Reactions of Cn (n=1–3) with ions stored in a temperature-variable radio-frequency trap

Savić, I.; Cermak, I.; Gerlich, D.

doi:10.1016/j.ijms.2004.10.015

Cited by 23 publications

(38 citation statements)

References 29 publications

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“…have been performed by Savić et al (2005) at an estimated translational temperature of ∼ 1, 000 K (see Section 9.2 for a discussion of both the translational and internal temperatures in their work). Throughout this paper, we use the term "translational temperature" to refer to the reaction center-of-mass velocity distribution when it is described by a Maxwell-Boltzmann distribution.…”

Section: Introductionmentioning

confidence: 99%

REACTION STUDIES OF NEUTRAL ATOMIC C WITH ${{\rm{H}}}_{3}^{+}$ USING A MERGED-BEAMS APPARATUS

O'Connor

Urbain

Stützel

et al. 2015

ApJS

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We have investigated the chemistry of C + H + 3 forming CH + , CH + 2 , and CH + 3 . These reactions are believed to be some of the key gas-phase astrochemical processes initiating the formation of organic molecules in molecular clouds. For this work we have constructed a novel merged fast-beams apparatus which overlaps a beam of molecular ions onto a beam of ground-term neutral atoms. Here we describe the apparatus in detail and present cross section data for forming CH + and CH + 2 at relative energies from ≈ 9 meV to ≈ 20 and 3 eV, respectively. Measurements were performed for statistically populated C( 3 P J ) in the ground term reacting with hot H + 3 (at an internal temperature of ∼ 2, 550 K). Using these data we have derived rate coefficients for translational temperatures from ≈ 72 K to ≈ 2.3 ×10 5 and 3.4 ×10 4 K, respectively. For the formation of CH + 3 we are able only to put an upper limit on the rate coefficient. Our results for CH +

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Section: Introductionmentioning

confidence: 99%

REACTION STUDIES OF NEUTRAL ATOMIC C WITH ${{\rm{H}}}_{3}^{+}$ USING A MERGED-BEAMS APPARATUS

O'Connor

Urbain

Stützel

et al. 2015

ApJS

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“…1 These so-called Swings emission bands 2 of C 3 were first reproduced in the laboratory by Herzberg 3 in 1942, although the final assignment of the rovibronic spectra was attributed to Douglas 4 and Gausset et al 5,6 Since then, the C 3 radical has been observed in a wide range of astrophysical sources, 7,8 including circumstellar shells of carbon stars, [9][10][11] interstellar molecular clouds, [12][13][14][15] and comets. 1,10 As the most abundant small pure carbon molecule in the interstellar medium, [16][17][18] C 3 along with its smaller congener C 2 are the central key to the formation of more complex carbon clusters, long-chain cyanopolyynes, carbon dust, and polycyclic aromatic hydrocarbons. 2,19,20 Mebel and Kaiser 21 provided alternative pathways, besides the C( 3 P j ) + C 2 H 2 (X 1 Σ + g ) reaction, 22 through which linear C 3 (  X 1 Σ + g ) would be formed in interstellar environments, i.e., in the reactions CH(X 2 Π Ω ) + C 2 (X 1 Σ + g ) and C( 3 P j ) + C 2 H(X 2 Σ + ), the latter being most relevant in interstellar space.…”

Section: Introductionmentioning

confidence: 99%

Accurate ab initio-based double many-body expansion potential energy surface for the adiabatic ground-state of the C3 radical including combined Jahn-Teller plus pseudo-Jahn-Teller interactions

Rocha

Varandas

2015

The Journal of Chemical Physics

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A fully ab initio-based potential energy surface is first reported for the ground electronic state of the C3 radical using the double many-body expansion (DMBE) method. The DMBE form so obtained mimics the full set of energies calculated at the multireference configuration interaction level of theory with chemical accuracy. To account for the incompleteness of the one- and N-electron bases, the calculated external correlation energies have been scaled prior to the fitting procedure via DMBE-scaled external correlation method. Furthermore, the novel potential energy surface reproduces accurately dissociation energies, diatomic potentials, long-range interactions at all asymptotic channels, and the correct topological behavior at the region of 4 conical intersections with the partner state of the same symmetry near equilateral triangular geometries due to combined Jahn-Teller (E' ⊗ e') plus pseudo-Jahn-Teller [(E'+A1')⊗e'] interactions. Rovibrational calculations have also been performed, unveiling a good match of the vibrational spectrum of C3 for 53 calculated levels. The present DMBE form is, therefore, commended for both spectroscopic and reaction dynamics studies, some also performed in the present work.

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“…40,41 These methods also cannot be used to study reactions with C which, due to its high reactivity, cannot be generated in sufficient quantities in the flows. 40,42,43 Lastly, the measured rate coefficients can vary by orders of magnitude as a function of parent and buffer gas pressures. 44 Thus a systematic study of rate coefficient versus these gas pressures may be necessary to generate reliable measurements.…”

Section: Introductionmentioning

confidence: 99%

A novel merged beams apparatus to study anion-neutral reactions

Bruhns

Kreckel

Miller

et al. 2010

Review of Scientific Instruments

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We have developed a novel laboratory instrument for studying gas phase, anion-neutral chemistry. To the best of our knowledge, this is the first such apparatus which uses fast merged beams to investigate anion-neutral chemical reactions. As proof-of-principle we have detected the associative detachment reaction H−+H→H2+e−. Here we describe the apparatus in detail and discuss related technical and experimental issues.

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Reactions of Cn (n=1–3) with ions stored in a temperature-variable radio-frequency trap

Cited by 23 publications

References 29 publications

REACTION STUDIES OF NEUTRAL ATOMIC C WITH ${{\rm{H}}}_{3}^{+}$ USING A MERGED-BEAMS APPARATUS

REACTION STUDIES OF NEUTRAL ATOMIC C WITH ${{\rm{H}}}_{3}^{+}$ USING A MERGED-BEAMS APPARATUS

Accurate ab initio-based double many-body expansion potential energy surface for the adiabatic ground-state of the C3 radical including combined Jahn-Teller plus pseudo-Jahn-Teller interactions

A novel merged beams apparatus to study anion-neutral reactions

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