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We evaluate the rovibrational spectrum of the He–HCl van der Waals complex from an accurate ground state intermolecular potential, obtained from CCSD(T) interaction energies. After a systematic basis set study, we select the aug-cc-pV5Z basis set extended with midbond functions. The potential is characterized by two linear minima, i.e., He–ClH and He–HCl, with distances from the He atom to the HCl...
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