Ultraviolet and infrared spectrum of C6H2 revisited and vapor pressure curve in Titan's atmosphere

Shindo, F.; Bénilan, Y.; Guillemin, Jean‐Claude; Chaquin, Patrick; Jolly, A.; Raulin, F.

doi:10.1016/s0032-0633(02)00151-4

Cited by 33 publications

(25 citation statements)

References 37 publications

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“…(14) The emphasis in many studies of the atmospheric chemistry of Titan focuses on the reactions of acetylene (Shindo et al, 2003). However, the quantum yields for ethylene loss (3.2) compared to that of acetylene loss (1.1) obtained in this study also supports our claim that ethylene photolysis is an important source of higher molecular weight hydrocarbons.…”

Section: Methodssupporting

confidence: 80%

Photochemical processes on Titan: Irradiation of mixtures of gases that simulate Titan's atmosphere

Tran¹,

Joseph²,

Force³

et al. 2005

Icarus

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Section: Methodssupporting

confidence: 80%

Photochemical processes on Titan: Irradiation of mixtures of gases that simulate Titan's atmosphere

Tran¹,

Joseph²,

Force³

et al. 2005

Icarus

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“…We suspected intermediate chlorine compound formed in the synthesis of the stannane precursor. Such compounds were already observed as residue in the synthesis of polyynes [17,18]. The purification procedure was performed by warming the sample at temperature around À50°C up to a pressure of 0.1 mbar in the 2.5 L volume of our apparatus.…”

Section: Methodsmentioning

confidence: 99%

Infrared band intensities of cyanobutadiyne (HC5N) between 400 and 4000cm−1

Bénilan¹,

Jolly²,

Trolez³

et al. 2007

Journal of Molecular Spectroscopy

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“…H(-C≡C-) m H, H(-C≡C) m or (C≡C) m ). Khlifi et al (1995); (i) Shindo et al (2001Shindo et al ( , 2003. Comparing our UV-VIS spectra to spectra obtained by arcing of graphitic electrodes submerged in water (Cataldo 2004), also shown in Fig.…”

Section: Polymerizationmentioning

confidence: 66%

“…The aforementioned reaction products have known vibrational transitions both in the short wavelength range of the C-H stretching mode and around the C-H bending mode. Shindo et al (2001Shindo et al ( , 2003 and A83, page 4 of 11 Zhou et al (2009) have observed other stronger features at 600, ∼620, 664, ∼3330, and 3386 cm −1 . Owing to a combination of the water baseline and worsened signal-to-noise ratios in these parts of the spectrum, these features are not unambiguously identified in our spectra.…”

Section: Polymerizationmentioning

confidence: 98%

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Vacuum ultraviolet photochemistry of solid acetylene: a multispectral approach

Cuylle

Zhao

Strazzulla

et al. 2014

A&A

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Aims. Gas phase acetylene (C 2 H 2 ) and polyynes (H(-C≡C-) m H) are ubiquitous in the interstellar medium. However, astrochemical models systematically underestimate the observed abundances, supporting the idea that enrichment from the solid state takes place. In this laboratory-based study, we investigate the role C 2 H 2 plays in interstellar ice chemistry and we discuss the way its photoproducts may affect gas phase compositions. Methods. C 2 H 2 ice is investigated under vacuum ultraviolet (VUV) irradiation in its pure form as present in the atmosphere of Titan and in a water-dominated ice as present on grain mantles in molecular clouds and on comets. To disentangle the photochemical network, a unique, complementary combination of infrared and ultraviolet-visible (UV-VIS) spectroscopy is used. Results. From the experimental results, it can be concluded that the VUV-induced solid state C 2 H 2 reaction network is dominated by polymerization resulting in the formation of polyynes at least up to C 20 H 2 and larger polyyne-like molecules. At low temperatures, this process takes place very efficiently and suggests low barriers. When extending this reaction scheme to a water-rich environment, the dominant reaction products are CO and CO 2 but the simultaneous detection of polyyne like molecules is evidence that the reactions as observed in pure C 2 H 2 ice persist. Conclusions. From the spectroscopic evidence as presented in this laboratory study, it is concluded that the formation of polyynes upon VUV irradiation of interstellar ices is a process that may contribute to at least part of the observed gas phase enrichment in space.

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Ultraviolet and infrared spectrum of C6H2 revisited and vapor pressure curve in Titan's atmosphere

Cited by 33 publications

References 37 publications

Photochemical processes on Titan: Irradiation of mixtures of gases that simulate Titan's atmosphere

Photochemical processes on Titan: Irradiation of mixtures of gases that simulate Titan's atmosphere

Infrared band intensities of cyanobutadiyne (HC5N) between 400 and 4000cm−1

Vacuum ultraviolet photochemistry of solid acetylene: a multispectral approach

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