Collisional quenching of N2(A 3? + u ; v= 0, 1) by N atoms, ground state N2 and a pyrex surface

Abstract

The rate constants for the collisional quenching of lumped u = 0 and u = 1 states of N2(A3C:) by ground state N atoms and by N2 molecules, and the probability of deactivation on a Pyrex surface have been measured in a virtually static system at 300 K and at a pressure between 1 and 6 Torr using gas titration, mass spectrometry, isothermal calorimetry and photoionization. The values of the three constants found were respectively (3.5If: 1.7) x lo-'' cm3 atom-' s-l, (4.5+ 1.2) x lo-" cm3 molecule-' s-l and (1.8 & 1.2) x

Gas‐phase ion‐atom reactions

“…Generally, vibrationally excited N, molecules are relaxed by collisions. Only the A 'S: long-lived state can be detected in the discharge, but since the ground-state N atoms very efficiently quench this state (39) (k=3.10-" cm3 atom-' s-*), it is not detected downstream from the microwave discharge (39). Besides the N, contaminant in the downstream flux of the discharge, low-lying metastable excited N atoms may be produced.…”

“…Reactions (55a) and (55b) are about seven times slower than those with 0 atoms [reaction (39)]. The measured rate coefficient is k,, = 0.67 X cm3 s-' (71), where the dominant channel is (55b).…”

Vibrational Kinetics of NO and N2 in the Earth's Middle Atmosphere During GLE69 on January 20, 2005

“…Experimental data by Levron and Phelps (1978) and Vidaud et al. (1976) are also presented in Figure 1.…”

“…The transitions A 3 Σ u + ,v = 0-5 →X 1 Σ g + ,v′ = v + 25 and the calculated rate coefficients k 16 (v = 1-5) at room temperature are shown in Figure 1. Experimental data by Levron and Phelps (1978) and Vidaud et al (1976) are also presented in Figure 1.…”

“…Right panel: The calculated rate coefficients k 16 ( v = 1–5) (circles) are compared with experimental data by Levron and Phelps (1978) (triangles) and by Vidaud et al. (1976) (squares).…”