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Jensen, M. J.; Bilodeau, R. C.; Heber, O.; Pedersen, H. B.; Safvan, C. P.; Urbain, Xavier; Zajfman, D.; Andersen, L. H.

doi:10.1103/physreva.60.2970

Cited by 70 publications

(59 citation statements)

References 46 publications

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“…However, the data are not directly comparable, since isotopologue effects are well known. A similar tendency of the smaller rate coefficient for deuterated species has been observed in previous DR studies; see, e.g., H 3 O + vs. D 3 O + (Neau et al 2000), H 2 O + vs. HDO + (Jensen et al 1999), and NH + 4 vs. ND + 4 (Ö jekull et al 2004). In the case of protonated water, the rate coefficient at 300 K for D 3 O + was 2 times lower than for H 3 O + , and similar ratios were found for the other mentioned ions.…”

Section: Resultssupporting

confidence: 65%

Dissociative Recombination of D₃S⁺: Product Branching Fractions and Absolute Cross Sections

Kamińska

Vigren

Zhaunerchyk

et al. 2008

ApJ

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The dissociative recombination ( DR) of D 3 S + has been studied at the heavy ion storage ring CRYRING. The absolute DR cross sections have been measured over the interaction energy range between $0 and 0.1 eV, and the energy-dependent cross section obtained is best fitted by the expression (E) ¼ (1:3 AE 0:3) ; 10 À16 E À1:36AE0:04 cm 2 . From the cross section the thermal rate coefficient has been deduced to be (2:8 AE 0:7) ; 10 À7 (T /300) À0:86AE0:03 cm 3 s À1 . The branching fractions in the reaction have been measured at $0 eV collision energy. The break-up into D 2 S+D occurs with a probability of only 0:17 AE 0:08, whereas the three-body channel DS+2D dominates with a probability of 0:58 AE 0:11. The remaining channels DS+D 2 and S+D 2 +D contribute with 0:15 AE 0:07 and 0:10 AE 0:06, respectively. The impact of these results on the sulfur chemistry and deuterium fractionation in dark molecular clouds was investigated through chemical kinetic models. With these data, the calculated fractional abundance of H 2 S is lower than observed in TMC-1, which supports the assertion that H 2 S is formed on grain surfaces and not through gas-phase reactions.

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Section: Resultssupporting

confidence: 65%

Dissociative Recombination of D₃S⁺: Product Branching Fractions and Absolute Cross Sections

Kamińska

Vigren

Zhaunerchyk

et al. 2008

ApJ

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“…A strong energy dependence is also observed in the DR of the proton-bridged D 5 O 2 + cluster ion. 34 Comparing the latter cross section to that of the DR of H 2 O + reported by Jensen et al 35 reveals a similar behavior; the cross sections are similar at 0.2 eV, while near 0 eV they differ by a factor of 10. As far as we know, no cross sections of other weakly bound dimer ions have been measured as a function of collision energy.…”

Section: Discussionsupporting

confidence: 59%

Dissociative recombination of the weakly bound NO-dimer cation: Cross sections and three-body dynamics

Petrignani

Andersson

Pettersson

et al. 2005

The Journal of Chemical Physics

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Dissociative recombination ͑DR͒ of the dimer ion ͑NO͒ 2 + has been studied at the heavy-ion storage ring CRYRING at the Manne Siegbahn Laboratory, Stockholm. The experiments were aimed at determining details on the strongly enhanced thermal rate coefficient for the dimer, interpreting the dissociation dynamics of the dimer ion, and studying the degree of similarity to the behavior in the monomer. The DR rate reveals that the very large efficiency of the dimer rate with respect to the monomer is limited to electron energies below 0.2 eV. The fragmentation products reveal that the breakup into the three-body channel NO+O+N dominates with a probability of 0.69± 0.02. The second most important channel yields NO + NO fragments with a probability of 0.23± 0.03. Furthermore, the dominant three-body breakup yields electronic and vibrational ground-state products, NO͑ =0͒ +N͑ 4 S͒ +O͑ 3 P͒, in about 45% of the cases. The internal product-state distribution of the NO fragment shows a similarity with the product-state distribution as predicted by the Franck-Condon overlap between a NO moiety of the dimer ion and a free NO. The dissociation dynamics seem to be independent of the NO internal energy. Finally, the dissociation dynamics reveal a correlation between the kinetic energy of the NO fragment and the degree of conservation of linear momentum between the O and N product atoms. The observations support a mechanism in which the recoil takes place along one of the NO bonds in the dimer.

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“…The phenomenon has been observed for several polyatomic ions see e.g. Vigren et al (2008); Jensen et al (1999);Zhaunerchyk (2008).…”

Section: Implications Of Rate Constantsmentioning

confidence: 96%

Experimental studies of the dissociative recombination processes for the dimethyl ether ions CD₃OCD$_{2}^{+}$ and (CD₃)₂OD⁺

Hamberg¹,

Österdahl²,

Thomas³

et al. 2010

A&A

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Aims. Determination of branching fractions, cross sections and thermal rate coefficients for the dissociative recombination of CD 3 OCD 2 + (0-0.3 eV) and (CD 3 ) 2 OD + (0-0.2 eV) at the low relative kinetic energies encountered in the interstellar medium. Methods. The measurements were carried out using merged electron and ion beams at the CRYRING storage ring, Stockholm, Sweden.Results. For (CD 3 ) 2 OD + we have experimentally determined the branching fraction for ejection of a single hydrogen atom in the DR process to be maximally 7% whereas 49% of the reactions involve the break up of the COC chain into two heavy fragments and 44% ruptures both C-O bonds. The DR of CD 3 OCD 2 + is dominated by fragmentation of the COC chain into two heavy fragments. The measured thermal rate constants and cross sections are k(T ) = 1.7 ± 0.5 × 10 −6 (T/300) −0.77±0.01 cm 3 s −1 , σ = 1.2 ± 0.4 × 10 −15 (E cm [eV]) −1.27±0.01 cm 2 and k(T ) = 1.7 ± 0.6 × 10 −6 (T/300) −0.70 ± 0.02 cm 3 s −1 , σ = 1.7 ± 0.6 × 10 −15 (E cm [eV]) −1.20±0.02 cm 2 for CD 3 OCD 2 + and (CD 3 ) 2 OD + , respectively.

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Dissociative recombination and excitation ofH2O+and

Cited by 70 publications

References 46 publications

Dissociative Recombination of D₃S⁺: Product Branching Fractions and Absolute Cross Sections

Dissociative Recombination of D₃S⁺: Product Branching Fractions and Absolute Cross Sections

Dissociative recombination of the weakly bound NO-dimer cation: Cross sections and three-body dynamics

Experimental studies of the dissociative recombination processes for the dimethyl ether ions CD₃OCD$_{2}^{+}$ and (CD₃)₂OD⁺

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Dissociative recombination and excitation ofH2O+and

Cited by 70 publications

References 46 publications

Dissociative Recombination of D3S+: Product Branching Fractions and Absolute Cross Sections

Dissociative Recombination of D3S+: Product Branching Fractions and Absolute Cross Sections

Dissociative recombination of the weakly bound NO-dimer cation: Cross sections and three-body dynamics

Experimental studies of the dissociative recombination processes for the dimethyl ether ions CD3OCD$_{2}^{+}$ and (CD3)2OD+

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Dissociative Recombination of D₃S⁺: Product Branching Fractions and Absolute Cross Sections

Dissociative Recombination of D₃S⁺: Product Branching Fractions and Absolute Cross Sections

Experimental studies of the dissociative recombination processes for the dimethyl ether ions CD₃OCD$_{2}^{+}$ and (CD₃)₂OD⁺