Laser excitation of NaNe collision pairs probing the AΠ2 potential

Grimpe, A.; Großer, J.; Hoffmann, O.; Rebentrost, F.

doi:10.1063/1.1857471

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…Under the present conditions, negative detuning results in Π A 2 excitation during the collision, positive detuning in Σ + B 2 excitation, producing Na( p 3 ) atoms after the collision in both cases. Experiments [1,6] are carried out using crossed atomic and laser beams (see figure 1). Excited collision products are stabilized by transfer to a long-lived Rydberg state…”

Section: Optical Collisionsmentioning

confidence: 99%

“…We present now an extended treatment, using the complete set of spectroscopic data from [2] and a set of scattering data extended by new measurements. For the theoretical analysis, we apply a coupled states model in both cases and we expect more accurate information on the coupled system Π A 2 and Σ + B 2 correlating to + ( ) p s p Na(3 ) Ne 2 2 2 6 . We could in this way establish the assignment of reported but yet-unassigned transitions and we found corrections to the original assignments.…”

Section: Introductionmentioning

confidence: 99%

“…H rot becomes diagonal in the quantum number l for the rotation of the atom pair. For the ground state l defines the partial wave index corresponding to N in equation (6). Of course the matrix structure of the explicit expressions for H el and H so are now more complex reflecting the transformation between the two bases.…”

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confidence: 99%

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The ${{{\rm X}}^{2}}{{\Sigma }^{+}}$, ${{{\rm A}}^{2}}\Pi $ and ${{{\rm B}}^{2}}{{\Sigma }^{+}}$ potentials of NaNe from a combined analysis of optical collision and spectroscopic data

Großer

Hoffmann

Rebentrost

et al. 2014

J. Phys. B: At. Mol. Opt. Phys.

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We present new measurements of differential cross sections for the optical collision process for an extended range of optical detunings. A combined analysis of the present scattering results and the earlier NaNe laser-spectroscopic data by Lapatovich et al (1980 J. Chem. Phys. 73 5419) for optical transitions A-X and B-X is performed using a coupled channels approach in both cases. We obtain the Born–Oppenheimer potentials for the ground state and the excited states and as well as the diagonal and off-diagonal spin-orbit functions of the NaNe van der Waals molecule for a wide range of atomic distances.

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Section: Optical Collisionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The ${{{\rm X}}^{2}}{{\Sigma }^{+}}$, ${{{\rm A}}^{2}}\Pi $ and ${{{\rm B}}^{2}}{{\Sigma }^{+}}$ potentials of NaNe from a combined analysis of optical collision and spectroscopic data

Großer

Hoffmann

Rebentrost

et al. 2014

J. Phys. B: At. Mol. Opt. Phys.

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“…The dynamics of Rydberg atoms in time-dependent fields can mimic the dynamics of atomic collisions [18], e.g., laser-assisted collisions at a specific impact parameter [19,20]. Laser-assisted differential scattering cross sections are very difficult to measure in general, and only a few experimental results are available for molecular beams at thermal velocities [21]. Therefore, Rydberg systems may serve as simplified model systems in the field of atomic collisions.…”

Section: Introductionmentioning

confidence: 99%

Symmetry and symmetry breaking in Rydberg-atom intrashell dynamics

Pilskog¹,

Fregenal²,

Frette³

et al. 2011

Phys. Rev. A

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We have investigated experimentally and theoretically the dynamics of Stark-Zeeman split states in Li(n = 25) Rydberg atoms when they are exposed to a superposition of a slowly varying field and a harmonic RF field. Regular oscillatory structures are observed in the intrashell transitions. By solving the time-dependent Schrödinger equation for the problem it is shown that the dynamics is strongly influenced by the nonhydrogenic core which breaks the dynamical symmetry of the Coulomb problem. It is also shown that the dynamics effectively reduces to that of a two-level atom. The oscillations are remnants of interferences that arise partly due to a phase difference which develops between the two levels when they go through two consecutive one-photon resonances, and partly due to an effective change of the carrier-envelope phase of the coupling field.

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“…Control of the coUisional process has also been achieved [7]. Accurate tests of the interatomic potentials have been performed using the oscillatory structure seen in the differential cross sections [8]. A direct observation of nonadiabatic transitions in the exit channel of optical collisions is possible by selectively exciting an electronic state and measuring the final populations of e.g.…”

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confidence: 99%

Nonadiabatic Electron Dynamics by Direct Excitation of Collision Pairs

Rebentrost

Hoffmann

Großer³

2008

AIP Conference Proceedings

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The potential interactions in collisional systems are reflected in the observed spectral line shapes. Optical collisions corresponding to laser excitation of a collision pair are the underlying events in the wing of a spectral transition. For atomic colliders a complete quantum description is possible using the close-coupling approach [1]. Recently these methods have also been applied to collisions in highly-ionized plasmas with potential applications to diagnostic tools for plasma-and astrophysics [2]. Optical collisions have been extensively studied under thermal gas ceU conditions leading to a wealth of information on potentials, disalignment mechanisms and nonadiabatic transitions in optical coUisions. [3]. These findings are the basis for the interest in optical collisions as a method to investigate details of the collision process on a subcolhsional time scale. The principle is shown in Fig. la for the case of optical collisions in Na with the rare gas Kr. The optical coUision method is rather unique since a direct investigation of a collision by ultrashort pulse techniques does not seem feasible or requires more complex excitation schemes that have not been realized, at present. Rydberg detector pulsed nozzle excitation laser Na oven Na-Kr distance (bohr) , K^»^ detection laser Figure 1: a) Potential scheme for an optical colhsion in Na + Kr. b) The setup in a crossedbeam optical collision experimentThe study of optical collisions in a crossed-beam setup has provided new insights in the collisional process [4]. The basic experimental setup is shown in Fig. lb. Rather then using the emitted fluorescence as in thermal optical collisions, the detection of the short-lived excited alkali atoms is made by converting them into more stable Rydberg states. These are measured with high sensitivity by field-ionization.The differential detection scheme used in the crossed-beam experiments is capable to reveal the quantum nature of the scattering process. This is seen by the Stueckelberg oscillations appearing in the differential cross sections of atom-atom optical collisions. The effect is understood by the interferences of a few (mainly 2) contributing pathes to a given scattering angle.Excitation of collision pairs with polarized hght gives access to the collision geometry ("collision photography") [5,6]. Control of the coUisional process has also been achieved [7].

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Laser excitation of NaNe collision pairs probing the AΠ2 potential

Abstract: Experimental differential cross sections for the collision process Na(3s)2S+Ne+hnu-->Na(3p)2P+Ne are reported. By comparison with calculated cross sections, we are able to discriminate between different spectroscopic and quantum chemical A2Pi potentials with cm(-1) sensitivity.

Cited by 5 publications

References 8 publications

The ${{{\rm X}}^{2}}{{\Sigma }^{+}}$, ${{{\rm A}}^{2}}\Pi $ and ${{{\rm B}}^{2}}{{\Sigma }^{+}}$ potentials of NaNe from a combined analysis of optical collision and spectroscopic data

The ${{{\rm X}}^{2}}{{\Sigma }^{+}}$, ${{{\rm A}}^{2}}\Pi $ and ${{{\rm B}}^{2}}{{\Sigma }^{+}}$ potentials of NaNe from a combined analysis of optical collision and spectroscopic data

Symmetry and symmetry breaking in Rydberg-atom intrashell dynamics

Nonadiabatic Electron Dynamics by Direct Excitation of Collision Pairs

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