Measurements of rovibronic line oscillator strengths of N₂ in the 83.4 nm region: A high‐resolution high‐temperature study

Abstract

[1] We report the rovibronic line oscillator strengths of N 2 in the 83.4 nm region at high temperatures measured by using ultrahigh-resolution photoabsorption spectroscopy. The measurements have been carried out using a resolution of 6.5 Â 10 À4 nm and at temperatures of 600, 535, and 295 K. The N 2 absorption features in the 83.4 nm region mainly involve the (0,0) band of the c

Cross sections for the O II (83.4 nm) emission from electron impact on O2

“…Though the majority of the 83.4 nm emission from Earth's airglow in the lower ionosphere originates from solar EUV photoionization‐excitation of atomic oxygen, with some from electron impact [ Link et al , 1994], complete analysis of auroral emissions (at lower altitudes) should involve some e − + O 2 contribution [ LeClair and McConkey , 1993; Zipf et al , 1985a]. Modeling of the 83.4 nm emission region is complicated by temperature‐dependent photoabsorption by N 2 and O 2 , which can skew the overlapped O II (83.4 nm) multiplet emissions via the changing ro‐vibrational contributions from N 2 [ Wu et al , 2006]. Also, proton‐stimulated auroral emissions involve a secondary electron component, which is less energetic than from electron‐based auroras and thus have different spectral characteristics [ Galand and Lummerzheim , 2004; Simon et al , 2007].…”