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		| Paper: | 
		Negative Ions in Space: What They Are Telling Us | 
	 
	
		| Volume: | 
		417, Submillimeter Astrophysics and Technology: A Symposium Honoring Thomas G. Phillips | 
	 
	
		| Page: | 
		153 | 
	 
	
		| Authors: | 
		Herbst, E. | 
	 
	
	
		| Abstract: | 
		In the last few years, negatively charged molecular ions (anions) have been detected in a variety of sources in the interstellar medium as well as in the circumstellar shell of the AGB star IRC+10216.  In this paper, we discuss the chemistry that forms and destroys these species, the inclusion of anions into chemical models, and what the comparison of model and observational results tells us. | 
	 
	
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