Electron-impact excitation cross sections into Ne(2p53p) levels for plasma applications

Abstract

One requirement for plasma spectroscopy analysis and modeling of neon discharges is a set of electron-impact excitation cross sections covering excitation from both the 2p6 ground state and from the four 2p53s levels. We present experimental measurements for excitation cross sections into four J = 1 levels of the 2p53p configuration from the J = 0 and J = 2 2p53s metastable levels. A complete set of cross sections into all ten levels of the 2p53p configuration (2px in Paschen’s notation) from the ground state, the two metastable levels and the two resonance levels of the 2p53s configuration (1sy in Paschen’s notation) are compiled in convenient form. The resonance cross sections are obtained from an empirical scaling relationship between the measured metastable excitation cross sections and the corresponding optical oscillator strengths.

Diagnostics of low-temperature neon plasma through a fine-structure resolved collisional–radiative model

“…The depopulation of 2p i levels was assumed through radiative decay to 1s i manifolds. The apparent crosssection measurements [40,43,45] were used for inclusion of the collisional processes in the model of Boffard et al [48,67]. The T e obtained by the emission model at 5 mTorr pressure is ∼10.4 eV, which is significantly higher than the corresponding probe measurement and the present CR model values.…”

“…Later Zatsarinny et al [39] also compared their BSR calculations with them. Jung et al [45] further reported the remaining cross-sections from 1s 5 and 1s 3 to 2p i levels with J=1 (where i=2, 5, 7, and 10) for a limited electron energy range from threshold to ∼16 eV. But again, these cross-sections are apparent cross-sections, and consist of cascades from other higher levels; consequently, these are not being compared here.…”

“…The experimental measurements of cross-sections for limited transitions from different groups are also reported in the literature [40][41][42][43][44][45]. Among these, the most updated and detailed measurements for EIE cross-sections of the Ne atom have been made available by Prof. Lin's group at the University of Wisconsin-Madison, USA.…”

“…The group reported the apparent cross-sections for the EIE from the ground state to 1s, 2p and 3d manifolds [43]. Later, they measured apparent EIE cross-sections from the excited 1s manifold to 2p manifolds [40,45]. It is worth mentioning here that the apparent EIE cross-sections are the sum of the direct cross-section and cascade contribution from the higher lying levels.…”

Practical challenges in the energy‐based control of molecular transformations in chemical reactors

“…In such a case, the electrons are at higher temperature than the ionic and neutral species. The temperatures of ions and neutrals usually take lower values close to that of the ambient environment, that is, from room temperature up to 1000 K, whereas the electrons can feature temperatures above 10,000 K. The energy is transferred between the discharge and the atoms or molecules through electron impact . It is commonly responsible for the well‐known process of dissociation that leads to the breaking of molecular bonds and the generation of chemical products during the chemical reactions.…”