Table 8.

Frequency of the Al–F bond vibration in the PES local minima (v, cm⁻¹); the activation barriers ($\mathrm{\Delta }{E}_a$, kcal mol⁻¹) and life times of ${\text{AlF}}_6^{3-}$ and ${\text{AlF}}_5^{2-}$ (${\tau }_L$, ps)^#.

Cation	(i) ${\text{AlF}}_6^{3-}\rightleftarrows {\text{AlF}}_5^{2-}+{\text{F}}^{-}$			(ii) ${\text{AlF}}_5^{2-}\rightleftarrows {\text{AlF}}_4^{-}+{\text{F}}^{-}$
	v	$\mathrm{\Delta }{E}_a$	${\tau }_L$	v	$\mathrm{\Delta }{E}_a$	${\tau }_L$
Li+ Figs. 5a, 6a	425 (158)	2.96 (5.78)	0.01(→) 0.1)	205 (115)	2.42 (15.55)	0.013–0.016(→) 5–20 (←)
Na+[18]	236 (122)	6.76 (2.87)	0.06–0.08(→) 0.03 (←)	483 (110)	3.35 (12.36)	0.01 (→) 1.1–2.1(←)
K+ Figs. 5b, 6b	187 (124)	7.78 (0.98)	0.12–0.2(→) 0.012–0.013(←)	504 (102)	5.79 (9.06)	0.02–0.03(→) 0.4–0.7(←)

^#Calculated data characterizing the reverse model processes (i) and (ii) are given in parentheses; arrows indicate direct and reverse processes.