Absorption spectra of conjugated hydrocarbon cation chains in neon matrices

Freivogel, Patrick; Fulara, Jan; Lessen, D.; Forney, Daniel; Maier, John P.

doi:10.1016/0301-0104(94)00243-6

Cited by 90 publications

(94 citation statements)

References 23 publications

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“…The origin band of HC 2n+1 H + shifts monotonically by ϳ90 nm toward longer wavelengths as the size of cations increases, as shown earlier. 27 Another pattern observed is that the integrated intensity of the band system normalized to the same ion charge ͑1 C͒ increases from 0.06 through 0.14, 0.32, and 0.37 to 0.86 in the series n =2-6.…”

Section: Resultsmentioning

confidence: 94%

“…Figure 1 shows the lowest energy Ã 2 ⌸ b ← X 2 ⌸ a transition of HC 2n+1 H + , where a ϵ u and b ϵ g for n = even and vice versa for n = odd. This band system has already been reported, 15,27 but is included here for two reasons. First, a higher signal-to-noise ratio was achieved and consequently more detail is seen in the spectra, e.g., vibrationally excited levels of HC 5 H + and HC 7 H + .…”

Section: Resultsmentioning

confidence: 99%

“…The apparatus used in the past 27 for mass-selective deposition of charged species into neon matrixes has been modified. All rubber seals in the matrix chamber were replaced with Cu gaskets and diffusion pumps by turbo ones.…”

Section: Methodsmentioning

confidence: 99%

“…25 and 26͒ there are only two reports on the spectroscopic studies of the lowest energy electronic transition of HC 2n+1 H + ͑n =2-7͒. 15,27 Recently, we explored higher energy electronic transitions of HC 2n H + ͑n =2-7͒ in neon matrices. 28 The results had encouraged us to come back to the spectroscopic studies of HC 2n+1 H + .…”

Section: Introductionmentioning

confidence: 99%

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Higher energy electronic transitions of HC2n+1H+ (n=2–7) and HC2n+1H (n=4–7) in neon matrices

Fulara

Nagy

Garkusha

et al. 2010

The Journal of Chemical Physics

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Electronic absorption spectra of linear HC 2n+1 H + ͑n =2-7͒ were recorded in 6 K neon matrices following their mass-selective deposition. Four new electronic band systems are identified; the strongest Ẽ 2 ⌸ g/u ← X 2 ⌸ u/g lies in the UV and the second most intense C 2 ⌸ g/u ← X 2 ⌸ u/g is located in the visible range. The known Ã 2 ⌸ g/u ← X 2 ⌸ u/g absorption is an order of magnitude weaker than C 2 ⌸ g/u ← X 2 ⌸ u/g . Transitions to the B and D states are also discussed. The wavelengths of the HC 2n+1 H + ͑n =2-7͒ electronic systems obey a linear relation as a function of the size of the cations, similar to other carbon chains. The B 3 ⌺ u − ← X 3 ⌺ g − transition in the UV of neutral HC 2n+1 H ͑n =4-7͒ has also been identified upon photobleaching of the cations trapped in the matrices.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Higher energy electronic transitions of HC2n+1H+ (n=2–7) and HC2n+1H (n=4–7) in neon matrices

Fulara

Nagy

Garkusha

et al. 2010

The Journal of Chemical Physics

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“…This experiment combines mass selection and matrix isolation spectroscopy and has been described. 25 The C 6 H 4 ϩ (C 6 D 4 ϩ ) cations were produced from a phenylacetylene-deuterated-2,4-hexadiyne-͒ helium mixture in a hot cathode discharge source. A 90°deflector and a quadrupole mass spectrometer are used to steer the ion beam onto the matrix, where the mass-selected ions are codeposited with excess of neon at 6 K. The absorption spectra are recorded by guiding monochromatized light ͑0.1 nm bandpass͒ through the matrix onto a photomultiplier.…”

Section: Resultsmentioning

confidence: 99%

High-resolution electronic spectroscopy of a nonlinear carbon chain radical C6H4+

Araki

Linnartz

Cias

et al. 2003

The Journal of Chemical Physics

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A high-resolution gas-phase spectrum of a molecular absorption band around 604 nm is assigned as due to an electronic transition of a nonlinear C 6 H 4 ϩ planar species starting from its 2 AЉ electronic ground state. The spectrum is observed in direct absorption by cavity ringdown spectroscopy through a supersonic planar discharge through a mixture of acetylene in helium. The spectrum has a clear rotational and K-type structure. This allows an accurate determination of the B and C rotational constants and an estimate for the A rotational constant in ground and electronically excited states. The resolved spectrum of the fully deuterated species C 6 D 4 ϩ has been obtained as well. The results are compared both to the outcome of ab initio geometry optimizations and low-resolution absorption spectra in 6 K neon matrices obtained after mass-selective deposition.

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The A1Π(u)←X1Σ Electronic Transition of CCN+ and CNC+

Wyss

Riaplov

Maier

et al. 2001

HCA

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Dedicated by J.P.M. to Edgar Heilbronner on the occasion of his 80th birthday as reminder of all the years together in the Physikalisch-Chemische Anstalt and the common SNF projects.The electronic absorption spectra of the A 1 P (u) 2 X 1 S g transition of CCN and CNC have been observed in a 5 K Ne matrix after mass selection of C 2 N . CCN has the origin band at 462.0(2) nm. The vibrational structure with frequencies 1223 (20) and 1725(20) cm À1 corresponds to the symmetric and antisymmetric stretching modes in the excited state. The origin band of CNC is observed at 325.7(2) nm, and the system shows extensive vibrational excitation. Calculations of the potential energy functions of CCN and CNC in their X 1 S g ground state and the A 1 P state of CCN followed by variational evaluation of the rovibronic energy levels allows the assignment of the observed spectra. These spectroscopic data open the way to gas-phase studies of the astrophysically important C 2 N ions.

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Absorption spectra of conjugated hydrocarbon cation chains in neon matrices

Cited by 90 publications

References 23 publications

Higher energy electronic transitions of HC2n+1H+ (n=2–7) and HC2n+1H (n=4–7) in neon matrices

Higher energy electronic transitions of HC2n+1H+ (n=2–7) and HC2n+1H (n=4–7) in neon matrices

High-resolution electronic spectroscopy of a nonlinear carbon chain radical C6H4+

The A1Π(u)←X1Σ Electronic Transition of CCN+ and CNC+

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