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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Quantum-State-Selected Integral Cross Sections and Branching Ratios for the Ion-Molecule Reaction of N-2(+)(X-2 Sigma(+)(g): nu(+)=0-2) + C2H4 in the Collision Energy Range of 0.05-10.00 eV
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Quantum-State-Selected Integral Cross Sections and Branching Ratios for the Ion-Molecule Reaction of N-2(+)(X-2 Sigma(+)(g): nu(+)=0-2) + C2H4 in the Collision Energy Range of 0.05-10.00 eV

机译：对于N-2（+）（X-2 Sigma（+）（+）（+）（g）：Nu（+）= 0-2）+ C2H4的离子分子反应的量子 - 态的整体横截面和分支比 能量范围为0.05-10.00 EV

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By implementing a vacuum ultraviolet laser-pulsed field ionization-photoion ion source with a double quadrupole-double octopole ion guide mass filter, we have obtained detailed quantum-vibrational-state-selected integral cross sections a, nu(+) = 0-2, for the ion-molecule reaction of N-2(+)(X-2 Sigma(+)(g): nu(+) = 0-2) + C2H4 in the center-of-mass kinetic energy range of E-cm = 0.05-10.00 eV. Three primary product channels corresponding to the formation of C2H3+, C2H2+, and N2H+ ions are identified with their sigma(nu+) values in the order of sigma(nu+)(C2H3+) sigma(nu+)(C2H2+) sigma(nu+)(N2H+). The minor sigma(nu+)(N2H+) channel is strongly inhibited by E-cm and observed only at E-cm 0.70 eV. The high sigma(nu+)(C2H3+) and sigma(nu+)(C2H2+) values indicate that C2H3+ and C2H2+ product ions are formed by prompt dissociation of internally excited C2H4+ (C2H4+*) intermediates produced via the near-energy-resonance charge-transfer mechanism. The sigma(nu+)(C2H3+) and sigma(nu+)(C2H2+) are found to drop only mildly or stay nearly constant as a function of E-cm in the range of 0.05-6.00 eV. This observation is contrary to the expectation of a steep decline for the sigma(nu+) value commonly observed for an exothermic reaction pathway as E-cm is increased. Significant vibrational enhancement is observed for the sigma(nu+)(C2H3+) and sigma(nu+)(C2H2+) at nu(+) = 2 and in the E-cm range of similar to 0.20-7.00 eV. The branching ratios sigma(nu+)(C2H3+):sigma(nu+)(C2H2+):sigma(nu+)(N2H+) are also determined with high precision by measuring the intensities of product C2H3+, C2H2+, and N2H+ ions simultaneously at fixed E-cm values. The sigma(nu+) and branching ratio values reported here are useful contributions to the database needed for realistic modeling of the chemical compositions and evolutions of planetary atmospheres, such as the ionosphere of Titian. The quantum-state-selective results can also serve as experimental benchmarks for theoretical calculation
机译：通过使用具有双高压双八孔离子导向块的真空紫外线激光脉冲场电离 - 光离子源，我们已经获得了详细的量子振动 - 状态选择的整体横截面A，NU（+）= 0-2 ，为的离子 - 分子反应N-2（+）（X-2西格玛（+）（克）：NU（+）= 0-2）+ C2H4在E-的中心的质量动能范围cm = 0.05-10.00 ev。对应于形成C 2 H 3 +，C 2 H 2 +和N 2 H +离子的三种初级产物通道用它们的Sigma（Nu +）（C2H3 +）＆GT的顺序用它们的Sigma（Nu +）值鉴定出来。 Sigma（Nu +）（C2H2 +）＆ Sigma（Nu +）（N2H +）。通过E-cm强烈抑制次要的Sigma（Nu +）（N2H +）通道，并且仅在E-CM＆LT; 0.70 ev。高Σ（Nu +）（C2H3 +）和Sigma（Nu +）（C2H2 +）值表明C2H3 +和C2H2 +产物离子是通过迅速通过近能 - 谐振电荷转移产生的内部激发的C 2 H 4 +（C 2 H 4 + *）中间体来形成机制。发现Sigma（Nu +）（C2H3 +）和Sigma（Nu +）（C2H2 +）仅在0.05-6.00eV的范围内仅降低轻度或几乎保持几乎恒定的函数。这种观察结果与E-CM增加，该观察结果与通常观察到的放热反应途径通常观察到的Sigma（Nu +）值的预期相反。对于Nu（+）= 2的Sigma（Nu +）（C 2 H 3 +）和Sigma（Nu +）（C2H2 +）以及类似于0.20-7.00eV的E-CM范围，观察到显着的振动增强。分支比西格马（NU +）（C2H3 +）：西格玛（NU +）（C2H2 +）：西格玛（NU +）（N2H +）也以高精度通过在固定的同时测量产物C2H3 +，C2H2 +，和N2H +离子的强度确定E- cm值。这里报道的Sigma（Nu +）和分支比值是对实际建模所需的数据库的有用贡献和行星大气的演变，例如帝王电离层。量子选择性结果也可以作为理论计算的实验基准

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