Rotationally resolved electronic spectroscopy of a nonlinear carbon chain radical C6H4+

Khoroshev, Dmitriy; Araki, Mitsunori; Kolek, Przemysław; Birza, Petre; Chirokolava, Andrei; Maier, John P.

doi:10.1016/j.jms.2004.05.019

Cited by 11 publications

(11 citation statements)

References 18 publications

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“…To check whether there are equivalent H-atoms in this carrier, a C 2 H 2 /C 2 D 2 1:1 mixture in He has been used as an expansion gas, but this only results in a very broad absorption feature covering the whole region where results are found for a pure C 2 H 2 and a pure C 2 D 2 expansion. It is impossible to conclude anything about the actual number of equivalent H-atoms in the carrier by determining the number of bands that show up, as could be demonstrated for HC 6 H + or HC 7 H (Sinclair et al 1999;Ball et al 2000a;Khoroshev et al 2004). Also the use of another precursor (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…The gas phase laboratory and observational values of both peak position and bandwidth of the origin band transition should be identical, unless it can be argued that a spectral shift or band profile change may be due to an isotope or temperature effect. An example of the latter is given by spectroscopic measurements on benzene plasma yielding an absorption feature coinciding with the strongest DIB at 442.9 nm (Ball et al, 2000b;Araki et al, 2004). The laboratory FWHM turned out to be narrower than in the astronomical spectrum.…”

Section: Introductionmentioning

confidence: 95%

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A coincidence between a hydrocarbon plasma absorption spectrum and theλ5450 DIB

Linnartz¹,

Wehres

Winckel

et al. 2010

A&A

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Aims. The aim of this work is to link the broad λ5450 diffuse interstellar band (DIB) to a laboratory spectrum recorded through expanding acetylene plasma. Methods. Cavity ring-down direct absorption spectra and astronomical observations of HD 183143 with the HERMES spectrograph on the Mercator Telescope on La Palma and the McKellar spectrograph on the DAO 1.2 m Telescope are compared. Results. In the 543-547 nm region a broad band is measured with a band maximum at 545 nm and FWHM of 1.03(0.1) nm coinciding with a well-known diffuse interstellar band at λ5450 with an FWHM of 0.953 nm. Conclusions. A coincidence is found between the laboratory and the two independent observational studies obtained at higher spectral resolution. This result is important, as a match between a laboratory spectrum and a -potentially lifetime broadened -DIB is found. A series of additional experiments were performed in order to unambiguously identify the laboratory carrier of this band, but this was not successful. The laboratory results, however, restrict the carrier to a molecular transient, consisting of carbon and hydrogen.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

A coincidence between a hydrocarbon plasma absorption spectrum and theλ5450 DIB

Linnartz¹,

Wehres

Winckel

et al. 2010

A&A

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“…Previous studies have employed pulsed molecular beam methods to produce cold polyatomic cations. [12][13][14] While these methods have proven useful in rotationally cooling the created species, spectral congestion is still present due to the fact that many of the vibrational modes are not fully relaxed. In this experiment a desired species can be collisionally relaxed by trapping the ion in a cryogenically cooled He bath.…”

Section: Introductionmentioning

confidence: 99%

Electronic absorption spectra of the protonated polyacetylenes HC2nH2+ (n=3,4) in the gas phase

Dzhonson

Jochnowitz

Kim

et al. 2007

The Journal of Chemical Physics

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A new approach has been developed for the purpose of measuring the electronic transitions to bound exited states for cations that have been collisionally relaxed to low vibrational and rotational temperatures. This has been used to obtain the first gas phase electronic spectra of the protonated polyacetylenes using a two-color ion-photodissociation approach. Specifically, the origin bands in the B (1)A(1)<-- X(1)A(1) transitions of HC(6)H(2) (+) and HC(8)H(2) (+) (C(2v) geometry) were observed at 26,403.3 and 21,399.8 cm(-1). Data on such cooled systems allow a direct comparison between laboratory and astrophysical measurements.

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“…The set-up of the cw cavity ring-down spectrometer has been described in connection with previously studied species HC 6 H þ , C 6 H þ 4 , C 3 H 2 in the 600-800 nm region [8][9][10]. The hydrocarbon molecules are generated in a plasma by applying a high voltage through a gas pulse of acetylene in excess of He or Ar in the throat of a 3 cm Â 200 mm multilayer slit nozzle.…”

Section: Methodsmentioning

confidence: 99%

“…High-resolution experimental techniques such as cavity ring-down (CRD) spectroscopy [6,7] allow the detection of rotationally resolved electronic absorption spectra of hydrocarbon radicals. By using a single-mode cw laser combined with a pulsed slit nozzle discharge, rotationally resolved electronic transitions of linear and nonlinear carbon chains have been measured [8,9]. In this investigation the gas-phase electronic spectrum of a new hydrocarbon cation, CCCCH þ 3 , has been detected and the well resolved rotational structure analyzed.…”

Section: Introductionmentioning

confidence: 99%

Electronic spectrum of the hydrocarbon cation

et al. 2006

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A high-resolution gas-phase electronic spectrum has been detected in the 408 nm region using a cw cavity ring-down spectrometer. The absorption band system is observed using a pulsed slit nozzle discharge with a mixture of acetylene in argon. The rotationally resolved spectrum obtained is that of a symmetric top molecule. The determined constants are ¼ 24491.0500 (108) and B 00 ¼ 0.14165 (44) cm À1 . Consideration of the latter value and ab initio calculations leads to the assignment 3 E X 3 E transition of the linear carbon chain species CCCCH þ 3 in the triplet ground electronic state with C 3v symmetry.

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Rotationally resolved electronic spectroscopy of a nonlinear carbon chain radical C6H4+

Cited by 11 publications

References 18 publications

A coincidence between a hydrocarbon plasma absorption spectrum and theλ5450 DIB

A coincidence between a hydrocarbon plasma absorption spectrum and theλ5450 DIB

Electronic absorption spectra of the protonated polyacetylenes HC2nH2+ (n=3,4) in the gas phase

Electronic spectrum of the hydrocarbon cation

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