo- chemistry of metastable diacetylene (C4H2(*) ) with a series of hydrocarbons important to the atmosphere of Titan. The aim of these experiments was to determine the primary reaction products. Initially these primary products were identified only by mass spectroscopy. The addition of a tunable light source to our experimental setup has allowed the spectroscopic identification of the primary products of these reactions via resonant two photon ionization (R2PI) and ionization potential measurements. In this poster we present spectra which unambiguously identify these primary products. One of the most interesting results is the identification of benzene and phenylacetylene as the primary products of the butadiene plus C_4H_2(*) reaction. The primary products of the self reaction C_4H_2 + C_4H_2(*) and propene + C_4H_2(*) , are C_6H_2 and C_6H_4, respectively. These hydrocarbons have been identified as triacetylene and hex-1-ene-3,5-diyne by R2PI spectroscopy. Ionization potentials of C_6H_2 and C_8H_2, the primary products of the C_4H_2 + C_4H_2(*) reaction, have been measured and agree with literature values for triacetylene and tetraacetylene. These product structures are consistent with earlier mechanistic predictions.

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