New experimental data on the K2 state analyzed with the multi-parameter approach

Ahmed, Ergin; Lyyra, A. M.; Xie, Feng; Li, D.; Chu, Yiwen; Li, Li; Ivanov, V. S.; Sovkov, V. B.; Magnier, S.

doi:10.1016/j.jms.2005.08.001

Cited by 25 publications

(11 citation statements)

References 39 publications

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“…5, similar to that described in Ref. 28, we have obtained a primary Fermi contact constant, b F = 65± 10 MHz. This is in good agreement with 1 / 4 of the atomic potassium ground state Fermi contact constant ͓͑1/4͒231.54Ϸ 58 MHz͔.…”

Section: Fine and Hyperfine Structuresupporting

confidence: 86%

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The K239 2Σg+3 state: Observation and analysis

Xie

et al. 2007

The Journal of Chemical Physics

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The (39)K(2) 2 (3)Sigma(g) (+) state has been observed by perturbation-facilitated infrared-infrared double resonance spectroscopy and two-photon excitation. Resolved fluorescence spectra into the a (3)Sigma(u) (+) state have been recorded. The observed vibrational levels have been assigned as the v=23-25, 27, 28, 31-33, 38-45, 47, and 53 levels by comparing the observed and calculated spectra of the 2 (3)Sigma(g) (+)-->a (3)Sigma(u) (+) transitions. Molecular constants have been obtained using a global fitting procedure with a comprehensive set of experimental data. Fine and hyperfine splittings have been resolved in the excitation spectra. Perturbations between the 2 (3)Sigma(g) (+) and 2 (3)Pi(g) states were observed. The hyperfine patterns of the 2 (3)Sigma(g) (+) levels are strongly affected by the perturbation. The perturbation-free and weakly perturbed levels follow the case b(betaS) coupling scheme, while the perturbed levels follow case b(beta J) coupling. A Fermi contact constant, b(F)=65+/-10 MHz, has been obtained. Intensity anomalies of rotational lines appeared both in the 2 (3)Sigma(g) (+) approximately 2 (3)Pi(g)<--b (3)Pi(u) excitation spectra and in the 2 (3)Sigma(g) (+) approximately 2 (3)Pi(g)-->a (3)Sigma(u) (+) resolved fluorescence spectra. These intensity anomalies can be explained in terms of a quantum-mechanical interference effect.

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Section: Fine and Hyperfine Structuresupporting

confidence: 86%

“…The a 3 ⌺ u + state potential energy function has been reported in Ref. 28, and we have used this to predict rovibrational term values. From the P-R fluorescence line separation, the upper level has been determined to have rotational quantum number N = 67.…”

Section: Two-photon Transition Assignmentmentioning

confidence: 99%

The K239 2Σg+3 state: Observation and analysis

Xie

et al. 2007

The Journal of Chemical Physics

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“…The potential energy curve for the lowest triplet state is reasonably well known for many of the alkali metal dimers [53,54,55,56]. Pairwise-additive model potentials have been extensively used in theoretical studies of 3-body recombination [57,58,59,60].…”

Section: General Aspects Of Alkali Metal Dimer Collisionsmentioning

confidence: 99%

Molecular collisions in ultracold atomic gases

Hutson

Soldán

2007

International Reviews in Physical Chemistry

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It has recently become possible to form molecules in ultracold gases of trapped alkali metal atoms. Once formed, the molecules may undergo elastic, inelastic and reactive collisions. Inelastic and reactive collisions are particularly important because they release kinetic energy and eject atoms and molecules from the trap. The theory needed to handle such collisions is presented and recent quantum dynamics calculations on ultracold atom-diatom collisions of spin-polarised Li + Li2, Na + Na2 and K + K2 are described. All these systems have potential energy surfaces on which barrierless atom exchange reactions can occur, and both inelastic and reactive rates are very fast (typically k inel > 10 −10 cm 3 s −1 in the Wigner regime).

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“…The quality of these predictions was confirmed later by some new experimental investigations on excited states, mainly triplet states. [24][25][26][27][28][29][30][31] Our previous studies of the electronic structure of K 2 were performed under the assumption that spin-orbit effects could be neglected for this not too heavy alkali dimer. Nevertheless, including these effects should lead to a more precise description of the electronic structure of K 2 .…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of the Ωg,u(+/−) states of K2 dissociating adiabatically up to K(4p P23/2)+K(4p P23/2)

Jraij

Allouche

Magnier

et al. 2009

The Journal of Chemical Physics

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A theoretical investigation of the electronic structure of the K(2) molecule, including spin-orbit effects, has been performed. Potential energies have been calculated over a large range of R up to 75a(0) for the 88 Omega(g,u)(+/-) states dissociating adiabatically into the limits up to K(4p (2)P(3/2))+K(4p (2)P(3/2)). Equilibrium distances, transition energies, harmonic frequencies, as well as depths for wells and heights for barriers are reported for all of the bound Omega(g,u)(+/-) states. Present ab initio calculations are shown to be able to reproduce quite accurately the small structures (wells and barrier) displayed at very long-range (R>50a(0)) by the (2,3)1(u) and (2)0(g)(-) purely long-range states. As the present data could help experimentalists, we make available extensive tables of energy values versus internuclear distances in our database at the web address http://www-lasim.univ-lyon1.fr/spip.php?rubrique99.

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New experimental data on the K2 state analyzed with the multi-parameter approach

Cited by 25 publications

References 39 publications

The K239 2Σg+3 state: Observation and analysis

The K239 2Σg+3 state: Observation and analysis

Molecular collisions in ultracold atomic gases

Theoretical investigation of the Ωg,u(+/−) states of K2 dissociating adiabatically up to K(4p P23/2)+K(4p P23/2)

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