PHOTON-INDUCED EVOLUTIONARY RATES OF LiHe+(1Σ+) IN EARLY UNIVERSE FROM ACCURATE QUANTUM COMPUTATIONS

Bovino, S.; Tacconi, M.; Gianturco, F. A.

doi:10.1088/0004-637x/740/2/101

Cited by 13 publications

(8 citation statements)

References 32 publications

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“…As mentioned in the introduction, our previous study on the photon-induced evolution of LiHe + under early Universe conditions (Bovino et al 2011a(Bovino et al , 2012, has shown efficient formation of the latter molecule by resonant radiative recombination but also competitive destruction by photodissociation at low redshifts. Hence, it was suggested by the ensuing modeling of its relative abundances that the LiHe + number fraction at z ∼ 30-1 would be lower than 10 −18 by photon-induced paths only, i.e.…”

Section: The Computed Quantum Ratesmentioning

confidence: 94%

“…In particular, in this work we analyse LiHe + via a series of quantal calculations to determine the relative role of several pathways to its formation and destruction within the chemical network acting at low redshift. In previous paper (Bovino et al 2011a(Bovino et al , 2012 we examined the photonic paths to the formation and destruction of LiHe + . In the present paper we extend that work here by adding the chemical paths presiding over its evolution, i.e.…”

Section: Introductionmentioning

confidence: 99%

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LiHe$^+$ in the early Universe: a full assessment of its reaction network and final abundances

Bovino,

Curik,

Galli

et al. 2012

Preprint

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We present the results of quantum calculations based on entirely ab initio methods for a variety of molecular processes and chemical reactions involving the LiHe + ionic polar molecule. With the aid of these calculations we derive accurate reaction rates and fitting expressions valid over a range of gas temperatures representative of the typical conditions of the pregalactic gas. With the help of a full chemical network, we then compute the evolution of the abundance of LiHe + as function of redshift in the early Universe. Finally, we compare the relative abundance of LiHe + with that of other polar cations formed in the same redshift interval.

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Section: The Computed Quantum Ratesmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

LiHe$^+$ in the early Universe: a full assessment of its reaction network and final abundances

Bovino,

Curik,

Galli

et al. 2012

Preprint

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“…In order to determine the photodissociation cross sections, we calculate the absorption cross sections σ Λ j k, Λυj (E ) for the transitions between rovibrational levels (v, j) in the electronic state Λ towards the continuum of an electronic state Λ [82,83]…”

Section: Photodissociationmentioning

confidence: 99%

Life and death of a cold BaRb$^+$ molecule inside an ultracold cloud of Rb atoms

Mohammadi,

Krükow,

Mahdian

et al. 2020

Preprint

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We study the evolution of a single BaRb + molecule while it continuously collides with ultracold Rb atoms. The initially weakly-bound molecule can undergo a sequence of elastic, inelastic, reactive, and radiative processes. We investigate these processes by developing methods for discriminating between different ion species, electronic states, and kinetic ion energy ranges. By comparing the measurements to model calculations we obtain a consistent description of the typical trajectory of the ion through the manifold of available atomic and molecular states. As a further result, we determine rates for collisional and radiative relaxation as well as photodissociation, spin-flip collisions, and chemical reactions.

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“…where I(ν) is the black body radiation field (BRF) [27], a quantity further characterized by the bath temperature T b…”

Section: A the Quantum Formulation Of Ra Processesmentioning

confidence: 99%

Exploring a dynamical path for C2H− and NCO− formation in dark molecular clouds

et al. 2016

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This paper deals with the possible formation of two molecular anions often considered likely components in the physical environments of the Interstellar Medium ( ISM) : C 2 H − and NCO − . They are both discussed here by computationally following the radiative association (RA) mechanism starting from C − 2 , H, NC − and O as partners. The corresponding RA total cross sections produced by the calculations are in turn employed to generate the overall association rates over the relevant range of temperatures. The latter are found to be in line with other molecular ions formed by RA but not large enough to uniquivocally suggest this path as the main route to the anions formation in the ISM. Other possible paths of formation are also analysed and discussed.The presence of resonant structures during the association dynamics for both systems is found by the calculations and their consequences are discussed in some detail in the present study.

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PHOTON-INDUCED EVOLUTIONARY RATES OF LiHe⁺(¹Σ⁺) IN EARLY UNIVERSE FROM ACCURATE QUANTUM COMPUTATIONS

Cited by 13 publications

References 32 publications

LiHe$^+$ in the early Universe: a full assessment of its reaction network and final abundances

LiHe$^+$ in the early Universe: a full assessment of its reaction network and final abundances

Life and death of a cold BaRb$^+$ molecule inside an ultracold cloud of Rb atoms

Exploring a dynamical path for C2H− and NCO− formation in dark molecular clouds

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