Collisional vibrational quenching of NO+(v) ions

Abstract

Articles you may be interested inEffect of collisional quenching on the measurement of ion species mix in neutral beam injectors Vibrational quenching rate constants have been measured for NO+ (v >0) ions with 15 neutral quenching molecules by the SIFDT -monitor ion technique. The temperature dependence of the quenching rate constants for the reactions ofthe neutrals N 2 , CO 2 , and CH 4 has been investigated from 208 to 450 K. The dependence of the CH 4 quenching rate constant on collision energy has been determined in the energy range 0.03-0.12 eV at 208 and 296 K. Also measured are rate constants for some of the reactions pertinent to the monitor ion technique.

Auroral NO+ 4.3 μm emission observed from the Midcourse Space Experiment: Multiplatform observations of 9 February 1997

“…The photon efficiency for NO + Dv = 1 emission for energetic auroral electrons as calculated by AARC for the two cases considered here, vibrationally excited NO + produced by reaction (1) and by the combined effect of reactions (1) and (2). The effects of collisional deactivation by N 2 are illustrated for both cases based on the SQQ1 quenching model and the temperature dependent quenching rate reported by Morris et al [1988]. The SQQV and the MQQV quenching models are also shown for the case where it is assumed vibrationally excited NO + is produced by the sum of reactions (1) and (2).…”

“…Accounting for the transmittance effects of the radiometer filter, the efficiency for the full NO + Dv = 1 band is estimated as 1.3 to 1.8 photons per ion pair. The auroral efficiency for NO + Dv = 1 emission as measured by the Auroral Dynamics radiometer is compared in Figure 16 with an AARC calculation assuming the vibrational excitation of NO + from reactions (1) and (2), the SQQ1 quenching model, and the Morris et al [1988] rate for collisional deactivation of NO + v ! 1 by N 2 .…”

“…0) by N 2 , given by Morris et al [1988] as 2.4 ± 0.7 Â 10 À12 (300/T) 2.3 cm 3 s À1 , has been used to calculate the efficiency for NO + Dv = 1 auroral emission in the present analysis with three different quenching models designated SSQ1, SQQV, and MQQV. For the SQQ1 case, quenching proceeds in single quantum steps and the Morris et al [1988] rate is used for all vibrational levels, v = 1 -14, relevant to the current analysis. In the SQQV model, quenching is also by single quantum steps but the rate coefficient for vibrational level, v, is directly proportional to v in accord with the Landau-Teller scaling law.…”

“…The MSX results are consistent with the interpretation the NO + Dv = 1 emission is produced by the sum of reactions (1) and (2). The AARC calculations used the SQQ1 quenching model and the temperature dependent quenching rate for N 2 reported by Morris et al [1988]. Figure 15.…”

“…In addition, the collisional deactivation rate reported by Morris et al [1988] for N 2 was used for all the vibrationally excited states of NO + in the SQQ1 process. The AARC MWIR radiance altitude profiles in Figures 11b and 12, predominantly NO + Dv = 1 emission, resemble the measured auroral profile within a factor of two over the altitude range from 100 to 120 km.…”