High resolution spectra of bands of the first negative group of ionized molecular nitrogen ( 1: B → X)

UV Laser Spectroscopy Using the Velocity-Modulation Technique: New Hot Bands of the B2Σ+u–X2Σ+g System of N+2

“…The rotational analysis was performed by taking advantage of the results obtained in the visible range (13)(14)(15). In particular we have rebuilt all the structure of the ultraviolet bands by using the spectral terms of the electronic ground state calculated with the Dunham coefficients derived by Harada et al (27).…”

“…Finally, by looking at the squared eigenvectors coefficient values (Figs. 3b and 3d) we were able to clearly predict if the presence on the spectrum of the extra -lines could be expected or not, knowing that the Franck-Condon factor of the (14,1) and (20,5) bands of the A 2 ⌸ u -X 2 ⌺ g ϩ transition are negligible. All the unblended extra -lines have been observed as soon the upper level showed a fractional B 2 ⌺ u ϩ character higher than 2% of the squared eigenvector coefficient values.…”

“…Twelve bands, observed in the visible from 380.0 to 475.0 nm (14) and including v B ϭ 0 -6 and v X ϭ 0 -8, were reanalyzed. Deperturbed constants were derived, taking explicitly into account the effects of the perturbation between the vibrational levels of the B 2 ⌺ u ϩ and A 2 ⌸ u (v Ն 10) electronic states, located at 25 461 and 9167 cm Ϫ1 , respectively.…”

Spectroscopic diagnostics of an atmospheric microwave plasma for monitoring metals pollution

“…The molecular rotational temperature was obtained by observations of the first negative system of the N 2 + molecule [9]. This is a very prominent spectrum in pure nitrogen plasmas, but is quickly quenched with the introduction of other gases such as air or oxygen.…”

Laser-Induced Fluorescence from N2+ Ions Generated by a Corona Discharge in Ambient Air

“…With a strong absorption band in the near-ultraviolet, the prevalent nitrogen cation N 2 + is thus of interest as an indicator for the presence of ionizing material. However, although the basic spectroscopy of N 2 + is well known, 4,5 prior measurements have all been made under controlled conditions, and the direct LIF measurement of N 2 + in ambient air has been lacking. For example, LIF via the nitrogen first-negative B 2 Σ + u → X 2 Σ + g transition has been typically measured at pressures of order 1 Torr with the ions generated most commonly in high numbers using electric discharge, 6,7 electron beams, 8,9 and synchrotron radiation.…”