COLLISION-INDUCED DISSOCIATION AND CHARGE-TRANSFER REACTIONS OF SFX+ (X=1-5) - THERMOCHEMISTRY OF SULFUR FLUORIDE IONS AND NEUTRALS

被引:120
作者
FISHER, ER [1 ]
KICKEL, BL [1 ]
ARMENTROUT, PB [1 ]
机构
[1] UNIV UTAH,DEPT CHEM,SALT LAKE CITY,UT 84112
关键词
D O I
10.1063/1.463840
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Guided ion beam mass spectrometry is used to measure the cross sections for collision-induced dissociation of SF(x)+ (x = 1-5) with Xe. The energy dependences of the cross sections are analyzed to give the following 0 K bond dissociation energies (BDEs): D-degrees-(SF4+-F) = 4.60 +/- 0.10 eV, D-degrees-(SF3+-F) =0.36 +/- 0.05 eV, D-degrees-(SF2+-F) =4.54 +/- 0.08 eV, D-degrees-(SF+-F) =4.17 +/- 0.10 eV, and D-degrees-(S+-F) =3.56 +/- 0.05 eV. The ionization energies, IE(SF) = 10.16 +/- 0.17 eV, IE(SF3)=8.18 +/- 0.07 eV, IE(SF4)=11.69 +/- 0.06 eV, and IE(SF5)=9.60 +/- 0.05 eV, are also measured from analysis of endothermic charge-transfer reactions. From these BDEs and IEs, we derive heats of formation for the sulfur fluoride ions and neutrals that provide a self-consistent set of thermochemical data for the sulfur fluoride species. In some cases, the thermochemical values determined here are considerably different from available literature values. These differences are discussed in detail.
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页码:4859 / 4870
页数:12
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