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Watanabe, Ayako; Dutta, C. M.; Nordlander, Peter; Kimura, Mineo; Dalgarno, A.

doi:10.1103/physreva.66.044701

Cited by 22 publications

(12 citation statements)

References 34 publications

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“…From (Tomza, 2015). (Li et al, 2015), Na + +Rb (Yan et al, 2014(Yan et al, , 2013, Be + +Li (Rakshit and Deb, 2011), H + +Na/K (Watanabe et al, 2002), H + +D . The non-radiative charge transfer driven by nonadiabatic couplings has been theoretically investigated for Ca + +Rb (Belyaev et al, 2012;Tacconi et al, 2011) and Yb + +Rb (Sayfutyarova et al, 2013).…”

Section: Radiative and Non-radiative Charge Transfermentioning

confidence: 99%

Cold hybrid ion-atom systems

et al. 2019

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Hybrid systems of laser-cooled trapped ions and ultracold atoms combined in a single experimental setup have recently emerged as a new platform for fundamental research in quantum physics. This paper reviews the theoretical and experimental progress in research on cold hybrid ion-atom systems which aim to combine the best features of the two well-established fields. We provide a broad overview of the theoretical description of ion-atom mixtures and their applications, and report on advances in experiments with ions trapped in Paul or dipole traps overlapped with a cloud of cold atoms, and with ions directly produced in a Bose-Einstein condensate. We start with microscopic models describing the electronic structure, interactions, and collisional physics of ion-atom systems at low and ultralow temperatures, including radiative and non-radiative charge transfer processes and their control with magnetically tunable Feshbach resonances. Then we describe the relevant experimental techniques and the intrinsic properties of hybrid systems. In particular, we discuss the impact of the micromotion of ions in Paul traps on ion-atom hybrid systems. Next, we review recent proposals for using ions immersed in ultracold gases for studying cold collisions, chemistry, many-body physics, quantum simulation, and quantum computation and their experimental realizations. In the last part we focus on the formation of molecular ions via spontaneous radiative association, photoassociation, magnetoassociation, and sympathetic cooling. We discuss applications and prospects of cold molecular ions for cold controlled chemistry and precision spectroscopy.

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Section: Radiative and Non-radiative Charge Transfermentioning

confidence: 99%

Cold hybrid ion-atom systems

et al. 2019

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“…5 The pres ent agreement with the mea sure ments is ex cel lent; the dis crep ancy is less than 0.2% ex cept for Sb 29+ ( 0.5% er ror) and Xe 32+ ( 0.4% er ror). For Sm 40+ and Eu 41+ , Watanabe et al 11 ob served…”

Section: Re Sults and Discussionmentioning

confidence: 99%

“…Af ter the first mea sure ment by Mor gan et al, 2 fur ther wave length mea sure ments have been pur sued by sev eral groups. [6][7][8][9][10][11] Avail able mea sure ments now cover a wide range of Z (= 51-83). It is note wor thy that, in Ref.…”

Section: Introductionmentioning

confidence: 99%

Fine‐structure in 3d⁴ States of Highly Charged Ti‐like Ions

Kato¹,

Tong²,

Watanabe³

et al. 2001

J Chinese Chemical Soc

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A remarkable improvement of ab initio calculations was obtained for wavelengths of (3d4) J = 3 → 2 forbid den transition. Present calculations reduced the long‐standing discrepancy from measurements down to less than 0.2% for most high‐Z titanium‐like ions. In the present calculations, a large extent of configuration space was included so that most important many‐body effects were taken into account. To this end, the linearized second‐order Brillouin‐Wigner perturbation theory was employed with optimized spin‐orbitals. Transition probability and atomic g‐factor were also calculated with the improved atomic wave functions.

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“…The physical properties of UDs have been extensively studied by several authors (Sobotka et al 1997;Riethmüller et al 2008;Hamedivafa 2011;Watanabe et al 2012;Louis et al 2012a), but they are primarily confined to time sequence observations of single spots or spots in a single active region (AR). Watanabe (2014) investigated the spatial distribution of UDs in several sunspots using Hinode observations. The results showed that UDs became more clustered in the latter phase of sunspots.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Relation between Sunspots and Umbral Dots

Yadav

Louis

Mathew

2018

ApJ

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Umbral dots (UDs) are transient, bright features observed in the umbral region of a sunspot. We study the physical properties of UDs observed in sunspots of different sizes. The aim of our study is to relate the physical properties of umbral dots with the large-scale properties of sunspots. For this purpose, we analyze high-resolution G-band images of 42 sunspots observed by Hinode/SOT, located close to disk center. The images were corrected for instrumental stray-light and restored with the modeled PSF. An automated multi-level tracking algorithm was employed to identify the UDs located in selected G-band images. Furthermore, we employed HMI/SDO, limb-darkening corrected, full disk continuum images to estimate the sunspot phase and epoch for the selected sunspots. The number of UDs identified in different umbrae exhibits a linear relation with the umbral size. The observed filling factor ranges from 3% to 7% and increases with the mean umbral intensity. Moreover, the filling factor shows a decreasing trend with the umbral size. We also found that the observed mean and maximum intensities of UDs are correlated with the mean umbral intensity. However, we do not find any significant relationship between the mean (and maximum) intensity and effective diameter of umbral dots with the sunspot area, epoch, and decay rate. We suggest that this lack of relation could either be due to the distinct transition of spatial scales associated with overturning convection in the umbra or the shallow depth associated with umbral dots, or both the above.

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Charge-transfer cross sections for radiative charge transfer inNa+H+andK+

Cited by 22 publications

References 34 publications

Cold hybrid ion-atom systems

Cold hybrid ion-atom systems

Fine‐structure in 3d⁴ States of Highly Charged Ti‐like Ions

Investigating the Relation between Sunspots and Umbral Dots

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Charge-transfer cross sections for radiative charge transfer inNa+H+andK+

Cited by 22 publications

References 34 publications

Cold hybrid ion-atom systems

Cold hybrid ion-atom systems

Fine‐structure in 3d4 States of Highly Charged Ti‐like Ions

Investigating the Relation between Sunspots and Umbral Dots

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Product

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Fine‐structure in 3d⁴ States of Highly Charged Ti‐like Ions