# Workshop on LABORATORY ASTROPHYSICS: Interstellar Gas, Dust and Ice

28-30 September 2016
Tagungstätte Schloss Ringberg, Kreuth
UTC timezone
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# Contribution Invited Talk

Tagungstätte Schloss Ringberg, Kreuth -
AFTERNOON SESSION - GAS PHASE

# Molecular Ions as Tracers of the Cosmic-Ray Ionization Rate

## Speakers

• Dr. Nick INDRIOLO

## Content

Cosmic rays play a vital role in initiating the chemistry that occurs in molecular clouds. The ionization of H and H$_2$ begins a network of ion-molecule reactions responsible for generating many of the diatomic and small polyatomic molecules observed in the interstellar medium. A few such species --- OH$^+$, H$_2$O$^+$, and H$_3^+$ in particular --- are formed and destroyed by rather simple processes, making them powerful probes of the cosmic-ray ionization rate. I will discuss the current status of observations of these molecular ions within our Galaxy, as well as the conclusions that can be drawn from this ever-growing sample.