Chemical reactions in the interstellar medium

There are many possible chemical reactions that must be considered for all networks of chemical processes, whether within a cold dark cloud, a giant molecular 

Radiative cooling processes for molecules compete with collisions between molecules for removing energy. Collision with another molecule, or in general 

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The variation of reaction rate with temperature follows the Arrhenius equation, which we have used to study the rate of chemical reactions in the interstellar medium ISM (Section 5.4, Equation 5.9), and can be applied to the liquid phase or reactions occurring on surfaces. Even the smallest increases in temperature can have a marked effect on the rate constants, as can be seen in the increased rate of chemical reactions at body temperature over room temperature. Considering a reaction activation energy that is of the order of a bond energy, namely 100 kJ mol-1, the ratio of the rate constants at 310 K and 298 K is given by ... 

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