The chemistry of complex molecules in interstellar clouds

Details The chemistry of complex molecules in interstellar clouds The chemistry of complex molecules in interstellar clouds

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ijmsi.149..389m&link_type=abstract

International Journal of Mass Spectrometry and Ion Processes, Volume 149/150, pp. 389-402 (1995)

Computer Science

5

Deuterium, Hot Molecular Cores, Interstellar Clouds, Polycyclic Aromatic Hydrocarbons

Scientific paper

This paper is concerned with the chemical evolution of large molecules in interstellar clouds. We consider the chemistry and ionisation balance of large polycyclic hydrocarbon (PAH) type molecules in diffuse clouds and show that certain PAH molecules can be doubly ionised by the interstellar ultraviolet radiation field. If recombination of the dications so produced with electrons is dissociative rather than radiative, then PAHs are rapidly destroyed. PAHs which can only be singly ionised have much smaller recombination energies and can be long lasting in these regions. This type of property may be very important in selecting the PAH species which can populate the general interstellar medium and account for certain of the diffuse bands observed in optical spectra. Destruction of PAH molecules via formation of dications may be responsible for the weakening of the diffuse bands observed in regions of high UV flux. We also discuss the chemistry of large, saturated molecules in hot molecular cores in star-forming regions. Here it appears that gas phase abundances are determined by surface chemistry on he cold ice mantles of interstellar grains. We present the preliminary results of a study of the deuterium chemistry in these hot cores with the aim of probing both the detailed surface processes by which complex molecules are synthesized and the gas phase reactions which destroy them.

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