Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe..63b&link_type=abstract
"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782
Astronomy and Astrophysics
Astrophysics
Laboratory
Scientific paper
Organic molecules were observed toward several molecular clouds. The abundances of these molecules depends on both formation and destruction rates. We present experimentally results of the ionization and dissociation processes of these five molecules. The measurements were taken at the Brazilian Synchrotron Light Laboratory (LNLS), using time of flight mass spectrometry. Mass spectra were recorded at different energies corresponding to the vacuum ultraviolet, (21.21 eV) and soft X-ray (282-301 eV) spectral regions. Kinetic energy distributions and abundances for each ionic fragment have been obtained from the analysis of the corresponding peak shapes in the mass spectra. From the photoionization and photodissociation cross sections here determined we obtained the photodissociation rate and lifetime of all molecules. We show that the different relative abundances of interstellar organic molecules are also due to the differentially photodissociation.
Boechat-Roberty Heloisa M.
Fantuzzi F.
Neves Rui
Pilling Sergio
Santos A. C. F.
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