A new spectrum associated with diatomic carbon

Herzberg, G.; Lagerqvist, A

doi:10.1139/p68-596

Cited by 162 publications

(41 citation statements)

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“…Recently, Herzberg and Lagerqvist [13] discovered a new system of Σ-Σ bands by using a flash discharge in CH4: this is attributed to the 2 Σ u + -2 Σg + transition of C 2 -. The head of the 0-0 band is at 18487 cm -1 (2.3 eV).…”

Section: Electronaffinity Of the C 2 Radicalmentioning

confidence: 99%

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Mass spectrometric determination of the electronaffinities of radicals

Locht

Momigny

1970

Chemical Physics Letters

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By mass spectrometric study of the appearance of C 2 -, CH -and C 2 H -from CH4, C 2 H 2 , C 2 H 4 , C 2 H 3 X (X = Cl, F) the following electronaffinities have been determined: EA(CH) = (2.6 ± 0.3) eV, EA(C 2 ) = (3.3 ± 0.2) eV and EA(C 2 H) = (2.1 ± 0.3) eV. Some evidence is brought to the existence of electronic excited states of these ions. An evaluation of these negative ions dissociation energy in their ground electronic state is given and is found to be of the order of magnitude of the corresponding isoelectronic molecular species dissociation energy.

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Section: Electronaffinity Of the C 2 Radicalmentioning

confidence: 99%

“…It should be desirable that these last points be confirmed by other independent methods such as spectroscopic ones; such measurements are now in progress for the Cp ion [13].…”

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confidence: 96%

Mass spectrometric determination of the electronaffinities of radicals

Locht

Momigny

1970

Chemical Physics Letters

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“…C; was first prepared in matrices by Milligan, Jacox, and Abouaf-Marguin [78, 791 after it was observed in the gas phase by Herzberg and Lagerqvist [80]. It was also studied in emission in matrices by Frosch [81], Bondybey and Nibler [82], and by Allamandola et al, the last named authors presenting a paper at this Conference.…”

Section: Diatomic Hydridesmentioning

confidence: 99%

Matrix‐Isolation Applied to High‐Temperature and Interstellar Molecules: A Review

Weltner

1978

Ber Bunsenges Phys Chem

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Absorptionsspektren, Infrurot 1 Absorptionsspektren, siclitbur und ultruuioleti 1 Elektronenspinresonunz Freie Radikule / MolekiilstrukturThe contributions of optical and electron-spin-resonance (ESR) spectroscopy at 4 K to the determination of the electronic, vibrational, and magnetic properties of high-temperature and interstellar molecules are briefly reviewed. The present status of the ground state properties of the transition-metal oxide, nitride, carbide, and hydride molecules are considered. Other molecules produced by the vaporization of beryllium, carbon, silicon, silicon carbide, boron, and boron carbide are also discussed. Numerous metastable molecules for which spectral data are lacking remain to be detected in interstellar space. It is probable that the role of matrix-isolation, as exemplified by the identification of the interstellar ethynyl and cyanoethynyl radicals via ESR studies at 4 K, will become increasingly important because of thc difliculties in observing many reactive molecules in the gas phase.Die Beitrage der optischen Spektroskopie und der Elektronenspinresonanzspektroskopie (ESR) bei 4 K zur Bestimmung der elektronischen. der magnetischen und der Schwingungseigenschaften von Hochtemperaturmolekiilen und interstellaren Molekilen werden kurz dargestellt. Der gegenwartigc Stand der Kenntnis der Eigenschaften des Grundzustandes von Ubergangsmetalloxid-, -nitrid-, -carbid-und -hydridmolekulen wird beschrieben. Andere Molekiile, die durch Verdampfen von Beryllium, Kohlenstoff, Silizium, Siliziumkarbid, Bor und Borkarbid erzeugt werden, werden ebenfalls diskutiert. Die Entdeckung zahlreicher metastabiler Molekiile im interstellaren Raum, fur die spektrale Daten fehlen, steht noch aus. Es ist wahrscheinlich, daO die Matrixisolierung, wie das Beispiel der Identifizierung von interstellaren Athynyl-und Zyanithynylradikalen mittels ESR-Untersuchungen bei 4 K zeigt, wegen der Schwierigkeiten bei der Beobachtung vieler reaktiver Molekule in der Gasphase zunehmend an Bedeutung gewinnen wird.

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“…The laboratory wavelengths in air for the C 2 _ (0, 0) and (1,1) band were determined from the vacuum wavenumbers given by Herzberg and Lagerqvist (1968) using the relations of Allen (1963) given by Moore, Minnaert, and Houtgast (1966) in the wavelength region ÀA5160-5500 were used to determine the rest wavelengths for HD 201626. It was assumed that there were no wavelength shifts between the Fei lines and the absorption features that were nearly coincident with C 2 _ lines.…”

Section: Wavelength Coincidences In Laboratory and Astronomical Smentioning

confidence: 99%

“…A part of the spectrum, from AA5413.5-5416.5, shown in Figure 1 shows the difficulty created by the blends. This region includes all lines near the C 2 _ (0,0) P branch bandhead at 5415.88 Â, which is the strongest C 2 _ feature on the laboratory spectra of Herzberg and Lagerqvist (1968).…”

Section: Wavelength Coincidences In Laboratory and Astronomical Smentioning

confidence: 99%

A Search for C_{2}^{-} in Spectra of HD 201626 and the Sun

Fay

Johnson²

1972

PASP

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Rotational lines of the (0, 0) and (1, 1) bands of the C2" ion are shown to be coincident with absorption features in the CH star HD 201626 (Cl, 1). Of the 72 lines of the (0, 0) band studied, the coincidences are within 0.04 Â in all but two cases. These two lines are obviously blends, but of unknown origin. All 20 lines of the (1,1) band have coincidences within 0.04 Â. The identification of C>¿~ must still be considered uncertain because the spectrum of HD 201626 is complex and many of the coincident lines are blended. Also the wavelength regions of rotational lines of the (1,0) and (2, 1) lines of C2 _ have not been observed. The C2 _ /C2 ratio might be useful as an electron density probe in these carbon stars. A similar search for coincidences in the solar spectrum gave negative results, which sets an upper limit on the solar ratio C2 -/C2 of ~ 10 -2 .

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A new spectrum associated with diatomic carbon

Cited by 162 publications

References 1 publication

Mass spectrometric determination of the electronaffinities of radicals

Mass spectrometric determination of the electronaffinities of radicals

Matrix‐Isolation Applied to High‐Temperature and Interstellar Molecules: A Review

A Search for C_{2}^{-} in Spectra of HD 201626 and the Sun

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