Nh2 Q

Here Q is the partition function, and the statistical weight gVjJ is the product of the nuclear spin statistical weight, which, in equilibrium, has values of 1 and 3 for para- and ortho-H2 , respectively, and the rotational statistical weight, which is (2J + 1).

1 The notation of H2 transitions is such that the change in vibrational state is written first (e.g. 1-0) and the rotational change second with the following code: S denotes a change of AJ=-2, Q corresponds to AJ=0, and O to AJ=+2, while the number in parenthesis indicates the final rotational level.

Column densities in the different levels can be derived from the measured intensities Iv,j adopting (see. (1))

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