Journal ArticleDOI
Measured Lifetimes of Rotational and Vibrational Levels of Electronic States of N2
A. Wayne Johnson,R. G. Fowler +1 more
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In this article, the lifetimes of vibrational levels of the B 3πg and C 3πu electronic states of molecular nitrogen and of the positive molecular nitrogen ion were measured by photometrically monitoring the excited level number densities in a pulsed invertron.Abstract:
The lifetimes of vibrational levels of the B 3πg and C 3πu electronic states of molecular nitrogen and of the B 2Σu+ electronic states of the positive molecular nitrogen ion were measured by photometrically monitoring the excited level number densities in a pulsed invertron. Heavy‐particle pressure damping cross sections were obtained from experimental studies of the pressure dependence of the reciprocal lifetimes. Lifetimes of individual rotational levels from K = 14 to K = 35 of the B 2Σu+(υ = 0) levels were measured. The lifetimes of all rotational levels were identical. However, our results suggest a dependence of the line strength on the rotational level different from that predicted by the Born–Oppenheimer approximation with zero rotational–vibrational interaction and zero electron spin–rotational interactions.read more
Citations
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Journal ArticleDOI
Arrays of radiative transition probabilities for the N2 first and second positive, no beta and gamma, N+2 first negative, and O2 Schumann-Runge band systems
TL;DR: Extensive arrays of Einstein A coefficients, band oscillator strengths, sums of the squared electronic-vibrational transition moments, and Franck-Condon factors are presented for the N2 first and second positive, NO beta and gamma, N+2 first negative, and O2 Schumann-Runge band systems.
Book ChapterDOI
Accurate quantum chemical calculations
TL;DR: The full configuration interaction (FCI) wave functions have been applied to a wide range of chemical and physical problems, such as the prediction of energy differences to chemical accuracy as mentioned in this paper, but the computational resources required to achieve such accuracy are very large, and it is not straightforward to demonstrate that an apparently accurate result in terms of agreement with experiment does not result from a cancellation of errors.
Journal ArticleDOI
Spatially resolved diagnostics of an atmospheric pressure direct current helium microplasma
TL;DR: In this article, the authors performed optical emission spectroscopy measurements with added trace probe gases in an atmospheric pressure direct current helium microplasma to investigate the electric field distribution in the cathode sheath region.
Journal ArticleDOI
Determination of gas temperature from unresolved bands in the spectrum from a nitrogen discharge
TL;DR: In this paper, a spectroscopic technique is described for determining the gas temperature associated with unresolved bands in the second positive system of the emission spectrum of molecular nitrogen. But this technique is applied to temporally resolved spectra recorded during the glow stage of spark breakdown in nitrogen.
Journal ArticleDOI
The measurement of lifetimes in atoms, molecules and ions
R E Imhof,F H Read +1 more
TL;DR: In this paper, a review of the current state of the art in the field of direct measurement of atomic and molecular lifetimes is presented, focusing on the more accurate and promising techniques.
References
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Journal ArticleDOI
Potential energy curves for N2, NO, O2 and corresponding ions
TL;DR: In this paper, potential energy curves for the observed electronic states of N2, N2+), NO, NO(+), O2 and O2+ were calculated from published spectroscopic data by a numerical modification of the Rydberg-Klein method.
Journal ArticleDOI
Experimental Determination of the Oscillator Strength of the First Negative Bands of N2
R. G. Bennett,F. W. Dalby +1 more
TL;DR: In this article, the radiative lifetime of the upper state of the 3914 A was measured to be (6.58±0.35) 10-8 sec, corresponding to an oscillator strength f of (3.48± 0.20) 10−2.
Journal ArticleDOI
Franck-Condon factors to high vibrational quantum numbers I. N2 and N+2
TL;DR: Franck-Condon factor arrays have been computed numerically to high vibrational quantum numbers for the band systems N2:C3II−B3II(Second Positive)N2:B3ii−A3∑(First Positive)
Journal ArticleDOI
Franck-Condon factors for electronic band systems of molecular nitrogen
TL;DR: In this paper, the exact vibrational wave functions were obtained by direct numerical solution of the radial Schrodinger equation, and the relative band intensities were compared with experimental data for two of these band systems.
Journal ArticleDOI
Transition Moment of the First Positive Band System of Nitrogen
TL;DR: In this article, the light decay after interruption of a pulsed rf discharge was analyzed in the nitrogen first positive system as a function of nitrogen pressure and wavelength, and values for the natural lifetime of a number of vibronic levels of the B 3IIg state were deduced.
Related Papers (5)
Radiative lifetimes and pressure dependence of the relaxation rates of some vibronic levels in N2+, N2, CO+, and CO
Experimental Determination of the Oscillator Strength of the First Negative Bands of N2
R. G. Bennett,F. W. Dalby +1 more