Observational test of the CH cation oscillator strengths
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TLDR
In this article, the positions and oscillator strengths of the CH + A - X system were estimated by using spectral features in the echelle spectra of 36 stars and assuming that its wavelength and oscillators strength as given in the literature for the (0, 0) transition, i.e. 4232.548 A and 0.00545 respectively, are correct.Abstract:
We revise measurements of the positions and oscillator strengths using spectral features in the CH + A - X system, and by using high-resolution, echelle spectra of 36 stars and assuming that its wavelength and oscillator strength as given in the literature for the (0,0) transition, i.e. 4232.548 A and 0.00545 respectively, are correct. The recommended oscillator strengths of the lines at 3957.689, 3745.308, 3579.024, and 3447.077 A are found to be (in units of 10 -5 ) 342, 172, 75, and 40, respectively. The estimated column densities of the CH cation toward the observed targets are also presented.read more
Citations
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Journal ArticleDOI
Abundances of PAHs in the ISM: confronting observations with experimental results
TL;DR: In this paper, a comparison of laboratory spectra calibrated in intensity with high signal-to-noise observational data in the UV enables us to establish new constraints on PAH abundances.
Journal ArticleDOI
A complete model of CH+ rotational excitation including radiative and chemical pumping processes
Benjamin Godard,José Cernicharo +1 more
TL;DR: In this article, a non-local thermodynamic equilibrium excitation model was developed for the methylidyne cation CH +, which includes the entire energy structure of CH + taking into account the pumping of its vibrational and bound and unbound electronic states by near-infrared and optical photons.
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The relation between column densities of interstellar OH and CH molecules
TL;DR: In this article, a new relation between column densities of OH and CH molecules based on 16 translucent sightlines (six of them new) and confirm the theoretical oscillator strengths of the OH A-X transitions at 3078 and 3082 A (0.003 20, 0.002 10), respectively.
Journal ArticleDOI
The relation between interstellar OH and other simple molecules
TL;DR: In this article, the column densities of interstellar OH and CH molecules were investigated on the basis of 10 new sightlines and it was shown that the OH molecule is not spatially correlated with either CH + or CN simple species.
Journal ArticleDOI
Oh+ in diffuse molecular clouds
TL;DR: In this paper, near ultraviolet observations of OH+ and OH in diffuse molecular clouds reveal a preference for different environments, and the dominant absorption feature in OH+ arises from a main component seen in CH+ (that with the highest CH+/CH column density ratio), while OH follows CN absorption.
References
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Journal ArticleDOI
Note on CH^{+} in Interstellar Space and in the Laboratory.
A. E. Douglas,G. Herzberg +1 more
Journal ArticleDOI
Interstellar C2, CH, and CN in translucent molecular clouds
E. F. van Dishoeck,John H. Black +1 more
TL;DR: In this paper, the A 2Pi-X 2Sigma(+) (1,O) and (2, O) bands of the red system were compared with observations of the violet system for one line of sight.
Journal ArticleDOI
Measurements of CH and CH+ in diffuse interstellar clouds.
TL;DR: A survey of CH and CH/sup +/ absorption was made for directions with known amounts of atomic and molecular hydrogen in this paper, where both radicals are detected only toward directions with substantial amounts of H/sub 2/ (N(H/sub )> or approx. =10/sup 18/ cm/sup -2/).
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Some New Emission Bands of the A1Π - X1Σ+ System of CH+
A Carrington,D A Ramsay +1 more
TL;DR: In this article, eight bands of the A1Π-X1Σ+ system of CH+ have been photographed in emission from a hollow cathode discharge lamp using a high resolution spectrograph.