Gas‐Phase Electronic Spectra of Carbon‐Chain Radicals Compared with Diffuse Interstellar Band Observations

Motylewski, T.; Linnartz, H.; Vaizert, O.; Maier, John P.; Галазутдинов, Г. А.; Мусаев, Ф. А.; Krełowski, J.; Walker, G. A. H.; Bohlender, D.

doi:10.1086/308465

Cited by 118 publications

(114 citation statements)

References 32 publications

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“…It was argued that the spectrum of a non-polar molecule cooled in a molecular expansion may be considerably colder than in space, where only radiative cooling applies. A similar discussion has been given by (Motylewski et al 2000), who show that unresolved rotational profiles may change substantially for different temperatures, as has also been calculated and discussed by CossartMagos & Leach (1990). 2.…”

Section: Introductionsupporting

confidence: 72%

“…It was shown that the electronic transitions of a series of PAH-cations do not match the listed DIBs (Salama et al 1996(Salama et al , 1999Bréchignac & Pino 1999;Ruiterkamp et al 2002). Similarly, systematic laboratory studies of electronic spectra of carbon chain radicals have not resulted in positive identifications either (Motylewski et al 2000;Ball et al 2000a;Jochnowitz & Maier 2008), even though it is known from combined radioastronomical and Fourier transform microwave (FTMW) studies that many of such species are present in dense clouds (Thaddeus & McCarthy 2001). Only C 3 has been recorded unambiguously in diffuse interstellar clouds (Maier et al 2001).…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

A coincidence between a hydrocarbon plasma absorption spectrum and theλ5450 DIB

Linnartz¹,

Wehres

Winckel

et al. 2010

A&A

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“…2002). Same arguments apply to the C 2n H series (Motylewski et al 2000), the latter with n = 1-4 being well known constituents of dense interstellar clouds with column densities around 10 12 cm −2 . If their column densities are on the order of 10 11 cm −2 in diffuse clouds then, in view of the oscillator strengths of the electronic transitions (0.05 in magnitude), these would result in DIBs with mÅ EW-currently hardly detectable.…”

Section: Introductionmentioning

confidence: 92%

Electronic spectra of carbon chains and rings: Astrophysical relevance?

Jochnowitz

Maier

2008

Proc. IAU

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Abstract. Our research has focused on the measurement of the electronic spectra of unstable molecules which are presumed to be of relevance to astrophysical observations. Among these are the carbon chains and their ions. Thus we have been using and developing a number of spectroscopic methods to determine their spectra in the gas phase, including absorption via cavity ring-down and REMPI methods. The species are produced in supersonic jets coupled with discharge and laser ablation sources. With the successful laboratory detection of the electronic spectra of a number of key species, such as bare carbon chains C n n=4,5, comparisons with astrophysical data could be made which lead to interesting implications for the future search for the species which could be responsible for the diffuse interstellar bands. Among the recent relevant observations in the laboratory have been the electronic spectra of carbon rings, C n n=14,18,22, the development of a method to study transitions in mass-selected ions collisionally relaxed to 20 K and held in a 22-pole radiofrequency trap, and the study of metal containing carbon chains.

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“…The initially evident systems, such as C 6 H and others, have already been studied, albeit with negative results (Motylewski et al 2000). Therefore, we began to search for systems that have been omitted from our laboratory investigations until now.…”

Section: Introductionmentioning

confidence: 99%

VISIBLE ABSORPTIONS OF POTENTIAL DIFFUSE ISM HYDROCARBONS: C₉H₉ AND C₉H₅ RADICALS

Steglich

Maity

Maier

2016

ApJ

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The laboratory detection of previously unobserved resonance-stabilized C 9 H 5 and C 9 H 9 radicals in the supersonic expansion of a hydrocarbon discharge source is reported. The radicals are tentatively assigned as acetylenicsubstituted cyclopentadienyl C 9 H 5 and vinyl-substituted benzyl C 9 H 9 species. They are found to feature visible absorption bands that coincide with a few very weak diffuse interstellar bands toward HD183143 and HD204827.

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Gas‐Phase Electronic Spectra of Carbon‐Chain Radicals Compared with Diffuse Interstellar Band Observations

Cited by 118 publications

References 32 publications

A coincidence between a hydrocarbon plasma absorption spectrum and theλ5450 DIB

A coincidence between a hydrocarbon plasma absorption spectrum and theλ5450 DIB

Electronic spectra of carbon chains and rings: Astrophysical relevance?

VISIBLE ABSORPTIONS OF POTENTIAL DIFFUSE ISM HYDROCARBONS: C₉H₉ AND C₉H₅ RADICALS

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Gas‐Phase Electronic Spectra of Carbon‐Chain Radicals Compared with Diffuse Interstellar Band Observations

Cited by 118 publications

References 32 publications

A coincidence between a hydrocarbon plasma absorption spectrum and theλ5450 DIB

A coincidence between a hydrocarbon plasma absorption spectrum and theλ5450 DIB

Electronic spectra of carbon chains and rings: Astrophysical relevance?

VISIBLE ABSORPTIONS OF POTENTIAL DIFFUSE ISM HYDROCARBONS: C9H9 AND C9H5 RADICALS

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VISIBLE ABSORPTIONS OF POTENTIAL DIFFUSE ISM HYDROCARBONS: C₉H₉ AND C₉H₅ RADICALS