Electronic spectra of linear carbon anions

Tulej, Marek; Kirkwood, David A.; Maccaferri, Gianni; Dopfer, Otto; Maier, John P.

doi:10.1016/s0301-0104(97)00358-3

Cited by 43 publications

(29 citation statements)

References 27 publications

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“…[6][7][8] This problem was considerably reduced by two color photodetachment ͑2CPD͒ spectroscopy, where a tunable laser is employed for the first excitation and a fixed frequency one for the photodetachment step. 4,6,9,10 Absorption spectra were also recorded for massselected anions deposited in 5 K neon matrices, leading to the identification of several electronic transitions based upon theoretical calculations. 11,12 For the odd-numbered carbon anions, C 2nϩ1 Ϫ , nϭ1 -4, theoretical studies predicted linear equilibrium structures, corresponding to ... g 2 u 2 g(u) 4 u(g) 1 2 ⌸ u(g) ground states.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study of the A2Πu–X2Πg band system of C7−

Lakin

Tulej

Maier

et al. 2000

The Journal of Chemical Physics

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The A 2 ⌸ u -X 2 ⌸ g electronic system of gaseous C 7Ϫ is examined experimentally in the light of theoretical predictions. Ab initio calculations at the RHF, RCCSD͑T͒ and MRCI levels using the aug-cc-pVQZ basis set indicate that the transition is accompanied by a small elongation in the molecule and a significant reduction in the spin-orbit coupling constant. On the basis of these predictions the band profiles of the 0 0 0 , 1 0 1 , 2 0 1 and 3 0 1 transitions were recorded using photodetachment spectroscopy. These spectra revealed the spin-orbit component bands for each transition as well as providing band contours which show partially resolved rotational structure. The experimental spectra are compared to simulations based upon the calculated spectroscopic constants and the possible causes of the main features in the band contours are accessed by least-squares fitting of the profiles for the 0 0 0 and 1 0 1 transitions. The implications for the recent observation of coincidences between the A 2 ⌸ u -X 2 ⌸ g vibronic bands of C 7Ϫ and the diffuse interstellar bands are discussed.

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Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study of the A2Πu–X2Πg band system of C7−

Lakin

Tulej

Maier

et al. 2000

The Journal of Chemical Physics

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“…Often, electronic states of anions are above the detachment threshold of the electron. Since the four-wave mixing methods are based on absorption, these states remain accessible for spectroscopic investigations and are, therefore, complementary to LIF or autodetachment [78] techniques.…”

Section: Discussionmentioning

confidence: 99%

Degenerate and two‐color resonant four‐wave mixing of C₂⁻ in a molecular beam environment

Tulej

Knopp

Gerber

et al. 2010

J Raman Spectroscopy

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In this paper, we demonstrate that degenerate and two-color resonant four-wave mixing spectroscopy is applicable for the sensitive and selective characterization of negative ions in a molecular beam environment. Results are shown for C − 2 , which is produced by discharging a mixture of acetylene and argon prior to supersonic expansion. Substantial signal-to-noise ratios of ≈150 show that the method is generally applicable for high-resolution optical double-resonance spectroscopy of negative ions. A detection sensitivity for C − 2 of ≈10 7 ions/cm 3 is estimated.

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“…Tulej et al observed electronic transitions of C 4 -, C 5 -, C 7 -, and C 9 - [20], finding coincidence of the C 7 -lines with some DIB (diffuse interstellar bands) features [21], although this was eventually questioned by new astronomical observations [22]. Zhao et al investigated the spectra and electron-detachment dynamics of C 4 -, C 6 -, and C 8 - [23].…”

Section: Linear Carbon Clustersmentioning

confidence: 99%

“…C 20 fullerene cation, for example, was produced selectively by field evaporation of carbon nanotubes [120]. Moreover, both positive and negative ions of [20]fullerene were formed by debromination of polybrominated dodecahedrane under mass spectrometric conditions, the cage structure being characterized by UPS [23]. Even though controversy remains regarding the structure of C 36 [121], no attempt to produce C 36 from an appropriate organic precursor has been made so far.…”

Section: 6mentioning

confidence: 99%