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Abstract:
Previously determined experimental data for thermal attachment of electrons to SF
6
and thermal
detachment from SF
6
−
over the range 590–670 K are reevaluated by a third-law analysis. Recent
high precision calculations of SF
6
−
harmonic frequences and anharmonicities (for several of the
modes) lead to considerable changes in modeled vibrational partition functions which then have
to be accommodated for by a smaller value of the derived adiabatic electron affinity EA of SF
6
.
The previously estimated value of EA
=
1.20 (
±
0.05) eV in this way is reduced to a value of EA
=
1.03 (
±
0.05) eV. In addition, the bond dissociation energy
E
0,dis
for SF
6
−
→
SF
5
−
+
Fisre-
duced to
E
0,dis
=
1.44 (
±
0.05) eV. Finally, the consequences for modeled specific rate constants
k
det
(
E,J
) of electron detachment from SF
6
−
are discussed.
