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• W4386561502 abstract "Abstract A hybrid quartic force field approach produces the same accuracies as non‐hybrid methods but for less than one quarter of the computational time. This method utilizes explicitly correlated coupled cluster theory at the singles and doubles level inclusive of perturbative triples (CCSD(T)‐F12b) in conjunction with a triple‐ basis set, core electron correlation, and scalar relativity for the harmonic terms and CCSD(T)‐F12b with a valence double‐ basis set for the cubic and quartic terms. There is no sacrifice in the prediction of fundamental anharmonic vibrational frequencies or vibrationally‐averaged rotational constants as compared to experiment, but the time saved is notable. Other hybrid methods are examined involving different sizes of basis sets and composite terms included or excluded. Not one is more accurate; only one is faster. F12 (also called F12c) is tested as well, but it has an increase in computational time for no increase in accuracy. As such, this work reports a hybrid and composite approach (F12‐TcCR+DZ) in the computation of rovibrational spectral data which can be applied to the observation of novel molecules in the gas phase in the laboratory and potentially even in astrophysical environments." @default.
• W4386561502 created "2023-09-09" @default.
• W4386561502 creator A5017249945 @default.
• W4386561502 creator A5038349723 @default.
• W4386561502 creator A5091168232 @default.
• W4386561502 date "2023-09-08" @default.
• W4386561502 modified "2023-10-18" @default.
• W4386561502 title "The performance of hybrid and F12∗$$ {}^{ast } $$/F12c explicitly correlated coupled cluster methods for use in anharmonic vibrational frequency computations" @default.
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