分子氢

• Mid-infrared molecular hydrogen (H2) emission is a powerful cooling agent in galaxy mergers and in radio galaxies; （ rotational transition）[1]

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