Energy transfer from argon resonance states to nitrogen, hydrogen, and nitric oxide

Abstract

Transfer of electronic energy from the resonance states Ar(1P1) and Ar(3P1) to diatomic nitrogen, hydrogen, and nitric oxide has been studied with a time-resolved quenching technique. Rate constants for energy transfer were deduced from the changes of the rate of decay of excited states corresponding to known changes of the density of the diatomic molecules. For Ar*–N2 the rate constants were 5.4×10−11 and 0.8×10−11 molecule−1⋅cm3 sec−1 for Ar(1P1) and Ar(3P1), respectively. For Ar*–H2, the measured rate constants were 22×10−11 and 21×10−11 molecule−1 cm3 sec−1 for Ar(1P1) and Ar(3P1), repectively. The results for nitric oxide were 54×210−11 and 32×10−11 molecule−1 cm3 sec−1 for Ar(1P1) and Ar(3P1), respectively.

Spectroscopic diagnostics and modelling of a N2–Ar mixture discharge created by an RF helical coupling device: II. Vibrational distribution of the N2(C3Πu,v′) state

“…The energy transfers from both metastables Ar( 3 P 2 ) and Ar( 3 P 0 ) with energies about 11.72 and 11.55 eV, respectively, with N 2 molecules (reaction (R4)) can efficiently produce N 2 (C 3 u ) molecules in the N 2 -Ar discharge according to the energy considerations and previous works [26,27]. The Ar( 3 P 0 ) metastable state was neglected because its density is about five times lower [28] and the total rate coefficient two-three times lower [29] than that for the Ar( 3 P 2 ) state. The efficiency of this reaction in our system was proved in our previous works [1,3].…”

Gain limits of a Thick GEM in high-purity Ne, Ar and Xe

“…It is clear that the mixtures Ne-N 2 and Ar-N 2 are fundamentally different. For example, there was no evidence in literature for Penning effect in Ar-N 2 indicating the lack of favorable conditions for energy transfer from excitation to ionization while it is known that Ne-N 2 forms a Penning mixture [28] (more details on Penning mixtures can be found in [29][30][31][32]). This point will be further discussed below.…”

Measurement and reduction of Ar metastable densities by nitrogen admixing in electron beam-generated plasmas

“…We should also comment on the quenching by N 2 molecules, as these were admixed to the Ar gas as part of experiments. The rate constants for quenching of Ar 1s levels by N 2 [49,50] are on the order of 10 11 cm 3 s −1 . With the N 2 amount considered in our experiment, the maximum rate would approach 10 4 s −1 .…”

“…This includes changes in the electron beam current and energy as well as the operating background gases. Both the electron density and electron temperature are taken from the Boltzmann code [49] and vary according to operating conditions (see the appendix). Ambipolar diffusion along and across the magnetic field is included to allow for particle loss and electrostatic cooling from the ambipolar electric field [18].…”