A 0D C2 excitation model with statistical-weight formation pumping reproduces high-J absorption that standard collisional-radiative balance cannot, pointing to chemical formation as the high-J excitation source.
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Rotational equilibrium of C$_2$ in diffuse interstellar clouds
A 0D C2 excitation model with statistical-weight formation pumping reproduces high-J absorption that standard collisional-radiative balance cannot, pointing to chemical formation as the high-J excitation source.