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Ferber, R.; Klincare, I.; Nikolayeva, O.; Tamanis, M.; Knöckel, H.; Tiemann, E.; Pashov, A.

doi:10.1103/physreva.80.062501

Cited by 48 publications

(78 citation statements)

References 32 publications

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“…Thus it must be included in deriving PECs from spectroscopic data being a requisite for reliably estimating the probabilities of optical cycles for an efficient transfer of ultracold molecules from weakly bound rovibronic levels close to dissociation limit into the deeply bound molecules, preferably in their absolute rovibronic ground X(v = 0,J = 0) state. The desired data may be provided by conventional Fourier-transform (FT) spectroscopy as was demonstrated in [6] for NaRb, [7] for NaCs, [8] for KRb, [9,10] for KCs, and [11] for RbCs. In these studies a fitting routine incorporating coupled-channel calculations was applied to construct simultaneously the PECs for a 3 + and X 1 + states close to the atom-pair asymptote.…”

Section: Introductionmentioning

confidence: 99%

Long-range coupling ofX1Σ+anda3Σ+
Ferber
¹
,
Nikolayeva
²
,
Tamanis
³

et al. 2013
Phys. Rev. A
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The K and Cs atom pair and its X 1 + and a 3 + electronic molecular states are studied by Fourier-transform spectroscopy with special emphasis on bound states close to the ground state asymptote (4s)K + (6s)Cs. Significant vibrational mixing due to hyperfine coupling was observed leading to improved potential energy curves for both states. The observed intensity pattern of the hyperfine structure for the last vibrational levels of X 1 + and a 3 + reveals deep insight into the multicomponent wave function of such levels with its influence for modeling the asymptotic behavior of the excited electronic states involved in the reported observations. Examples of derived properties of cold collisions are given and the importance of the present results for efficient production schemes for ultracold KCs is discussed.

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Section: Introductionmentioning

confidence: 99%

Long-range coupling ofX1Σ+anda3Σ+
Ferber
¹
,
Nikolayeva
²
,
Tamanis
³

et al. 2013
Phys. Rev. A
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26
4
99
0
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“…All potentials had to be modified by incorporating a substantial amount of spectroscopic data (see, e.g., Ref. [14]). The same issue becomes much more severe for multidimensional PES in reactions, and will likely remain so for many years to come.…”

Section: Introductionmentioning

confidence: 99%

Quantum Langevin model for exoergic ion-molecule reactions and inelastic processes

Gao

2011

Phys. Rev. A

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We present a fully quantal version of the Langevin model for the total rate of exoergic ion-molecule reactions or inelastic processes. The model, which is derived from a rigorous multichannel quantum-defect formulation of bimolecular processes, agrees with the classical Langevin model at sufficiently high temperatures. It also gives an analytic description of ion-molecule reactions and inelastic processes in the ultracold regime where the quantum nature of the relative motion between the reactants becomes important.

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“…for a virtual vibrational level with the zero bounding energy E a (N = 0) = 0. The singlet-triplet X 1 Σ + ∼ a 3 Σ + perturbation of the initial level caused by a hyperfine Fermi contact interaction [11] was neglected. The upper limit of the termvalues for the A ∼ b complex E CC j (J ′ = 1) was limited by 13200 cm −1 in order to avoid an extrapolation error outside the experimental region.…”

Section: Intensity Distribution In Thementioning

confidence: 99%

“…The highly accurate empirical potentials for the ground singlet A 1 Σ + and triplet a 3 Σ + states converging to the lowest K(4S)+Cs(6S) asymptote (see Fig. 1) as well as predicted scattering lengths and Feshbach resonances which are required to simulate cold collision processes are presented in Ref's [10,11]. However, till now there is no empirical information about the excited states of KCs while ab initio potential energy curves (PECs) have been calculated for a wide range of internuclear distance in the framework of pure Hund's (a) [12,13,14] and (c) [15] coupling cases.…”

Section: Introductionmentioning

confidence: 99%

Fourier-transform spectroscopy and coupled-channels deperturbation treatment of theA 1Σ+–b 3Πcomplex of KCs

et al. 2010

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The laser induced fluorescence (LIF) spectra A 1 Σ + ∼ b 3 Π(E J ) → X 1 Σ + of KCs dimer were recorded in near infrared region by Fourier Transform Spectrometer with a resolution of 0.03 cm −1 . Overall more than 200 collisionally enhanced LIF spectra were rotationally assigned to 39 K 133 Cs and 41 K 133 Cs isotopomers yielding with the uncertainty of 0.003-0.01 cm −1 more than 3400 rovibronic term values of the strongly mixed singlet A 1 Σ + and triplet b 3 Π states. Experimental data massive starts from the lowest vibrational level vA = 0 of the singlet and nonuniformly cover the energy range E J ∈ [10040, 13250] cm −1 with rotational quantum numbers J ∈ [7, 225]. Besides of the dominating regular A 1 Σ + ∼ b 3 ΠΩ=0 interactions the weak and local heterogenous A 1 Σ + ∼ b 3 ΠΩ=1 perturbations have been discovered and analyzed. Coupled-channel deperturbation analysis of the experimental 39 K 133 Cs e-parity termvalues of the A 1 Σ + ∼ b 3 ΠΩ=0,1,2 complex was accomplished in the framework of the phenomenological 4 × 4 Hamiltonian accounting implicitly for regular interactions with the remote 1 Π and 3 Σ + states manifold. The resulting diabatic potential energy curves of the interacting states and relevant spin-orbit coupling matrix elements defined analytically by Expanded Morse Oscillators model reproduce 95% of experimental data field of the 39 K 133 Cs isotopomer with a standard deviation of 0.004 cm −1 which is consistent with the uncertainty of the experiment. Reliability of the derived parameters was additionally confirmed by a good agreement between the predicted and experimental termvalues of 41 K 133 Cs isotopomer. Calculated relative intensity distributions in the A ∼ b → X LIF progressions are also consistent with their experimental counterparts. Finally, the deperturbation model was applied for a simulation of pump-dump optical cycle a 3 Σ + → A 1 Σ + ∼ b 3 Π → X 1 Σ + proposed for transformation of ultracold colliding K+Cs pairs to their ground molecular state vX = 0; JX = 0.

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X Σ1+anda Σ

Cited by 48 publications

References 32 publications

Long-range coupling ofX1Σ+anda3Σ+
Ferber
¹
,
Nikolayeva
²
,
Tamanis
³

et al. 2013
Phys. Rev. A
Self Cite
26
4
99
0
View full text Add to dashboard Cite

Long-range coupling ofX1Σ+anda3Σ+
Ferber
¹
,
Nikolayeva
²
,
Tamanis
³

et al. 2013
Phys. Rev. A
Self Cite
26
4
99
0
View full text Add to dashboard Cite

Quantum Langevin model for exoergic ion-molecule reactions and inelastic processes

Fourier-transform spectroscopy and coupled-channels deperturbation treatment of theA 1Σ+–b 3Πcomplex of KCs

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X Σ1+anda Σ

Cited by 48 publications

References 32 publications

Long-range coupling ofX1Σ+anda3Σ+Ferber1, Nikolayeva2, Tamanis3 et al. 2013Phys. Rev. ASelf Cite264990View full textAdd to dashboardCite

Long-range coupling ofX1Σ+anda3Σ+Ferber1, Nikolayeva2, Tamanis3 et al. 2013Phys. Rev. ASelf Cite264990View full textAdd to dashboardCite

Quantum Langevin model for exoergic ion-molecule reactions and inelastic processes

Fourier-transform spectroscopy and coupled-channels deperturbation treatment of theA 1Σ+–b 3Πcomplex of KCs

Contact Info

Product

Resources

About

Long-range coupling ofX1Σ+anda3Σ+
Ferber
¹
,
Nikolayeva
²
,
Tamanis
³

et al. 2013
Phys. Rev. A
Self Cite
26
4
99
0
View full text Add to dashboard Cite

Long-range coupling ofX1Σ+anda3Σ+
Ferber
¹
,
Nikolayeva
²
,
Tamanis
³

et al. 2013
Phys. Rev. A
Self Cite
26
4
99
0
View full text Add to dashboard Cite