Resonances in Ca<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mo>+</mml:mo></mml:msup><mml:mspace width="0.16em" /><mml:mo>+</mml:mo><mml:mspace width="0.16em" /></mml:mrow></mml:math>Rb nonadiabatic collisions at ultralow energies

Belyaev, Andrey K.; Yakovleva, Svetlana A.; Tacconi, M.; Gianturco, F. A.

doi:10.1103/physreva.85.042716

Cited by 19 publications

(45 citation statements)

References 15 publications

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“…The pattern of shape resonances appears similar to the one found for the NRCT process in the same entrance channel in Ref. [16]. …”

Section: Resultssupporting

confidence: 84%

“…2(a) suggest that the (2) 1 Σ + state is coupled by spin-orbit (SO) interaction to the (1) 3 Π state leading to non-radiative charge transfer (NRCT). Gianturco and coworkers [16,43] have shown that this process has a significant cross section (2) 1 Σ + PEC associated with the lowest accessible collision channel Rb(5s)+Ca + (4s) and the (1) 3 Π PEC around which strong non-adiabatic interactions caused by spin-orbit coupling lead to non-radiative charge transfer (NRCT) [43].…”

Section: Resultsmentioning

confidence: 99%

“…These developments have enabled the study of ion-neutral collisional processes down to collision energies corresponding to a few mK. In this domain (often referred to as the "cold" regime), only a few partial waves contribute to the collisions, and resonance as well as radiative effects can become important [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

et al. 2013

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Cold chemical reactions between laser-cooled Ca+ ions and Rb atoms were studied in an ion-atom hybrid trap. Reaction rate constants were determined in the range of collision energies E coll /kB = 20 mK-20 K. The lowest energies were achieved in experiments using single localized Ca + ions. Product branching ratios were studied using resonant-excitation mass spectrometry. The dynamics of the reactive processes in this system (non-radiative and radiative charge transfer as well as radiative association leading to the formation of CaRb + molecular ions) have been analyzed using high-level quantum-chemical calculations of the potential energy curves of CaRb + and quantumscattering calculations for the radiative channels. For the present low-energy scattering experiments, it is shown that the energy dependence of the reaction rate constants is governed by long-range interactions in line with the classical Langevin model, but their magnitude is determined by shortrange non-adiabatic and radiative couplings which only weakly depend on the asymptotic energy. The quantum character of the collisions is predicted to manifest itself in the occurrence of narrow shape resonances at well-defined collision energies. The present results highlight both universal and system-specific phenomena in cold ion-neutral reactive collisions.

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“…The pattern of shape resonances appears similar to the one found for the NRCT process in the same entrance channel in Ref. [16]. …”

Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

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Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

et al. 2013

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“…The RA process is even more favored in RbBa + due to the double well in the A potential curve, which enhances the spontaneous emission towards X bound levels around the top of the barrier where the TEDM is large. In all cases, the shape resonances in the RA and RCT cross sections are the same, as they are due to the centrifugal barrier in the entrance channel (see also [67,73]). In the framework of the present model, the choice of the isotopologues for each ionic species does not yield significantly different cross sections in magnitude, as the reduced mass (which differs by less than one percent among a series of isotopologues of a given ion) is involved only through the kinetics described by the radial wave functions.…”

Section: Cross Sections and Rates For Ra And Rctmentioning

confidence: 87%

“…There is only one other work reporting about the molecular structure of RbCa + [38,73] for the study of NRCT. The authors used a so-called 'small core' ECPs where electrons from the s 4 and p 4 shells in Rb, and from Note: * symbol for [13] indicates that the authors reported spectroscopic constants for the 7 Li 172 Yb + isotope.…”

Section: Electronic Structure Calculations For (Alk-alke) + Molecularmentioning

confidence: 99%

Formation of molecular ions by radiative association of cold trapped atoms and ions

et al. 2015

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Radiative emission during cold collisions between trapped laser-cooled Rb atoms and alkaline-earth ions (Ca + , Sr + , Ba + ) and Yb + , and between Li and Yb + , are studied theoretically, using accurate effective core potential based quantum chemistry calculations of potential energy curves and transition dipole moments of the related molecular ions. Radiative association of molecular ions is predicted to occur for all systems with a cross section two to ten times larger than the radiative charge transfer one. Partial and total rate constants are also calculated and compared to available experiments. Narrow shape resonances are expected, which could be detectable at low temperature with an experimental resolution at the limit of the present standards. Vibrational distributions are also calculated, showing that the final molecular ions are not created in their ground state level. p c k J J D R J J J D R J PEC for all systems. The lowest Π 3 PEC of Rb-Ca + is also displayed for completeness. (c) Transition electric dipole moments between the X and A states. Open circles: [74]. The vertical dotted lines tag the inner turning points of the incoming continuum wave function-in the entrance channel-with the respective points in the exit channel and the transition dipole moment magnitude at that position. p c k J J v D R J J J v D R J ( ) 8 3

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Inelastic processes in atomic, molecular and chemical physics (in honour of Andrey K. Belyaev)

Barklem

Tscherbul²

2015

Chemical Physics

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Resonances in Ca++Rb nonadiabatic collisions at ultralow energies

Cited by 19 publications

References 15 publications

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

Formation of molecular ions by radiative association of cold trapped atoms and ions

Inelastic processes in atomic, molecular and chemical physics (in honour of Andrey K. Belyaev)

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Resonances in Ca++Rb nonadiabatic collisions at ultralow energies

Cited by 19 publications

References 15 publications

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca+ ions and Rb atoms in an ion-atom hybrid trap

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca+ ions and Rb atoms in an ion-atom hybrid trap

Formation of molecular ions by radiative association of cold trapped atoms and ions

Inelastic processes in atomic, molecular and chemical physics (in honour of Andrey K. Belyaev)

Contact Info

Product

Resources

About

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap

Ion-neutral chemistry at ultralow energies: dynamics of reactive collisions between laser-cooled Ca⁺ ions and Rb atoms in an ion-atom hybrid trap