J

where I is the moment of inertia and J the angular momentum. The quantum-mechanical analog of (5.5) is

Here J is now the dimensionless rotational quantum number, which can be 0, 1, 2, etc. The quantity B in the second form of equation (5.6) is known as the rotational constant and has the units of frequency.

Table 5.1 Some Useful Molecules molecule abundance" transition type A T06 Aul n°rit comments

Table 5.1 Some Useful Molecules molecule abundance" transition type A T06 Aul n°rit comments

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