Reactions of [FORMULA][F][RM]C[/RM][SUP]-[/SUP][INF]n[/INF][/F][/FORMULA] and [FORMULA][F][RM]C[/RM][INF]n[/INF][RM]H[/RM][SUP]-[/SUP][/F][/FORMULA] with Atomic and Molecular Hydrogen

Barckholtz, Cynthia; Snow, Theodore P.; Bierbaum, Veronica M.

doi:10.1086/318909

Cited by 81 publications

(54 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

893

880

View full text Add to dashboard Cite

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.

show abstract

Section: Appendix A: Rate12 Referencesmentioning

confidence: 99%

The UMIST database for astrochemistry 2012

McElroy

Walsh

Markwick

et al. 2013

A&A

893

880

View full text Add to dashboard Cite

show abstract

“…for which we have used the rate coefficients of 8.3 × 10 −10 and 5.0 × 10 −10 cm 3 s −1 , for n = 4 and n = 6, respectively, as measured by Barckholtz et al (2001). Reactions with other neutral species and with cations, although included in the reaction set, are less significant, owing to the lower fractional abundances of these reactants.…”

Section: The Modelmentioning

confidence: 99%

The fractional ionization in dark molecular clouds

Flower¹,

Forêts

Walmsley

2007

A&A

View full text Add to dashboard Cite

Aims. We have studied the mechanisms which govern the degree of ionization of the gas in molecular clouds and prestellar cores, with a view to interpreting the relative abundances of the carbon-chain species C n H and their negative ions, C n H − . Methods. We followed the chemical evolution of a medium comprising gas and dust as it evolves towards its steady-state composition. Various assumptions were made concerning the grain size-distribution and the fraction of very small grains (in practice, PAH), as well as the cosmic ray ionization rate. Particular attention was paid to reactions which determine the fractional ionization of the gas and the charge of the grains. Results. We found that the abundance ratio n(C 6 H − )/n(C 6 H) is determined essentially by the ratio of the free electron density to the density of atomic hydrogen. A model with a high fractional abundance of PAH and a low fractional abundance of electrons yields agreement to a factor of 2 with the value of the ratio C 6 H − :C 6 H observed recently in TMC-1. However, the fractional abundances of the molecular ions HCO + and DCO + are then higher than observed. The best overall fit with the observations of TMC-1 is obtained when the cosmic ray ionization rate is reduced, together with the rate of removal of atomic hydrogen from the gas phase (owing to adsorption on to grains).

show abstract

“…An anion with a specific mass-tocharge ratio is selected with the SIFT quadrupole, and injected into the reaction flow tube for study. None of the carbon chain anions react with molecular hydrogen, but they react efficiently with hydrogen atoms by associative detachment; the larger carbanions also show simple addition to form the hydrogenated carbon chain anions (Barckholtz et al 2001).…”

Section: Methodsmentioning

confidence: 99%

Laboratory Studies of Ion Chemistry in the Interstellar Medium

Bierbaum

2013

Proc. IAU

View full text Add to dashboard Cite

Abstract. Studies of gas phase ion-neutral reactions provide insight into many areas of astrochemistry, including the elusive characterization of the Diffuse Interstellar Bands (DIBs). This presentation gives an overview of our experimental studies of several classes of positive and negative ions, using the flowing afterglow-selected ion flow tube and a newly modified ion trap. Earlier studies of carbon chain anions and polycyclic aromatic hydrocarbon (PAH) cations, both of which have been suggested as carriers of the DIBs, are described. More recent work including isomeric PAHs, nitrogen-containing PAHs, negative ions of PAHs, and negative ions of 5-membered heterocyclic rings are discussed. Finally, the study of quantitative thermochemistry by coupling our results with data from Photoelectron Spectroscopy is described.

show abstract

Reactions of [FORMULA][F][RM]C[/RM][SUP]-[/SUP][INF]n[/INF][/F][/FORMULA] and [FORMULA][F][RM]C[/RM][INF]n[/INF][RM]H[/RM][SUP]-[/SUP][/F][/FORMULA] with Atomic and Molecular Hydrogen

Abstract: Gas-phase reaction rate constants have been measured for the reactions of ( , 4-10) and C n H Ϫ Ϫ

Cited by 81 publications

References 36 publications

The UMIST database for astrochemistry 2012

The UMIST database for astrochemistry 2012

The fractional ionization in dark molecular clouds

Laboratory Studies of Ion Chemistry in the Interstellar Medium

Contact Info

Product

Resources

About