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- W2009524772 abstract "Absolute vibrationally selected integral cross sections (σv+'s) for the ion–molecule reaction N(X2Σ; v+ = 0–2) + CH4 have been measured by using the newly developed vacuum ultraviolet (VUV) laser pulsed field ionization-photoion (PFI-PI) double-quadrupole–double-octopole ion guide apparatus. By employing a novel electric field pulsing scheme to the VUV laser PFI-PI source, we have been able to prepare reactant N ions in single-vibrational quantum states with not only high intensity and high purity but also high kinetic energy resolution, allowing integral cross section measurements to be conducted in the center-of-mass kinetic energies (Ecm's) from 0.05 to 10.00 eV. Three primary product channels corresponding to the formations of CH, CH, and N2H+ were identified. After correcting for the secondary reactions involving CH and CH, we have determined the σv+ values of the formation of these primary product ions, σv+(CH), σv+(CH), and σv+(N2H+), and their branching ratios, [σv+(CH): σv+(CH): σv+(N2H+)]/σv+(CH + CH + N2H+), v+ = 0–2, in the Ecm range of 0.05–10.00 eV, where σv+(CH + CH + N2H+) = σv+(CH) + σv+(CH) + σv+(N2H+). The branching ratios are found to be nearly independent of the v+ state and Ecm. Complex v+-state and Ecm dependences for σv+(CH), σv+(CH), and σv+(N2H+) along with vibrational inhibition for the formation of these product ions are observed. The vibrational effects on the σv+ values are sufficiently large to warrant the inclusion of the vibrationally excited reactions N(X2Σ; v+ ⩾ 1) + CH4 for a more realistic modeling of the ion and neutral densities observed in the atmosphere of Titan. The cross-sectional data obtained in the present study are also useful for benchmarking theoretical calculations on ion–neutral collision dynamics." @default.
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- W2009524772 date "2013-05-06" @default.
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- W2009524772 title "ABSOLUTE INTEGRAL CROSS SECTIONS AND PRODUCT BRANCHING RATIOS FOR THE VIBRATIONALLY SELECTED ION-MOLECULE REACTIONS: N$_{2}^{+}$(<i>X</i><sup>2</sup>Σ$_{rm g}^{+}$;<i>v</i><sup>+</sup>= 0-2) + CH<sub>4</sub>" @default.
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- W2009524772 doi "https://doi.org/10.1088/0004-637x/769/1/72" @default.
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