Absolute state-selected and state-to-state total cross sections for the Ar+(2P3/2,1/2)+CO2 reactions

Abstract

Absolute stateselected and statetostate total cross sections for the Ar+(2 P 3/2,1/2)+CO reactions J. Chem. Phys. 95, 3381 (1991); 10.1063/1.460843Experimental and theoretical total stateselected and statetostate absolute cross sections. II. The Ar+(2 P 3/2,1/2)+H2 reaction J. Chem. Phys. 93, 4832 (1990); 10.1063/1.459671Experimental and theoretical total stateselected and statetostate absolute cross sections. I. The H+ 2(X,v')+Ar reaction Absolute stateselected and statetostate total cross sections for the reaction Ar+(2 P 3/2,1/2)+O2 Absolute statetostate total cross sections for the reactions N+ 2(X,v'=0-2) +Ar(1 S 0)→N2(X,v)+Ar+(2 P 3/2,1/2) Absolute spin-orbit state-selected total cross sections for the reactions, Ar + (2 P3/2.112) + CO 2 -+ CO 2 + + Ar [reaction (1)], CO + + 0 + Ar [reaction (2) ], o + + CO + Ar [reaction (3) ], C++ 20 + Ar [reaction (4)], ArC + + 20 [reaction (5)],ArO + + CO [reaction (6)], and ArCO + + 0 [reaction (7)] have been measured in the center-of-mass collision energy (E c . m . ) range of 0.26-131 e V. The ratio of the charge-transfer cross section due to Ar + e P I12 ) to that associated with Ar + e P3(2 ) varies in the range of 0.5-0.8. The appearance energies observed for CO + (E c . m . = 4.2 ± 0.5 eV), 0 + (E c . m . = 3.7 ± 0.5 eV), and C + (E c . m . = 12.6 ± 0.5 eV) are in agreement with the thermochemical thresholds for reactions (2), (3), and (4), respectively. The comparison of the absolute cross sections for CO + , 0 + , and C + from CO 2 by photoionization and by dissociative charge transfer [reactions (2)-(4)] is made. The kinetic-energy analysis of product cot, CO +,0 +, C +, ArO +, and ArC + suggests that reactions (2)-(7) proceed via a charge-transfer predissociation mechanism. This experiment, together with the previous studies of Ar+ ep3/2.112) + N2 (02'CO), supports the conclusion that product ions formed by dissociative photoionization are also produced by dissociative charge transfer. We find that the absolute cross sections for product ions formed in the dissociative charge-transfer processes [reactions (2 )-( 4)] are substantially greater than those formed in the dissociative photoionization of CO 2 , a finding consistent with the general observation that photo ionization cross sections are significantly smaller than charge-transfer cross sections. The relative cross sections for CO + ,0 + , and C + formed by reactions (2)-( 4) are also found to be different from those for photoionization of CO 2 ' This difference is attributed to the anisotropic interaction potential surface responsible for the Ar + ep3(2,1I2) + CO 2 reactions.162

Ion Momentum Imaging Study of the Ion–Molecule Charge Exchange Reaction of Ar+ + CO2

“…During the E c.m. range of 5–10 eV, the cross section ratio between the spin states Ar + 2 P 1/2 and 2 P 3/2 was about σ 1/2 :σ 3/2 = 0.5:1 (as the ion intensity ratio in the Ar + beam) and then increased gradually to 0.7 in the energy range 10–20 eV . Since the Ar + 2 P 3/2 contribution to the CO 2 + production is predominant, the spectral assignments and analyses in the following sections are made with Ar + 2 P 3/2 .…”

“…The molecular ions formed via the charge exchange reactions with the atomic ions are also involved in the recombination reactions, which is a non-negligible factor to control the electron density in planetary ionospheres. The collision-energy dependences of rate constants and cross sections of the Ar + + CO 2 charge-exchange reaction have been studied. , However, to the best of our knowledge, there is a lack of dynamics information about this reaction because the momentum (kinetic energy and angular) distributions of the state-resolved CO 2 + products are still unavailable.…”

CO2dissociation using the Versatile atmospheric dielectric barrier discharge experiment (VADER)

“…The relevant electron-CO 2 collision reactions and their corresponding cross-sections are tabulated in Lindon [6]. The cross-sections were obtained from Itikawa [12], Anzai et al [27], Seiersen et al [28], McConkey et al [15], Itikawa [29], Peverall et al [30], Sheehan and St Maurice [31], Rosén et al [32], Rapp and Briglia [33], Schulz [34], Zecca et al [35], Rejoub et al [36], Derai et al [37], Flesch and Ng [38], and Flesch et al [39]. A minimum electron density of n e = 10 12 cm −3 was assumed to provide a lower limit on the important reaction rates occurring within the streamer.…”

Ion collision cross sections with transport and reaction coefficients in Ar, Cl2 and N2 and their mixtures for photonic crystal applications

“…This cross section is measured by Liao et al [22] and Flesch and Ng [23]. Reaction (6) leading to the production of N + is observed by Flesch and Ng ( [23] and [24]) while reaction (7) corresponding to production ArN + has been detected by Flesch and Ng [23] and also Tosi et al [25]. Concerning the magnitudes of the inelastic cross sections of reactions (5), (6) and (7), it is worth noting that reaction (5) is a largely dominant process in comparison to reactions (6) and (7).…”