The R-branch of the 1 u 1 g + transition of H 2 shows

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The R-branch of the 1Πu1Σg+ transition of H2 shows a band head at the very low value of J=1. The rotational constant of the ground state is 60.80 cm−1. What is the rotational constant of the upper state? Has the bond length increased or decreased in the transition?

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