Laser controlled charge-transfer reaction at low temperatures

Petrov, A. N.; Makrides, Constantinos; Kotochigova, Svetlana

doi:10.1063/1.4976972

Cited by 9 publications

(8 citation statements)

References 55 publications

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“…where a laser field can be employed to directly stimulate the transition to the ground electronic state [34,37] or to excite the ion-atom system to higher excited states [36].…”

Section: Vibrational Levelsmentioning

confidence: 99%

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Ab initio electronic structure and prospects for the formation of ultracold calcium–alkali-metal-atom molecular ions

et al. 2020

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Experiments with cold ion–atom mixtures have recently opened the way for the production and application of ultracold molecular ions. Here, in a comparative study, we theoretically investigate ground and several excited electronic states and prospects for the formation of molecular ions composed of a calcium ion and an alkali-metal atom: CaAlk+ (Alk = Li, Na, K, Rb, Cs). We use a quantum chemistry approach based on non-empirical pseudopotentials, operatorial core-valence correlation, large Gaussian basis sets, and full configuration interaction method for valence electrons. Adiabatic potential energy curves, spectroscopic constants, and transition and permanent electric dipole moments are determined and analyzed for the ground and excited electronic states. We examine the prospects for ion-neutral reactive processes and the production of molecular ions via spontaneous radiative association and laser-induced photoassociation. After that, spontaneous and stimulated blackbody radiation transition rates are calculated and used to obtain radiative lifetimes of vibrational states of the ground and first-excited electronic states. The present results pave the way for the formation and spectroscopy of calcium–alkali-metal-atom molecular ions in modern experiments with cold ion–atom mixtures.

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“…where a laser field can be employed to directly stimulate the transition to the ground electronic state [34,37] or to excite the ion-atom system to higher excited states [36].…”

Section: Vibrational Levelsmentioning

confidence: 99%

“…In cold ion-atom mixtures, diatomic molecular ions can be produced via collision-induced charge-transfer radiative association or light-induced photoassociation [10,[33][34][35][36][37]. The radiative association is predicted to dominate charge-transfer processes in most of the mixtures of alkaline-earth-metal ions and alkali-metal atoms.…”

Section: Introductionmentioning

confidence: 99%

Ab initio electronic structure and prospects for the formation of ultracold calcium–alkali-metal-atom molecular ions

et al. 2020

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“…Crucially, for our system both contributions to the long-range potential are diagonal in this body-fixed basis [31]. The matrix elements of C 3 , expressed in two equivalent ways, are…”

Section: Discussionmentioning

confidence: 99%

“…The MOT and catalyst lasers couple the initial photondressed Ca(4s 2 1 S 0 ) + Yb + (6s 2 S 1/2 ) + ω MOT,C and excited Ca(4s4p 1 P 1 ) + Yb + (6s 2 S 1/2 ) channels. Using a dressed-state approach [31] and in the IOSA we find coupling matrix element −(1/ √ 3) d I/(2c 0 ) in SI units between the initial Ω = ±1/2 channel and the attractive Ω = ±1/2 excited channel with the same J. Here, I is the MOT or catalyst laser intensity, 0 is the electric constant, dipole moment d = S/3 = 2.85ea 0 , using line strength S of the 4s 2 1 S 0 to 4s4p 1 P 1 transition of Ca [32], and e is the electron charge.…”

Section: Laser-induced Couplingmentioning

confidence: 99%

Excitation-assisted nonadiabatic charge-transfer reaction in a mixed atom-ion system

Mills

Puri

et al. 2019

Phys. Rev. A

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An important physical process unique to neutral-ion systems is the charge-transfer (CT) reaction. Here, we present measurements of and models for CT processes between co-trapped ultracold Ca atoms and Yb ions under well-controlled conditions. The theoretical analysis reveals the existence of three reaction mechanisms when lasers from a magneto-optical trap (MOT) and an additional catalyst laser are present. Besides the direct CT involving existent excited Ca population in the MOT, the second pathway is controlled by MOT-induced CT, whereas the third one mostly involves the additional red-detuned laser.

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“…The average values can be calculated analytically using an operator method [13,14]. If the axis displacement is zero (  = 0), then we have:…”

mentioning

confidence: 99%

Remote focusing of a light beam

Petrov¹

2015

Laser Phys. Lett.

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Remote focusing of light in a graded-index medium via mode interference is demonstrated using exact analytical solutions of the wave equation. Strong focusing of light occurs at extremely long distances and it revivals periodically with distance due to mode interference. High efficiency transfer of a strongly focused subwavelength spot through optical waveguide over large distances takes place with a period of revival. Super-oscillatory hot-spots with the sizes which are beyond the conventional Abbe diffraction limit can be observed at large distances from the source. This can provide the possibility to detect optical super-resolution information in the far-field without any evanescent waves. Far-field superresolution imaging capabilities of a graded-index waveguide are also analyzed.

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Laser controlled charge-transfer reaction at low temperatures

Cited by 9 publications

References 55 publications

Ab initio electronic structure and prospects for the formation of ultracold calcium–alkali-metal-atom molecular ions

Ab initio electronic structure and prospects for the formation of ultracold calcium–alkali-metal-atom molecular ions

Excitation-assisted nonadiabatic charge-transfer reaction in a mixed atom-ion system

Remote focusing of a light beam

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