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Ab initio path integral molecular dynamics simulations of F$$_2$$H$$^-$$ and F$$_2$$H$$_3^+$$

Suzuki, Kimichi*; Ishibashi, Hiroaki*; Yagi, Kiyoshi*; Shiga, Motoyuki  ; Tachikawa, Masanori*

The quantum nature of the strong hydrogen bonds for the F$$_2$$H$$^-$$ and F$$_2$$H$$_3^+$$ ions and their deuterated isotopomers at the room temperature has been studied using ab initio path integral molecular dynamics (PIMD) simulations. It is found that, for both of these ions, the hydrogen-bonded H/D atoms largely fluctuate around the central position of two F atoms. The average FH/FF distances of F$$_2$$H$$^-$$ and F$$_2$$H$$_3^+$$ are longer than the average FD/FF distances of F$$_{2}$$D$$^{-}$$ and F$$_2$$H$$_3^+$$ due to the primary/secondary isotope effects, which stem from the difference of the quantum nature of H and D nuclei. These results are compared with the family of Zundel-type ions, O$$_2$$H$$_3^-$$, N$$_2$$H$$_5^-$$, O$$_2$$H$$_5^+$$, and N$$_2$$H$$_7^+$$, which have been studied previously with the same ab initio PIMD approach. A comparison is also made with the previous experimental and ab initio vibrational configuration interaction results of F$$_2$$H$$^-$$.

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