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We show that the DCSD (distinguishable clusters with all singles and doubles)correlation method permits the calculation of vibrational spectra atnear-CCSD(T) quality but at no more than CCSD cost, and with comparativelyinexpensive analytical gradients. For systems dominated by a single referenceconfiguration, even MP2.5 is a viable alternative, at MP3 cost. MP2.5performance for vibrational frequencies is comparable to double hybrids such asDSD-PBEP86-D3BJ, but without resorting to empirical parameters. DCSD is alsoquite suitable for computing zero-point vibrational energies in computationalthermochemistry.

Surprising Performance for Vibrational Frequencies of the Distinguishable Clusters with Singles and Doubles (DCSD) and MP2.5 Approximations