Rotationally Selected and Resolved State-to-State Photoelectron Study of Vanadium Monoxide Cation VO+(X3危鈥? v+ = 0鈥?)
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- 作者：Zhihong Luo ; Yih-Chung Chang ; Huang Huang ; C. Y. Ng
- 刊名：Journal of Physical Chemistry A
- 出版年：2015
- 出版时间：November 12, 2015
- 年：2015
- 卷：119
- 期：45
- 页码：11162-11169
- 全文大小：553K
- ISSN：1520-5215
文摘
Vanadium monoxide cation VO+(X3危鈥?/sup>) has been investigated by two-color visible (VIS)鈥搖ltraviolet (UV) pulsed field ionization鈥損hotoelectron (PFI鈥揚E) methods. The unambiguous rotational assignment of rotationally selected and resolved VIS鈥揢V鈥揚FI鈥揚E spectra thus obtained confirms the ground state term symmetry of VO+ to be X3危鈥?/sup>. The rotational analysis also yields the rotational constants Be+ = 0.5716 卤 0.0012 cm鈥? and 伪e+ = 0.0027 卤 0.0005 cm鈥? for VO+(X3危鈥?/sup>), from which the equilibrium bond distance of VO+(X3危鈥?/sup>) is determined to be re+ = 1.557 卤 0.002 脜. This PFI鈥揚E study covers the vibrational bands, VO+(X3危鈥?/sup>; v+ = 0, 1, 2, and 3) 鈫?VO(X4危鈥?/sup>; v鈥?= 0), which has made possible the determination of the vibrational constants for VO+(X3危鈥?/sup>) to be 蠅e+ = 1068.0 卤 0.7 cm鈥? and 蠅e+xe+ = 5.5 卤 0.7 cm鈥?. The present state-to-state measurement also yields a more precise value (58鈥?80.0 卤 0.7 cm鈥? or 7.238鈥?0 卤 0.000鈥?9 eV) for the ionization energy of VO [IE(VO)]. This value along with the known IE(V) has allowed the determination of the difference between the 0 K bond dissociation energy (D0) of VO+(X3危鈥?/sup>) and that of VO(X4危鈥?/sup>) to be D0(V+鈥揙) 鈥?D0(V鈥揙) = IE(V) 鈥?IE(VO) = 鈭?967 卤 1 cm鈥?.