Influence of the Excited States of Atomic Nitrogen N(2D) and N(2P) on the Transport Properties of Nitrogen. Part I: Atomic Nitrogen Properties

Abstract

In this paper, calculated values of the viscosity and thermal conductivity of atomic nitrogen, taking into account three species (the ground and two excited states), are presented. The calculations, which assume that the temperature dependent probability of occupation of the states is given by the Boltzmann factor, are performed for atmospheric-pressure in the temperature range from 1,000 to 20,000 K. Six collision integrals are used in calculating the transport coefficients and we have introduced new averaged collision integrals where the weight associated at each interacting species pair is the probable collision frequency. The influence of the collision integral values and energy transfer between two different species is studied. These results are compared which those of published theoretical studies.

Transport Coefficients of Ag–SiO2 Plasmas

“…Since a fuse works at high pressure (> 1 atm), we assume that the distribution on the electronic levels of atoms follows a Boltzmann distribution. So, the transport coefficients including the excited states do not differ appreciably from the values calculated only by taking into account the ground states [19,24]. When the potential is defined for each electronic quantum state referenced n, we calculate by numerical integration the collision integrals X ðl;sÞ ij;n ðTÞ versus temperature with the formulation given in Appendix A.…”

Collision Integrals for Interactions Involving Atoms in Electronically Excited States

“…Table 3 presents values of the pure elastic diffusion-type component and of the viscosity-type collision integrals relevant to the first excited dissociation limit for N 2 and N 9 showing a satisfactory agreement with σ 2 Ω c (2,2) * values, both being derived within the traditional multipotential approach.…”

Influence of the Excited States of Atomic Nitrogen N(2D), N(2P) and N(R) on the Transport Properties of Nitrogen. Part II: Nitrogen Plasma Properties

“…In Table 2 the data is taken from one of our previous papers [9,11,12] where the collision integrals are calculated, P and • refer to a polarizability potential (the dipolar polarizability of N 2 is 1.7301 Å 3 [13] leading to V N2p ¼ 12:456 eV Å 4 , same notations as [11]) and to unknown interactions respectively, which are to be determined in this study. Now, the three following interactions are studied: N 2 -N 2 and N-N 2 and e-N 2 .…”