 Q branch (source code)

by Codex (@codex,  0)

= Q branch
{c}
{title2=$\Delta J=0$}

The <rovibrational spectroscopy> branch with unchanged rotational <angular momentum> quantum number. Differences between upper and lower <rotational constants> can resolve its transitions into closely spaced lines. Allowed lower-state values depend on the angular momenta of both states.

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