Molecular beam studies of weak interactions for open-shell systems: The ground and lowest excited states of rare gas oxides

Aquilanti, Vincenz̊o; Candori, R.; Pirani, Fernando

doi:10.1063/1.455432

Cited by 97 publications

(75 citation statements)

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“…, and Ti[ 3 F j ] atoms with closed-shell atoms at a high temperature [13,14,15,16]. However, there has not been no theoretical work on the fine-structure changing collisions between atoms in the 3 P 2 state at ultralow temperature achieved in the present work.…”

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confidence: 57%

“…, and Ti[ 3 F j ] colliding with closed shell atoms [13,14,15,16], they had not been seen in collisions between 3 P 2 atoms. While the recent experiment of magnetically trapped Ca atoms studied multichannel collisions between 3 P 2 atoms and discussed the possibility of the fine-structure changing process [11], we believe that our work is the first definite experimental measurement of this process between 3 P 2 atoms.…”

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confidence: 99%

“…We also measured a large two-body inelastic collision rate in the FORT which we interpret as finestructure changing collisions in this ultracold temperature regime. Although fine-structure changing inelastic collisional properties have previously been investigated for Mg[, and Ti[ 3 F j ] colliding with closed shell atoms [13,14,15,16], they had not been seen in collisions between 3 P 2 atoms. While the recent experiment of magnetically trapped Ca atoms studied multichannel collisions between 3 P 2 atoms and discussed the possibility of the fine-structure changing process [11], we believe that our work is the first definite experimental measurement of this process between 3 P 2 atoms.…”

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Inelastic Collisions in Optically Trapped Ultracold Metastable Ytterbium

et al. 2008

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We report measurement of inelastic loss in dense and cold metastable ytterbium (Yb[ 3 P2]). Use of an optical far-off-resonance trap enables us to trap atoms in all magnetic sublevels, removing multichannel collisional trap loss from the system. Trapped samples of Yb[ 3 P2] are produced at a density of 2×10 13 cm −3 and temperature of 2 µK. We observe rapid two-body trap loss of Yb[ 3 P2] and measure the inelastic collision rate constant 1.0(3)×10 −11 cm 3 s −1 . The existence of the finestructure changing collisions between atoms in the 3 P2 state is strongly suggested.PACS numbers: 37.10. De, There is increasing interest in ultracold two-electron atoms [1,2], such as the alkaline earth metals (e.g. Ca and Sr) and Yb. In particular, novel characteristics of the metastable 3 P 2 atoms have recently attracted attention, both for applications and for the study of their collisional properties [3]. These atoms are set apart from the more commonly studied alkali metal atoms because collisions between 3 P 2 atoms are intrinsically anisotropic. Recent theory has investigated the effects of this anisotropy, including its interplay with magnetic field effects, which enable novel control of the scattering length [4], and multichannel collisions due to a strong coupling among the partial waves of relative motion [5,6]. Also, the magnetic dipole-dipole interaction between 3 P 2 atoms is 9 times larger than that between alkali metal atoms. This has led to theoretical predictions such as novel quantum phases and use in quantum information systems [7,8].In order to move toward study of these new possible features of 3 P 2 atoms, several laboratories have realized laser cooling and trapping of metastable two-electron atoms. Ca and Sr atoms decaying to the 3 P 2 state from the 1 P 1 state, which is the upper state in the 1 S 0 ↔ 1 P 1 magneto-optical trap (MOT) transition, have been successfully trapped in a magnetic trap [9]. Also, a MOT operating on the 3 P 2 ↔ 3 D 3 transition has been used to load a magnetic trap [10]. In spite of successes of these approaches, evaporative cooling of 3 P 2 atoms in a magnetic trap to reach Bose-Einstein condensation (BEC) turned out to be unsuccessful due to trap loss caused by strong multichannel collision processes [5]. More recently, a similar large inelastic collision rate in Ca[ 3 P 2 , m J =2] was observed [11].The loss induced by multichannel collisions in a magnetic trap can be overcome by employing, instead of a magnetic trap, an optical far-off-resonance trap (FORT). According to Ref. [12], the FORT wavelength can be chosen so that atoms in every magnetic sublevel of the 3 P 2 state can be trapped with the same strength. As a result, although multichannel collisions can still occur, which distributes the atoms over the different magnetic sublevels, they will not lead to trap loss. Thus, any trap loss observed in such a trap must be due to a different physical mechanism. Study of these collisional properties is crucial to understanding the physics of these important class of atom...

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Inelastic Collisions in Optically Trapped Ultracold Metastable Ytterbium

et al. 2008

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“…7 that r = 0,025 Å 2 at T s = 300 K for the Ag atoms. The potential parameters for the ''noble gasses -O'' pairs are found in [19]. For the reader convenience sake all of the used potentials and their parameters are presented in Appendix 1.…”

Section: Resultsmentioning

confidence: 99%

“…Interaction potential between Ag-Ag [18] UðxÞ Interaction potential between noble gas atom and O atom [19] UðxÞ ¼ e exp À2bðx=r 0 À1Þ À 2exp Àbðx=r 0 À1Þ Â Ã ;…”

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Simulation of the influence of surface chemical composition on internal gas flow at large Knudsen numbers

Ukhov

Borisov

Porodnov

2013

International Journal of Heat and Mass Transfer

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a b s t r a c tOn the basis of the developed model, an attempt to describe a rarefied gas flow in the cylindrical channel, whose surface chemical composition conforms with the real experimental conditions, has been made. During the modeling two cases are considered: the atomically clean silver channel surface and the surface fully covered with the adsorbate, which is simulated by oxygen according to the data of the Augerspectroscopic analysis. The gas-surface interaction process is based on the molecular dynamic principle. Thermal vibrations of the surface atoms are also considered. The obtained results of calculation are compared with experimental data.Crown

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Magnetic Analysis of Supersonic Beams of Atomic Oxygen, Nitrogen, and Chlorine Generated from a Radio‐Frequency Discharge

Alagia

Aquilanti

Ascenzi

et al. 1997

Israel Journal of Chemistry

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101

127

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Abstract. Supersonic beams of oxygen, nitrogen, and chlorine atoms and of metastable oxygen and nitrogen molecules produced from a high-pressure radiofrequency discharge beam source have been characterized by coupling velocity selection with magnetic analysis in the transmission mode. The present work leads to the determination of the relative populations of the electronic states of the species in the produced beams, showing that estimates of the populations from plasma temperatures or final translational temperatures could bring on incorrect conclusions.

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Molecular beam studies of weak interactions for open-shell systems: The ground and lowest excited states of rare gas oxides

Abstract: A unitary group based openshell coupled cluster study of vibrational frequencies in ground and excited states of first row diatomics

Cited by 97 publications

References 40 publications

Inelastic Collisions in Optically Trapped Ultracold Metastable Ytterbium

Inelastic Collisions in Optically Trapped Ultracold Metastable Ytterbium

Simulation of the influence of surface chemical composition on internal gas flow at large Knudsen numbers

Magnetic Analysis of Supersonic Beams of Atomic Oxygen, Nitrogen, and Chlorine Generated from a Radio‐Frequency Discharge

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