Abstract
It is shown that there exists a contribution to the transition moment (and hence to the spectral intensity) associated with pure rotational and with vibration-rotational transitions which is proportional to the net charge residing on the molecule and to the difference in masses of the nuclei. Hence, molecule-ions such as HD+ and (Cl35Cl37)+ should absorb and emit dipole radiation with significant intensity in the vibrational and rotational spectral regions.

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