The spectrum of molecular nitrogen

Lofthus, Alf; Krupenie, Paul H.

doi:10.1063/1.555546

Cited by 1,521 publications

(865 citation statements)

References 314 publications

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“…[33] That affect the excited species N 2 (a′ 1 S u − ) are the radiative transition (Ogawa-Tanaka-Wilkinson-Mulliken band system, a′ 1 S u − −X 1 S g + ) [Lofthus and Krupenie, 1977], the production of two O atoms [Kossyi et al, 1992], the quenching processes with N 2 and O 2 [Umemoto et al, 2003], and the reactions that produce N, O, and N 4 + [Sentman et al, 2008, and references therein]. The radiative lifetime of a′ 1 S u − −X 1 S g + is 0.5 s, since its Einstein coefficient is 2 s −1 .…”

Section: Discussionmentioning

confidence: 99%

The 762 nm emissions of sprites

et al. 2011

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[1] We report the 762 nm emissions in sprites recorded by the ISUAL experiment onboard the FORMOSAT-2 satellite. The 762 nm imager filter is centered at 763.3 nm with a 7 nm bandwidth at 50% transmittance. Sprite emissions in this passband include the N 2 first positive (1PN 2 ) bands, (2, 0) and (3, 1), the O 2 atmospheric (atm) band (0, 0), and the hydroxyl (4, 0) emissions. Because these mixed emissions cannot be resolved in the 762 nm narrowband filter, a zero-dimensional plasma chemistry model is used to estimate the expected relative intensities of these emission bands in sprites. The computed 1PN 2 brightness in a single streamer is 1.4 MR and 2.6 kR for the O 2 atm band emissions at frame integration times of 30 ms. In the 762 nm passband, the 1PN 2 emissions are the dominant emissions in sprites, and the ratio of 1PN 2 to O 2 atmospheric emissions is ∼500, while the hydroxyl emissions can be neglected. In this ISUAL 762 nm campaign, the brightest sprite out of the four recorded events has possible O 2 atm band emissions that lasted more than 90 ms, and its observed brightness is consistent with the model prediction. Even though the lightning 762 nm emissions are strongly absorbed by O 2 below 60 km, the ISUAL observed parent lightning emissions in this passband are still more than a factor of two brighter than those from ISUAL observed sprites. Hence for spacecraft nadir TLE detection missions, 762 nm bands may not be used as the sole signature to identify sprites, and auxiliary emission bands are needed.

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Section: Discussionmentioning

confidence: 99%

The 762 nm emissions of sprites

et al. 2011

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“…Assuming that admixture molecules are in equilibrium with the gas atoms majority, the rotational temperature (T rot ) derived from the ro-vibrational spectra can be considered equal to the gas temperature (T gas ) [28].…”

Section: Rotational Temperature Calculated From Oh (A-x) System and Nmentioning

confidence: 99%

Time resolved optical emission spectroscopy in power modulated atmospheric pressure plasma jet

2014

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Abstract:In this paper, the effects of the power modulation on atmospheric pressure plasma jet, operated in Ar+2%N 2 mixture, are studied. Time resolved optical emission spectroscopy is used for the investigation. From line and band intensities, the excitation, vibration and rotation temperatures are calculated. Their evolution during the modulation period exhibits a strong dependence on modulation frequency. For higher modulation frequencies, there is significant discrepancy in rotational temperatures calculated from OH spectra and from N 2 + spectra, which indicates that thermalisation time can reach milliseconds.

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“…34 In the range vЉϭ0 -9, excellent agreement is found with Zipf and Gorman, 34 In principle, CC calculations should also be used to estimate the contribution of fluorescence to the a 1 ⌸ g state to the radiative lifetime of b(vϭ1), but there is no information available on the magnitudes or phases of the corresponding diabatic electronic transition moments. Therefore, we performed an uncoupled, rotationless ''adiabatic'' calculation of the bϪa (1,vЉ) oscillator strengths, employing RydbergKlein-Rees potential-energy curves for the b and a states, 35 together with an R-dependent electronic transition moment assumed to be the same as that applying to the isoconfigurational C 3 ⌸ u -B 3 ⌸ g transition. 36 The b -a fluorescence is found to be dominated by the ͑1,0͒ transition, with significant contributions only for vЉϽ7.…”

Section: ͑4͒mentioning

confidence: 99%

Lifetime and predissociation yield of N214 b 1Πu(v=1)

Sprengers

Ubachs

Johansson

et al. 2004

The Journal of Chemical Physics

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The lifetime of the b 1 ⌸ u (vϭ1) state in 14 N 2 has been determined experimentally using a laser-based pump-probe scheme and an exceptionally long lifetime of 2.61 ns was found. Semiempirical close-coupling calculations of the radiative lifetime, which include Rydberg-valence interactions in the singlet manifold, are consistent with this large value, giving a value of 3.61 ns and suggesting a predissociation yield of ϳ28% for this level of the b state.

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The spectrum of molecular nitrogen

Cited by 1,521 publications

References 314 publications

The 762 nm emissions of sprites

The 762 nm emissions of sprites

Time resolved optical emission spectroscopy in power modulated atmospheric pressure plasma jet

Lifetime and predissociation yield of N214 b 1Πu(v=1)

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