Absolute Photodetachment Cross-Section Measurements for Hydrocarbon Chain Anions

Best, Thorsten; Otto, R.; Trippel, Sebastian; Hlavenka, P.; Zastrow, A.; Eisenbach, S.; Jezouin, Sébastien; Wester, Roland; Vigren, Erik; Hamberg, Mathias; Geppert, Wolf D.

doi:10.1088/0004-637x/742/2/63

Cited by 55 publications

(78 citation statements)

References 40 publications

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“…Although there is no experimental data on the REA process for carbon chain molecules, using a similar theoretical approach, we determine in this study cross sections for the inverse process to REA, namely photodetachment (PD), and compare with available data from recent photodetachment experiments [19,20]. This allows us to verify the validity of our results.…”

Section: Introductionmentioning

confidence: 72%

“…(9) and compares them with the available experimental data, which were estimated in Ref. [20] to have about 25 % of uncertainty. The agreement is very good for C 2 H − , especially for experimental data points near the photodetachment threshold.…”

Section: Comparison With the Results Of Photodetachment Experimentsmentioning

confidence: 98%

“…However, the calculated transition dipole moments can be used to determine the photodetachment cross sections, for which experimental data on absolute values of photodetachment cross sections have recently been obtained for CN − [19], C 2 H − [20] and C 4 H − [20] anions. Here, we discuss the interpretation of the photodetachment experiments only briefly.…”

Section: Comparison With the Results Of Photodetachment Experimentsmentioning

confidence: 99%

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Theoretical study of radiative electron attachment to CN, C2H, and C4H radicals

Douguet

Santos

Raoult

et al. 2015

The Journal of Chemical Physics

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A first-principle theoretical approach to study the process of radiative electron attachment is developed and applied to the negative molecular ions CN − , C4H − , and C2H − . Among these anions, the first two have already been observed in the interstellar space. Cross sections and rate coefficients for formation of these ions by radiative electron attachment to the corresponding neutral radicals are calculated. For completeness of the theoretical approach, two pathways for the process have been considered: (i) A direct pathway, in which the electron in collision with the molecule spontaneously emits a photon and forms a negative ion in one of the lowest vibrational levels, and (ii) an indirect, or two-step pathway, in which the electron is initially captured through non-BornOppenheimer coupling into a vibrationally resonant excited state of the anion, which then stabilizes by radiative decay. We develop a general model to describe the second pathway and show that its contribution to the formation of cosmic anions is small in comparison to the direct mechanism. The obtained rate coefficients at 30 K are 7 × 10 −16 cm 3 /s for CN − , 7 × 10 −17 cm 3 /s for C2H − , and 2 × 10 −16 cm 3 /s for C4H − . These rates weakly depend on temperature between 10K and 100 K. The validity of our calculations is verified by comparing the present theoretical results with data from recent photodetachment experiments.

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Section: Introductionmentioning

confidence: 72%

Section: Comparison With the Results Of Photodetachment Experimentsmentioning

confidence: 98%

Section: Comparison With the Results Of Photodetachment Experimentsmentioning

confidence: 99%

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Theoretical study of radiative electron attachment to CN, C2H, and C4H radicals

Douguet

Santos

Raoult

et al. 2015

The Journal of Chemical Physics

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“…2 (top right panel). The main source of polyynes at these radii is from photodetachment of their respective anions (as studied in the laboratory by Best et al 2011),…”

Section: Impact Of Anions On the Cse Chemistrymentioning

confidence: 99%

“…Original measurements, calculations and estimates are taken from the following sources: Adams & Smith (1977), Adams et al (1980), Adams et al (1984), Adusei & Fontijn (1994), Allen & Robinson (1977), Andreazza et al (1995), Andreazza & Singh (1997), Anicich et al (2003b), Anicich et al (2003a), Anicich et al (1977), Anicich et al (1984), Anicich et al (1990), Anicich (1993), Barckholtz et al (2001), Barlow (1984), Barlow & Dunn (1987), Baulch (2005), Baulch et al (1992), Berteloite et al (2010), Berteloite et al (2010), Best et al (2011, Black (1975), Blake et al (1986), Bocherel et al (1996), Bohme et al (1982), Brown & Bolina (2007). Bruhns et al (2010), Brunetti & Liuti (1975) Harada & Herbst (2008), Harrison et al (1986), Hasegawa & Herbst (1993), Hawley et al (1990), Hemsworth et al (1974), Herbst (1983), Herbst et al (1984), Herbst & Leung (1986), Herbst et al (1989a), Herbst & Leung (1989), Herbst et al (1989b), Herbst et al (1989c), Herbst & ...…”

Section: Appendix A: Rate12 Referencesmentioning

confidence: 99%

The UMIST database for astrochemistry 2012

McElroy

Walsh

Markwick

et al. 2013

A&A

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880

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We present the fifth release of the UMIST Database for Astrochemistry (UDfA). The new reaction network contains 6173 gas-phase reactions, involving 467 species, 47 of which are new to this release. We have updated rate coefficients across all reaction types. We have included 1171 new anion reactions and updated and reviewed all photorates. In addition to the usual reaction network, we also now include, for download, state-specific deuterated rate coefficients, deuterium exchange reactions and a list of surface binding energies for many neutral species. Where possible, we have referenced the original source of all new and existing data. We have tested the main reaction network using a dark cloud model and a carbon-rich circumstellar envelope model. We present and briefly discuss the results of these models.

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