Improved Fits for the Vibrational and Rotational Constants of Many States of Nitrogen and Oxygen

Laher, Russ R.; Gilmore, Forrest R.

doi:10.1063/1.555892

Cited by 134 publications

(71 citation statements)

References 17 publications

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“…However, this simple picture changes drastically in the LIDB emission spectrum of nitrogen excited by the CO 2 laser, the 0-0 band being now very weak. A large number of additional strong bands mainly in the region 3260-3410Å are detected in the LIDB spectrum and can be attributed to emissions from the first negative system of N [40] and Laher and Gilmore [41]. Figure 8 shows the calculated RKR potentials and associated transitions for electronic states of N 2 and N + 2 which can be relevant to interpret the results of the present work.…”

Section: Identification Of the Chemical Species In The Laser-induced mentioning

confidence: 61%

Optical emission studies of nitrogen plasma generated by IR CO₂laser pulses

Camacho

Poyato

Díaz

et al. 2007

J. Phys. B: At. Mol. Opt. Phys.

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Large-scale plasma produced in nitrogen gas at room temperature and pressures ranging from 4 × 10 3 to 1.2 × 10 5 Pa by high-power laserinduced dielectric breakdown (LIDB) has been investigated. Time-integrated optical nitrogen gas spectra excited from a CO 2 laser have been measured and analysed. The spectrum of the generated plasma is dominated by the emission of strong N + and N and very weak N 2+ atomic lines and molecular features of N (B-X) systems are very weak as compared with the chemiluminescence spectrum of nitrogen formed in a glow discharge. An excitation temperature T exc = 21 000 ± 1300 K was calculated by means of the relative intensity of ionized nitrogen atomic lines assuming local thermodynamic equilibrium. Optical breakdown threshold intensities in N 2 at 9.621 µm have been determined. The physical processes leading to the LIDB of nitrogen in the power density range 0.4 < J < 4.5 GW cm −2 have been analysed. From our experimental observations we can suggest that, although the first electrons must appear via multiphoton ionization or natural ionization, electron cascade is the main mechanism responsible for the LIDB in nitrogen.

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Section: Identification Of the Chemical Species In The Laser-induced mentioning

confidence: 61%

Optical emission studies of nitrogen plasma generated by IR CO₂laser pulses

Camacho

Poyato

Díaz

et al. 2007

J. Phys. B: At. Mol. Opt. Phys.

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“…Numerical values for these constants are given in [12,16]. The individual emission peaks are assumed to have the same spectral FWHMs, which are different in the cases of spontaneous and stimulated emission spectra.…”

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confidence: 99%

Optical gain in rotationally excited nitrogen molecular ions

2017

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We pump low-pressure nitrogen gas with ionizing femtosecond laser pulses at 1.5 μm wavelength. The resulting rotationally excited N + 2 molecular ions generate directional, forward-propagating stimulated and isotropic spontaneous emissions at 428 nm wavelength. Through high-resolution spectroscopy of these emissions, we quantify rotational population distributions in the upper and lower emission levels. We show that these distributions are shifted with respect to each other, which has a strong influence on the transient optical gain in this system. Although we find that electronic population inversion exists in our particular experiment, we show that sufficient dissimilarity of rotational distributions in the upper and lower emission levels could, in principle, lead to gain without net electronic population inversion.

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“…7 where an assignment (taken from Refs. [25][26][27]) for the observed rotational transitions in the (4, 1) band is given.…”

Section: Laser Spectroscopic Resultsmentioning

confidence: 99%

Mass spectrometric and laser spectroscopic characterization of a supersonic planar plasma expansion

Witkowicz

Linnartz

Lange

et al. 2004

International Journal of Mass Spectrometry

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A mass spectrometric and laser spectroscopic experiment has been performed to characterize reactive species that are formed in a supersonic planar plasma expansion generated by discharging a high-pressure gas pulse in a multi-layer slit nozzle geometry. Discharges through mixtures of nitrogen, water and acetylene in He have been studied. The mass spectrometric study uses a state-of-the-art time-of-flight setup. Besides (cluster) cations, with sizes as large as (H 2 O) 56 H + , a variety of pure carbon chain anions has been observed. The spectroscopic study uses cavity ring down spectroscopy and shows that a planar plasma is also suited to obtain rotationally resolved spectra of vibrationally excited metastable electronic states.

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Improved Fits for the Vibrational and Rotational Constants of Many States of Nitrogen and Oxygen

Abstract: Determination of vibrational and rotational temperatures in highly constricted nitrogen plasmas by fitting the second positive system of N 2 molecules AIP Advances 5, 057158 (2015);

Cited by 134 publications

References 17 publications

Optical emission studies of nitrogen plasma generated by IR CO₂laser pulses

Optical emission studies of nitrogen plasma generated by IR CO₂laser pulses

Optical gain in rotationally excited nitrogen molecular ions

Mass spectrometric and laser spectroscopic characterization of a supersonic planar plasma expansion

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Improved Fits for the Vibrational and Rotational Constants of Many States of Nitrogen and Oxygen

Abstract: Determination of vibrational and rotational temperatures in highly constricted nitrogen plasmas by fitting the second positive system of N 2 molecules AIP Advances 5, 057158 (2015);

Cited by 134 publications

References 17 publications

Optical emission studies of nitrogen plasma generated by IR CO2laser pulses

Optical emission studies of nitrogen plasma generated by IR CO2laser pulses

Optical gain in rotationally excited nitrogen molecular ions

Mass spectrometric and laser spectroscopic characterization of a supersonic planar plasma expansion

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Product

Resources

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Optical emission studies of nitrogen plasma generated by IR CO₂laser pulses

Optical emission studies of nitrogen plasma generated by IR CO₂laser pulses