Wyndham Lewis and G. K. Chesterton

Watson, Sheila

doi:10.5840/chesterton1980627

Cited by 124 publications

(263 citation statements)

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“…The BOB terms Δ i0 in Table 2 are negative and their magnitudes are normal (Watson 1973(Watson , 1980Drouin et al 2001;Müller et al 2005Müller et al , 2007. The BOB terms Δ i1 , however, are rather large, but of similar magnitude.…”

Section: Analysis and Discussionmentioning

confidence: 94%

“…in states with orbital angular momentum Λ > 0, the expansion in J(J + 1) is commonly replaced by an expansion in J(J + 1)−Λ 2 , see e.g. (Watson 1980). Obviously, the two are the same for Σ states with Λ = 0, such as the ground electronic state of CH + .…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…Watson (1973Watson ( , 1980 has shown that several isotopic species of AB can be fit jointly by constraining the Y i j to…”

Section: Analysis and Discussionmentioning

confidence: 99%

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Spectroscopic parameters and rest frequencies of isotopic methylidynium, CH⁺

Müller¹

2010

A&A

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Context. Astronomical observations toward Sagittarius B2(M) as well as other sources with APEX have recently suggested that the rest frequency of the J = 1−0 transitions of 13 CH + is too low by about 80 MHz. Aims. Improved rest frequencies of isotopologs of methylidynium should be derived to support analyses of spectral recording obtained with the ongoing Herschel mission or the upcoming SOFIA. Methods. Laboratory electronic spectra of four isotopologs of CH + have been subjected to one global least-squares fit. Laboratory data for the J = 1−0 ground state rotational transitions of CH + , 13 CH + , and CD + , which became available during the refereeing process, have been included in the fit as well.Results. An accurate set of spectroscopic parameters has been obtained together with equilibrium bond lengths and accurate rest frequencies for six CH + isotopologs: CH + , 13 CH + , 13 CD + , CD + , 14 CH + , and CT + .Conclusions. The present data will be useful for the analyses of Herschel or SOFIA observations of methylidynium isotopic species.

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Section: Analysis and Discussionmentioning

confidence: 94%

Section: Analysis and Discussionmentioning

confidence: 99%

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Spectroscopic parameters and rest frequencies of isotopic methylidynium, CH⁺

Müller¹

2010

A&A

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“…Watson showed that the Dunham parameters Y l,m for different isotopologues can be expressed to a good approximation in terms of the isotopically invariant parameters U l,m , Δ A l,m and Δ B l,m (Watson 1973;Watson 1980):…”

Section: Dunham Fit and Born-oppenheimer Breakdownmentioning

confidence: 99%

Rotational spectra of CF⁺and¹³CF⁺: accurate rest frequencies and spectroscopic parameters

Cazzoli

Cludi

Puzzarini

et al. 2010

A&A

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Context. The astrophysical relevance of the fluoromethylidynium ion and its importance for the interstellar chemistry of fluorine motivated the present laboratory spectroscopic investigation of both 12 CF + and the corresponding 13 C-containing isotopologue, 13 CF + . Aims. This investigation has been carried out to provide accurate rest frequencies for future (radioastronomical) observations, to improve the accuracy of the values for the spectroscopic parameters available in the literature for CF + , and to provide them for the first time for 13 CF + . Methods. Rotational spectra of CF + and 13 CF + were recorded in the millimeter-and submillimeter-wave frequency ranges. Their investigation was supplemented by high-level quantum-chemical computations using state-of-the-art coupled-cluster techniques. Results. We report the most accurate ground-state rotational parameters available so far for CF + and 13 CF + . Conclusions. The ground-state rotational parameters as well as the rest frequencies of 13 CF + will be useful for future observational purposes with the aim of improving the knowledge of fluorine interstellar chemistry.

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“…For two reasons it is very advantageous to use the Dunham expansion method, (i) the number of constants that have to be fitted for obtaining predictions of transition frequencies for different isotopomeric species can be reduced via the introduction of the isotopic invariant parameters U^. Because of the relation (Watson [14], Bunker [15] (3) From the knowledge of the reduced mass, e.g. of a rare isotopomer, the corresponding Dunham coefficient can be determined with the aid of (3).…”

Section: (1)mentioning

confidence: 99%

Pure Rotational Spectra of CS

Ahrens

Winnewisser

1999

Zeitschrift Für Naturforschung A

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The pure rotational spectra of CS and its isotopomers 12 C 33 S, 12 C 34 S, 13 C 32 S, 13 C 33 S, 13 C 34 S including the very rare isotopomer 12 C 36 S were observed. The rotational spectra include ground and vibrationally excited transitions up to v = 16. The new measurements have been performed with the Cologne terahertz spectrometer covering the frequency region from 259 to 1075 GHz. These newly observed rotational transitions together with earlier data were fitted to a Dunhamtype Hamiltonian. The obtained isotopically invariant parameters include vibrational and rotational expansion coefficients.

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Wyndham Lewis and G. K. Chesterton

Cited by 124 publications

References 0 publications

Spectroscopic parameters and rest frequencies of isotopic methylidynium, CH⁺

Spectroscopic parameters and rest frequencies of isotopic methylidynium, CH⁺

Rotational spectra of CF⁺and¹³CF⁺: accurate rest frequencies and spectroscopic parameters

Pure Rotational Spectra of CS

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Wyndham Lewis and G. K. Chesterton

Cited by 124 publications

References 0 publications

Spectroscopic parameters and rest frequencies of isotopic methylidynium, CH+

Spectroscopic parameters and rest frequencies of isotopic methylidynium, CH+

Rotational spectra of CF+and13CF+: accurate rest frequencies and spectroscopic parameters

Pure Rotational Spectra of CS

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Product

Resources

About

Spectroscopic parameters and rest frequencies of isotopic methylidynium, CH⁺

Spectroscopic parameters and rest frequencies of isotopic methylidynium, CH⁺

Rotational spectra of CF⁺and¹³CF⁺: accurate rest frequencies and spectroscopic parameters