Isotope effect for associative detachment:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>H</mml:mtext><mml:msup><mml:mrow><mml:mo>(</mml:mo><mml:mtext>D</mml:mtext><mml:mo>)</mml:mo></mml:mrow><mml:mo>−</mml:mo></mml:msup><mml:mo>+</mml:mo><mml:mtext>H</mml:mtext><mml:mrow><mml:mo>(</mml:mo><mml:mtext>D</mml:mtext><mml:mo>)</mml:mo></mml:mrow><mml:mo>→</mml:mo><mml:msub><mml:mtext>H</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub

Miller, Kenneth A.; Bruhns, H.; Čı́žek, M.; Eliášek, Jiří; Cabrera‐Trujillo, R.; Kreckel, H.; O'Connor, Aodh; Urbain, Xavier; Savin, D. W.

doi:10.1103/physreva.86.032714

Cited by 32 publications

(26 citation statements)

References 25 publications

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“…We have previously used this technique to produce beams of neutral atomic H and D for studies of associative detachment (Bruhns et al 2010a(Bruhns et al , 2010bMiller et al 2011Miller et al , 2012. Additional details can be found in O'Connor et al…”

Section: Neutral Beammentioning

confidence: 99%

Experimental and Theoretical Studies of the Isotope Exchange Reaction

Hillenbrand

Bowen

Liévin

et al. 2019

ApJ

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Deuterated molecules are important chemical tracers of prestellar and protostellar cores. Up to now, the titular reaction has been assumed to contribute to the generation of these deuterated molecules. We have measured the merged-beams rate coefficient for this reaction as a function of the relative collision energy in the range of about 10 meV-10 eV. By varying the internal temperature of the reacting + H 3 molecules, we found indications for the existence of a reaction barrier. We have performed detailed theoretical calculations for the zero-point-corrected energy profile of the reaction and determined a new value for the barrier height of ≈68 meV. Furthermore, we have calculated the tunneling probability through the barrier. Our experimental and theoretical results show that the reaction is essentially closed at astrochemically relevant temperatures. We derive a thermal rate coefficient of <1×10 −12 cm 3 s −1 for temperatures below 75 K with tunneling effects included and below 155 K without tunneling.

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Section: Neutral Beammentioning

confidence: 99%

Experimental and Theoretical Studies of the Isotope Exchange Reaction

Hillenbrand

Bowen

Liévin

et al. 2019

ApJ

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“…1 However, the interest in anions diminished because, due to a lack of spectroscopic data, they could not be detected. This has changed recently when the first anions were observed in the interstellar medium, [2][3][4] reactivating the interest in theory 5,6 and experiments [7][8][9][10][11][12][13] with anion-molecule reactions, including associative detachment reactions. Also photodetachment of electrons from anions including interstellar anions has been reported.…”

Section: Introductionmentioning

confidence: 99%

H/D exchange in reactions of OH⁻ with D₂ and of OD⁻ with H₂ at low temperatures

Mulin

Roučka

Jusko

et al. 2015

Phys. Chem. Chem. Phys.

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Using a cryogenic linear 22-pole rf ion trap, rate coefficients for H/D exchange reactions of OH(-) with D2 (1) and OD(-) with H2 (2) have been measured at temperatures between 11 K and 300 K with normal hydrogen. Below 60 K, we obtained k1 = 5.5 × 10(-10) cm(3) s(-1) for the exoergic . Upon increasing the temperature above 60 K, the data decrease with a power law, k1(T) ∼T(-2.7), reaching ≈1 × 10(-10) cm(3) s(-1) at 200 K. This observation is tentatively explained with a decrease of the lifetime of the intermediate complex as well as with the assumption that scrambling of the three hydrogen atoms is restricted by the topology of the potential energy surface. The rate coefficient for the endoergic increases with temperature from 12 K up to 300 K, following the Arrhenius equation, k2 = 7.5 × 10(-11) exp(-92 K/T) cm(3) s(-1) over two orders of magnitude. The fitted activation energy, EA-Exp = 7.9 meV, is in perfect accordance with the endothermicity of 24.0 meV, if one accounts for the thermal population of the rotational states of both reactants. The low mean activation energy in comparison with the enthalpy change in the reaction is mainly due to the rotational energy of 14.7 meV contributed by ortho-H2 (J = 1). Nonetheless, one should not ignore the reactivity of pure para-H2 because, according to our model, it already reaches 43% of that of ortho-H2 at 100 K.

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“…Although not directly measurable from experiments, the EoS is of crucial importance to understand the phase diagram of QCD. One can for example a F.R.S.-FNRS Postdoctoral researcher; fabien.buisseret@umons.ac.be read the reviews [3] for complete discussions of the various EoS computed so far: with or without quark flavors, at zero chemical potential or not, etc. More results can be found for example in [4,5].…”

Section: Introductionmentioning

confidence: 99%

A minimal quasiparticle approach for the QGP and its large-N c limits

Buisseret

Lacroix

2010

Eur. Phys. J. C

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We propose a quasiparticle approach allowing to compute the equation of state of a generic gauge theory with gauge group SU(Nc) and quarks in an arbitrary representation. Our formalism relies on the thermal quasiparticle masses (quarks and gluons) computed from perturbative techniques, in which the standard two-loop running coupling constant is used. Our model is minimal in the sense that we do not allow any extra ansatz concerning the temperature-dependence of the running coupling. We first show that it is able to reproduce the most recent equations of state computed on the lattice for temperatures typically higher than 2 Tc. Well above Tc indeed, an ideal gas framework with thermal masses is indeed expected to be relevant. Then we study the accuracy of various inequivalent large-Nc limits concerning the description of the QCD results, as well as the equivalence between the QCDAS limit and the N = 1 SUSY Yang-Mills theory.PACS. 12.38.Mh -11.15.Pg 1 Remark that a quasiparticle description of hypothetical quark stars has been proposed historically as an application of the quark hypothesis, see [6].

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Isotope effect for associative detachment:H(D)−+H(D)→H2(

Cited by 32 publications

References 25 publications

Experimental and Theoretical Studies of the Isotope Exchange Reaction

Experimental and Theoretical Studies of the Isotope Exchange Reaction

H/D exchange in reactions of OH⁻ with D₂ and of OD⁻ with H₂ at low temperatures

A minimal quasiparticle approach for the QGP and its large-N c limits

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Isotope effect for associative detachment:H(D)−+H(D)→H2(

Cited by 32 publications

References 25 publications

Experimental and Theoretical Studies of the Isotope Exchange Reaction

Experimental and Theoretical Studies of the Isotope Exchange Reaction

H/D exchange in reactions of OH− with D2 and of OD− with H2 at low temperatures

A minimal quasiparticle approach for the QGP and its large-N c limits

Contact Info

Product

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H/D exchange in reactions of OH⁻ with D₂ and of OD⁻ with H₂ at low temperatures