Dissociative Recombination of Protonated Formic Acid: Implications for Molecular Cloud and Cometary Chemistry

Vigren, Erik; Hamberg, Mathias; Zhaunerchyk, Vitali; Kamińska, Magdalena; Semaniak, J.; Larsson, Mats; Thomas, Richard; Ugglas, M. af; Kashperka, Iryna; Millar, T. J.; Walsh, Catherine; Roberts, H.; Geppert, Wolf D.

doi:10.1088/0004-637x/709/2/1429

Cited by 20 publications

(20 citation statements)

References 37 publications

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“…The experimental approach and the data analysis procedure to determine the absolute cross section, thermal rate coefficient, and branching fractions were essentially similar to other recent DR investigations at CRYRING (see, e.g., Vigren et al 2010). We will therefore, in this section, only mention details relevant to the present experiment.…”

Section: Experiments and Data Analysismentioning

confidence: 56%

REASSESSMENT OF THE DISSOCIATIVE RECOMBINATION OF N₂H⁺AT CRYRING

Vigren

Zhaunerchyk

Hamberg

et al. 2012

ApJ

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The dissociative recombination (DR) of N 2 H + has been reinvestigated at the heavy ion storage ring CRYRING at the Manne Siegbahn Laboratory in Stockholm, Sweden. Thermal rate coefficients for electron temperatures between 10 and 1000 K have been deduced. We show that electron recombination is expected to play an approximately equally important role as CO in the removal of N 2 H + in dark interstellar clouds. We note that a deeper knowledge on the influence of the ions' rotational temperature in the DR of N 2 H + would be helpful to set further constraints on the relative importance of the different destruction mechanisms for N 2 H + in these environments. The branching fractions in the DR of N 2 H + have been reinvestigated at ∼0 eV relative kinetic energy, showing a strong dominance of the N 2 + H production channel (93 +4 −2 %) with the rest leading to NH + N. These results are in good agreement with flowing afterglow experiments and in disagreement with an earlier measurement at CRYRING.

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Section: Experiments and Data Analysismentioning

confidence: 56%

REASSESSMENT OF THE DISSOCIATIVE RECOMBINATION OF N₂H⁺AT CRYRING

Vigren

Zhaunerchyk

Hamberg

et al. 2012

ApJ

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“…Note 7: In the absence of any data, we have assumed that electron recombination of protonated glycolaldehyde produces neutral glycolaldehyde with a typical rate coefficient for this kind of process. To be noted that significant fragmentation of glycolaldehyde can occur as already noted for other organic species (see, for instance, Hamberg et al (2010), Vigren et al (2013) and Geppert & Larsson (2008)). Therefore, the amount of glycolaldehyde produced in the model can be considered an upper limit.…”

mentioning

confidence: 52%

“…For this reason, we have deleted the radiative association of HCO + + H 2 O from our reaction network. The other routes of HCOOH + 2 / CH 3 O + 2 formation have already been proved to be marginal (Vigren et al 2013). In addition, UMIST also reports OH + H 2 CO → HCOOH + H, a reaction which has been widely studied at higher temperatures.…”

Section: Formic Acid (Hcooh)mentioning

confidence: 99%

The Genealogical Tree of Ethanol: Gas-phase Formation of Glycolaldehyde, Acetic Acid, and Formic Acid

Skouteris

Balucani

Ceccarelli

et al. 2018

ApJ

144

168

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Despite the harsh conditions of the interstellar medium, chemistry thrives in it, especially in star forming regions where several interstellar complex organic molecules (iCOMs) have been detected. Yet, how these species are synthesised is a mystery. The majority of current models claim that this happens on interstellar grain surfaces. Nevertheless, evidence is mounting that neutral gas-phase chemistry plays an important role. In this article, we propose a new scheme for the gas-phase synthesis of glycolaldehyde, a species with a prebiotic potential and for which no gas-phase formation route was previously known. In the proposed scheme, the ancestor is ethanol and the glycolaldehyde sister species are acetic acid (another iCOM with unknown gas-phase formation routes) and formic acid. For the reactions of the new scheme with no available data, we have performed electronic structure and kinetics calculations deriving rate coefficients and branching ratios. Furthermore, after a careful review of the chemistry literature, we revised the available chemical networks, adding and correcting several reactions related to glycolaldehyde, acetic acid and formic acid. The new chemical network has been used in an astrochemical model to predict the abundance of glycolaldehyde, acetic acid and formic acid. The predicted abundance of glycolaldehyde depends on the ethanol abundance in the gas phase and is in excellent agreement with the measured one in hot corinos and shock sites. Our new model overpredicts the abundance of acetic acid and formic acid by about a factor of ten, which might imply a yet incomplete reaction network.

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“…These rate coefficients are larger than their previous values and are each the main formation mechanism for their respective products (Vigren et al 2010a;Hamberg et al 2010). Similarly, kida.uva.2011 is missing reactions that synthesise propene efficiently.…”

Section: Model Resultsmentioning

confidence: 81%

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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Dissociative Recombination of Protonated Formic Acid: Implications for Molecular Cloud and Cometary Chemistry

Cited by 20 publications

References 37 publications

REASSESSMENT OF THE DISSOCIATIVE RECOMBINATION OF N₂H⁺AT CRYRING

REASSESSMENT OF THE DISSOCIATIVE RECOMBINATION OF N₂H⁺AT CRYRING

The Genealogical Tree of Ethanol: Gas-phase Formation of Glycolaldehyde, Acetic Acid, and Formic Acid

The UMIST database for astrochemistry 2012

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Dissociative Recombination of Protonated Formic Acid: Implications for Molecular Cloud and Cometary Chemistry

Cited by 20 publications

References 37 publications

REASSESSMENT OF THE DISSOCIATIVE RECOMBINATION OF N2H+AT CRYRING

REASSESSMENT OF THE DISSOCIATIVE RECOMBINATION OF N2H+AT CRYRING

The Genealogical Tree of Ethanol: Gas-phase Formation of Glycolaldehyde, Acetic Acid, and Formic Acid

The UMIST database for astrochemistry 2012

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Product

Resources

About

REASSESSMENT OF THE DISSOCIATIVE RECOMBINATION OF N₂H⁺AT CRYRING

REASSESSMENT OF THE DISSOCIATIVE RECOMBINATION OF N₂H⁺AT CRYRING