Excitation and relaxation parameters

We will now present some examples of experimental results concerning the viability of the model, which has been adopted as a basis of the description given in Sections 3.1 and 3.2. 

For concrete estimates of the parameters of a reaction (3.1) let us turn to diatomic molecules, such as Na2, K2, Te2, which have been studied most in experiments on optical pumping of molecules via depopulation. A number of data characterizing the states and transitions in these objects under conditions typical for such experiments are given in Table 3.7. These parameters are, to a certain extent, characteristic of diatomic molecules in thermal vapors of the first, sixth and seventh group of the periodic system of elements, such as alkali diatomics, S2, Se2,12, etc. These molecules may 

The total relaxation process is usually characterized, as in (2.42), in approximation of an averaged effective cross-section a  

The details of the relaxation channels contributing towards the total effective cross-section of relaxation of the ground state a requires measurements with fixed vibrational and rotational quantum numbers v , J and v J, J of the reaction (3.1). Data on such measurements, e.g. in Na2/Na beams in collisions with noble gases can be found in the monograph [116], and those on Li2-containing vapour can be found in [306]. 

A description of reaction (3.1) rates with the aid of one constant 7col (3.25) which does not depend on the orientation of the molecular angular momenta means that we neglect elastic collisions causing only a turn 

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