Nascent rovibrational distribution of NO+(A 1Π) produced from charge-transfer reaction of He2+ with NO at thermal energy

Abstract

Articles you may be interested inRadiative charge transfer in He+ + H2 collisions in the milli-to nano-electron-volt range: A theoretical study within state-to-state and optical potential approaches J. Chem. Phys. 138, 104315 (2013); 10.1063/1.4793986Rovibrationally selected ion-molecule collision study using the molecular beam vacuum ultraviolet laser pulsed field ionization-photoion method: Charge transfer reaction of N2 +(X 2Σg +; v+ = 0-2; N + = 0-9) + ArThe NO ϩ (A 1 ⌸-X 1 ⌺ ϩ ) emission resulting from the He 2 ϩ /NO charge-transfer reaction at thermal energy has been observed in a He flowing afterglow. The vibrational and rotational distributions of NO ϩ (A) were determined from a spectral simulation. The average vibrational and rotational energies deposited into NO ϩ (A) were determined to be 0.22Ϯ0.02 and 0.10Ϯ0.1 eV, respectively. The vibrational population of NO ϩ (A) decreases rapidly for vЈϭ0 -2 and becomes flat for vЈ ϭ3,4, indicating that the vibrational distribution is bimodal. The bimodal vibrational distribution was explained as due to either two different entrance channels or two different dynamics ͑Demkov or Landau-Zener type͒. The rotational distributions were expressed by single Boltzmann temperatures of 1170Ϯ100 K.

The dissociative recombination of NO+: the influence of the vibrational excitation state

“…Given the density of NO in the flow in this experiment, the characteristic time, τ = (k[NO]) −1 , for this reaction to occur is calculated to be 20 µs and so the NO + ions undergoing recombination in this experiment will be predominantly in their ground vibrational state. A similar analysis applies to the experiment where He + 2 and He M were the precursors with the NO + produced initially in its metastable excited state [34,35] from its NO parent, so again one would expect ground state ions due to subsequent quenching.…”

“…This measurement was repeated a number of times and an average value of (3.9 ± 1.0) × 10 −7 cm 3 s −1 was obtained for the recombination rate in good agreement with previous measurements (see, e.g., [8,12,14,17]). An isolated measurement was performed in a pure helium plasma; the main difference in the chemistry is that the He + 2 and metastable helium atoms are destroyed by NO itself [34,35]. This experiment led to a value of α = (3.7 ± 1.0) × 10 −7 cm 3 s −1 .…”

3 Optical studies of ion–molecule reactions

“…Chemiluminescent emissions from elementary ion-diatom charge transfer reactions continue to provide a fruitful avenue for enquiry with recent examples of such studies being measurements of HCl 1 (A 2 S 1 ) emission in the charge transfer reaction of H 1 , 80 C 1 , O 1 , F 1 and Ar 1 , 81 with HCl and CO 1 emissions in the F 1 1 CO charge transfer reaction. 82 The recent studies of Tsuji et al 83 in which NO 1 (A 1 P) emissions were analysed from the reaction:…”