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*Mid-infrared molecular hydrogen (H2) emission is a powerful cooling agent in galaxy mergers and in radio galaxies; （ rotational transition）[https://arxiv.org/abs/1805.09926]
:*Table 1. H2 Rotational Transitionsa
:*Notation b Transition c Rest λµm d Eu=k [K] e A [10−7 s−1] f g (J) g
:*S(0) J = 2 - 0 28.219 510 0.00029 5
:*S(1) J = 3 - 1 17.035 1015 0.00476 21
:*S(2) J = 4 - 2 12.279 1682 0.0276 9
:*S(3) J = 5 - 3 9.665 2504 0.0984 33
:*S(4) J = 6 - 4 8.025 3474 0.264 13
:*S(5) J = 7 - 5 6.910 4586 0.588 45
:*S(6) J = 8 - 6 6.109 5829 1.14 17
:*S(7) J = 9 - 7 5.511 7197 2.00 57