Electron-induced processes in H+2, D+2and T+2

Stroe, Marius Cristian; Fifirig, Magda

doi:10.1088/0953-4075/42/20/205203

Cited by 15 publications

(11 citation statements)

References 34 publications

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“…Note the review on the electron-scattering cross sections for elastic and inelastic processes at different electron energies for HD and D 2 molecules [34]. This paper continues a previous work [35] investigating the slow electron collision with the D + 2 molecular ion in its electronic ground state and in a low vibrational level (0 − 2). Here we are focused on the D + 2 dissociation for a Franck-Condon distribution of the initial vibrational levels given by electron impact ionization of D 2 .…”

supporting

confidence: 53%

Dissociation of vibrationally excited by electrons

Stroe

Fifirig

2011

Molecular Physics

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We have investigated the electron impact dissociation of the deuterium molecular cation assuming a Franck-Condon distribution of the initial vibrational states given by electron impact ionization of D 2. The electron energy range 1 − 12 eV has been considered. The relative contributions of the initial vibrational states to the total cross sections of the D + 2 dissociative recombination and excitation have been determined.

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supporting

confidence: 53%

Dissociation of vibrationally excited by electrons

Stroe

Fifirig

2011

Molecular Physics

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“…As such, they argued that the heavier system is more likely to autoionize than the lighter one, which therefore reduces the apparent DR cross section. The DR cross sections calculated theoretically for H 2 + , D 2 + and T 2 + , by Stroe and Fifirig, 15 also showed an isotopic effect with T 2 + having the lowest DR cross section and H 2 + the highest. The authors explained this by stating that the cross section for electron capture is determined by the Franck-Condon overlap between the initial bound and dissociate wave functions, which is different for the isotopomers.…”

Section: Results and Discussion On Isotopic Effectsmentioning

confidence: 91%

Dissociative recombination of the acetaldehyde cation, CH3CHO+

Vigren

Hamberg

Zhaunerchyk

et al. 2010

Phys. Chem. Chem. Phys.

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The dissociative recombination of the acetaldehyde cation, CH(3)CHO(+), has been investigated at the heavy ion storage ring CRYRING at the Manne Siegbahn Laboratory in Stockholm, Sweden. The dependence of the absolute cross section of the reaction on the relative kinetic energy has been determined and a thermal rate coefficient of k(T) = (1.5 ± 0.2) × 10(-6) (T/300)(-0.70±0.02) cm(3) s(-1) has been deduced, which is valid for electron temperatures between ∼10 and 1000 K. The branching fractions of the reaction were studied at ∼0 eV relative kinetic energy and we found that breaking one of the bonds between two of the heavy atoms occurs in 72 ± 2% of the reactions. In the remaining events the three heavy atoms stay in the same product fragment. While the branching fractions are fairly similar to the results from an earlier investigation into the dissociative recombination of the fully deuterated acetaldehyde cation, CD(3)CDO(+), the thermal rate coefficient is somewhat larger for CH(3)CHO(+). Astrochemical implications of the results are discussed.

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“…Наибольшее количество из них посвящено процессу ДВ молекулярных ионов водорода и их изотопов. Экспериментальные исследования проводились в [34][35][36] для H + 2 и в [37] для H + 3 , в то время как теоретические в [18,[38][39][40][41] для H + 2 , в [42,43] для H + 3 , а также в [40] для D + 2 и T + 2 . Кроме того, ряд работ посвящен исследованию процессов диссоциативного возбуждения (2) гомоядерных ионов инертных газов ввиду важной роли таких ионов в плазменных средах, возбуждаемых электронным пучком, в газовых разрядах и с помощью оптической накачки лазерным излучением.…”

Section: Introductionunclassified

“…Еще одна задача работы состоит в сравнительном анализе эффективностей процессов (1) и (2) для гомоядерных и гетероядерных ионов. Подобное сравнение было проведено ранее для молекулярных ионов водорода и его изотопов [18,35,40,41]…”

Section: Introductionunclassified

Прямое Диссоциативное Возбуждение Гетероядерных И Гомоядерных Ионов Инертных Газов Электронным Ударом

Кислов¹,

Нариц²,

Лебедев³

2020

Журнал Технической Физики

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A theoretical description of the process of dissociative excitation of a molecular ion by electron impact in the case of effective population of a huge number of its vibrational-rotational levels is presented. Our consideration is based on the quantal version of the theory of non-adiabatic transitions between the electronic terms of a molecular ion combined with replacing the summation over vJ-levels by integration over v and J. Semianalytical formulas are derived for the integral contribution of the entire vibrational-rotational quasicontinuum to the cross sections, $\sigma_T^{\mathrm{de}}(\varepsilon)$, and the rate constants, $\alpha^{\mathrm{de}}(T, T_e)$ of the process under study in a plasma with temperatures $T_e$ and $T$ of its electronic and ionic components. The developed theory is used to study the processes of dissociative excitation of heteronuclear (HeXe$^{+}$ and ArXe$^{+}$) and homonuclear (Ar$_2^{+}$ and Xe$_2^{+}$) ions of inert gases. We demonstrate a strong dependence of the results on the ion dissociation energy and large differences in the behavior and characteristic values of $\sigma_T^{\mathrm{de}}(\varepsilon)$ and $\alpha^{\mathrm{de}}(T, T_e)$ for these systems in different ranges of electron energy, $\varepsilon$, and temperatures $T_e$ and $T$. The regions of dominance of the contributions of two competing channels are determined: direct dissociative excitation and dissociative recombination into total cross sections and the rate constants of destruction of rare gas molecular ions by electron impact. Analyzing behavior of the differential rate constants of dissociative excitation per unit range of electron energy in the final channel of reaction we demonstrate qualitative differences in the dynamics of this process for weakly bound and moderately bound molecular ions.

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Electron-induced processes in H⁺₂, D⁺₂and T⁺₂

Cited by 15 publications

References 34 publications

Dissociation of vibrationally excited by electrons

Dissociation of vibrationally excited by electrons

Dissociative recombination of the acetaldehyde cation, CH3CHO+

Прямое Диссоциативное Возбуждение Гетероядерных И Гомоядерных Ионов Инертных Газов Электронным Ударом

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