Observation of the long-range potential well of the $\mathsf{(6)^1\Sigma^+_g(3s+5s)}$ state of Na $\mathsf{_2}$

Laue, T.; Pellegrini, Philippe; Dulieu, Olivier; Samuelis, C.; Knöckel, H.; Masnou-Seeuws, F.; Tiemann, E.

doi:10.1140/epjd/e2003-00221-7

Cited by 15 publications

(5 citation statements)

References 29 publications

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“…This feature generally produces a double-well pattern on the relevant potential curves, the inner one being related to the conventional chemical bond, while the position and depth of the outer depends on the strength of this competition. Among well-known examples are for instance the B B state in H 2 [49,50] or highly excited states of alkali dimers [51].…”

Section: What Do We Mean By a 'Molecule'?mentioning

confidence: 99%

The formation and interactions of cold and ultracold molecules: new challenges for interdisciplinary physics

2009

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Progress on researches in the field of molecules at cold and ultracold temperatures is reported in this review. It covers extensively the experimental methods to produce, detect and characterize cold and ultracold molecules including association of ultracold atoms, deceleration by external fields and kinematic cooling. Confinement of molecules in different kinds of traps is also discussed. The basic theoretical issues related to the knowledge of the molecular structure, the atom-molecule and moleculemolecule mutual interactions, and to their possible manipulation and control with external fields, are reviewed. A short discussion on the broad area of applications completes the review.

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Section: What Do We Mean By a 'Molecule'?mentioning

confidence: 99%

The formation and interactions of cold and ultracold molecules: new challenges for interdisciplinary physics

2009

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“…It was often suggested that highly excited molecules at intermediate and long range were also good candidates [53][54][55]. Alternatively, the initial state can also be a continuum state of an excited potential curve: a very interesting experiment was recently performed by the ENS 3 group in Paris [56].…”

Section: Photoassociation and Radiative Stabilizationmentioning

confidence: 99%

“…An advantage of the alkali hydrides is that due to the large dipole moment in the X Up to now, photoassociation has been used to populate bound levels in the electronic states correlating with the first excited atomic limit. It was often suggested that highly excited molecules at intermediate and long range were also good candidates [53,54,55]. Alternatively, the initial state can also be a continuum state of an excited potential curve: a very interesting experiment was recently performed by the ENS 3 group in Paris [56].…”

Section: Photoassociation and Radiative Stabilizationmentioning

confidence: 99%

Editorial: Quo vadis, cold molecules?

et al. 2004

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Abstract. We give a snapshot of the rapidly developing field of ultracold polar molecules and walk the reader through the papers appearing in this Topical Issue.PACS. 33. Molecular properties and interactions with photons -33.80.Ps Optical cooling of molecules; trapping -34. Atomic and molecular collision processes and interactions -39. Instrumentation and techniques for atomic and molecular physics

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“…Quantum chemists have taken impressive strides in the capacity to calculate molecular electronic potential curves beyond the ground state. In particular for the hydrogen and alkali dimers a large array of excited-state calculations exists including states with unusual shapes due to interactions and avoided crossings with other potentials. , However, electronic states that involve autoionization bring another range of complexity and much fewer calculations for such states exist. Some examples include the calculation of resonance parameters and quantum defects for superexcited states in molecular hydrogen, doubly excited potential curves responsible for associative ionization in Na(3p) + Na(3p) collisions, and at least a qualitative discussion of molecular potentials derived from the Na(3p) + Na(4s) pair that lie entirely in the autoionizing continuum of the Na 2 + ground state potential.…”

Section: Introductionmentioning

confidence: 99%

Dissociative Ionization of Na₂ via Repulsive Rydberg States: Elucidating Femtosecond Dynamics with Nanosecond Lasers

Chen

Hüwel

2008

J. Phys. Chem. A

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We have studied the dissociative ionization behavior of Na2 molecules using two-color, three photon optical-optical double resonance enhanced excitation via the A(1)Sigma(u)(+) and the 2(1)Pi(g) states. Excess energy ranges from about 150 to about 1500 cm(-1) above threshold for dissociative ionization into ground-state Na and Na(+). Slow atomic Na(+) fragments and Na2(+) molecular ions are detected using a linear time-of-flight spectrometer operated in low field extraction, core sampling mode. To explain the observed energy dependence of the Na(+)/Na2(+) branching ratio, we introduce a semiclassical model for the underlying decay dynamics. Franck-Condon overlap densities for bound-free transitions starting in 2(1)Pi(g) vibrational levels indicate that atomic Na(+) fragments are primarily produced via Rydberg states, with principal quantum number n between 5 and 12, converging to the repulsive 1(2)Sigma(u)(+) first excited-state potential of Na2(+). Dynamics along these Rydberg curves involves competition between electronic (autoionizing) and nuclear (dissociative) degrees of freedom. Within the model, the autoionization lifetime tau auto is the only one free parameter available to fit calculated Na(+)/Na2(+) branching ratios as a function of excess energy to the observed values. The lifetime is assumed to be the same multiple c of the Bohr period of each Rydberg potential. A chi(2)-minimization procedure yields, for the range of principal quantum numbers involved, a most likely value of c = 1.5 +/- 0.3, implying that on average the Rydberg electron completes only 1 to 2 orbits before interaction with the excited core electron leads to autoionization.

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Observation of the long-range potential well of the $\mathsf{(6)^1\Sigma^+_g(3s+5s)}$ state of Na $\mathsf{_2}$

Cited by 15 publications

References 29 publications

The formation and interactions of cold and ultracold molecules: new challenges for interdisciplinary physics

The formation and interactions of cold and ultracold molecules: new challenges for interdisciplinary physics

Editorial: Quo vadis, cold molecules?

Dissociative Ionization of Na₂ via Repulsive Rydberg States: Elucidating Femtosecond Dynamics with Nanosecond Lasers

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Observation of the long-range potential well of the $\mathsf{(6)^1\Sigma^+_g(3s+5s)}$ state of Na $\mathsf{_2}$

Cited by 15 publications

References 29 publications

The formation and interactions of cold and ultracold molecules: new challenges for interdisciplinary physics

The formation and interactions of cold and ultracold molecules: new challenges for interdisciplinary physics

Editorial: Quo vadis, cold molecules?

Dissociative Ionization of Na2 via Repulsive Rydberg States: Elucidating Femtosecond Dynamics with Nanosecond Lasers

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Dissociative Ionization of Na₂ via Repulsive Rydberg States: Elucidating Femtosecond Dynamics with Nanosecond Lasers