Merged electron-ion beam experiments. III. Temperature dependence of dissociative recombination for atmospheric ions NO⁺, O₂⁺and N₂⁺

Ionic Reactions of Atmospheric Importance.

“…However, at lower temperatures the pulsed afterglow values are somewhat larger than the present value which may be a manifestation of ion clustering in the higher pressure pulsed afterglow experiment (Biondi and ") which is in good agreement with the afterglow results. Data obtained by Mul and McGowan (1979) for CrE(O) using the merged beam technique agree within Theoretical descriptions of dissociative recombination distinguish between a 'direct' process and an 'indirect' process (see the review by Bardsley and Biondi 1970). For the direct process, in which the electron is envisaged to be captured directly into a repulsive state of the neutral molecule, a.…”

Electron energy-dependent product state distributions in the dissociative recombination of O2+

“…3,6,7 In order to interpret and quantify the green and red airglow observations and their ionospheric implications, the dependence of the DR reaction on the O 2 + internal excitation and the electron collision energy must be known. It has already been well established, both theoretically and experimentally, that the temperature dependence of the O 2 + thermal rate coefficient follows the power law ␣͑O 2 + ͒ϳT −0.7 or, in terms of electron-energy dependence of the rate coefficient as used in merged-beam experiments, [8][9][10][11][12] k͑O 2 + ͒ϳE c −0.5 . Here T pertains mainly to the electron temperature, while E c is the collision energy between the electron and the ion.…”

Vibrationally resolved rate coefficients and branching fractions in the dissociative recombination of O2+

“…Kella et al 20 measured the DR branching behavior of an unknown vibrational population of the mixed isotopomer 16 O 18 O ϩ . In Kella et al's study, only the total quantum yields summed over all the vibrational levels are reported.…”

“…In general, the temperature dependence of the thermal rate coefficient is reported to follow ␣(O 2 ϩ )ϳT Ϫ0.7 with T pertaining mainly to the electron temperature. In merged-beam experiments it is the rate coefficient, k, in terms of the electron collision energy which is commonly reported and its dependence is found [13][14][15][16] to be k(O 2 ϩ )ϳE c Ϫ0. 5 .…”

“…These fractions have been determined using ion storage rings, including the results reported here. At the ASTRID ion storage ring, a beam of an unknown vibrational composition of the mixed isotope 16 O 18 O ϩ was used in the studies. 20 In a more recent experiment at the CRYRING ion storage ring, an O 2 ϩ beam was used that consisted of vϭ0 ions only.…”