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| Paper: |
Evolution of the chemistry in dense clouds |
| Volume: |
12, The Evolution of the Interstellar Medium |
| Page: |
229 |
| Authors: |
Ziurys, Lucy M. |
| Abstract: |
Theoretical consideration with observational support is given to molecule synthesis in dense interstellar clouds emphasizing the gas-phase ion-molecule reactions in cold quiescent clouds. The ion-molecule theory is first compared with species observations of TMC-1 and L134N in which all expected interstellar molecules were detected. The concept of shock chemistry is discussed in the light of observations of the Orion-KL region, and the uniqueness of SiO to shock chemistry is considered. Agreement between theory and observation is evident in measurements of molecules in hot shocked gas, particularly for silicon- and sulfur-related species. The chemistry of the dense clouds is concluded to be an evolving process characterized by gas-phase ion-molecule reactions in nonenergetic phases, and shock-chemistry reactions during the birth and death of stars. |
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