Laser Spectroscopy of Bound NaNe Molecules

Ahmad‐Bitar, Riad; Lapatovich, W. P.; Pritchard, David E.; Renhorn, Ingmar

doi:10.1103/physrevlett.39.1657

Cited by 60 publications

(17 citation statements)

References 17 publications

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“…The Ne-Na complex has been observed in excitation and emission and the ground state shows an r min at 5.2 Å with a well depth of 8 cm Ϫ1 . 43 As can be seen in Fig. 5͑b͒, this minimum would be outside the attractive wall of the Ne ϩ F Ϫ potential at 13.02 eV energy of the F* state.…”

Section: B Charge Transfer States and Pair Potentialsmentioning

confidence: 83%

Rydberg and charge transfer states of F atoms in neon matrices

Bressler

Lawrence

Schwentner

1995

The Journal of Chemical Physics

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The interaction of an electronically excited F atom with the neon matrix is investigated using absorption, excitation, and fluorescence spectroscopy. Upon vacuum ultraviolet excitation of a neon matrix doped with fluorine atoms, emissions are observed at 12.80, 13.08, and 15.48 eV. The emissions at 13.08 and 15.48 eV have a lifetime of 0.7͑0.2͒ ns and are assigned to the radiative relaxation of the 3s and 3sЈ Rydberg F atomic states. The emission at 12.80 eV has a detection limited lifetime less than 0.4 ns and is identified as emission from the Ne ϩ F Ϫ charge transfer complex. Absorption and excitation spectra of each of the observed emissions are used to identify the Rydberg absorptions of the F atoms perturbed by the neon matrix at 13. 99, 16.27, 16.49, 16.94, 17.22, and 19.02 eV. The Rydberg states belong to ns, nsЈ, and nd progressions with the same quantum defect as in the gas phase and a blueshift of the vertical ionization energies of 0.8 eV. The Stokes shift of 910 and 790 meV for the 3s and 3sЈ states and the large linewidth are attributed to a strong electron phonon coupling with Huang-Rhys factors of about 70. A two-dimensional configuration coordinate model explains the observed absorption, excitation and emission spectra, and the branching ratios of emission from Rydberg and charge transfer states.

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Section: B Charge Transfer States and Pair Potentialsmentioning

confidence: 83%

Rydberg and charge transfer states of F atoms in neon matrices

Bressler

Lawrence

Schwentner

1995

The Journal of Chemical Physics

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“…After the era of groundstate interactions, recently the interactions with an excited alkali atom as initial state have been in the focus of interest. While the groundstate interaction has been quite clearly the domain of atomic beam investigations [1][2][3][4][5][6], the excited state has been and is attacked with various techniques: measurements of line broadening [7][8][9] spectroscopic analysis of the alkali-rare gas molecules [10][11][12] and differential scattering of laser excited alkali atoms [13][14][15][16]. The evaluation of the latter data -sensitive to the adiabatic potential functions and the dynamic coupling elements -with phenomenological models for the atomic interaction becomes complicated due to the manifold of states usually involved.…”

Section: Introductionmentioning

confidence: 99%

On the interaction of excited alkali atoms with rare gas targets in scattering processes

Düren¹,

Hasselbrink²,

Moritz³

1982

Z Physik A

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A model potential calculation has been applied to evaluate scattering experiments for Na and K in the groundstate and the resonance state interacting with Ar. The model potential has only two free parameters which are determined by a best fit of the interatomic potentials to experimental results. Satisfactory agreement between calculated and experimental results is found for the differential cross sections in the groundstate and the excited state, for satellites in the K(4P), K(5P) and Na(3P) line profile, for the van der Waals constants C ~6) and C (8), the alkali ion-rare gas interaction and the vibrational energy levels of the Na-Ar molecule. As maior advantages we point out that for a given pair of atoms all these calculated data are given with one single pair of values for the free parameters and that with this set also the interatomic potentials for the higher alkali states (specifically up to 5f for Na and K) are obtained.

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“…Examples include studies of NaNe and KAr via microwave spectroscopy 22,23 , CuAr 26 , AgAr 24 , and Ag 2 Ar 27 via two-photon ionization spectroscopy, AgAr via laser-induced fluorescence excitation spectroscopy 25 , and AuRg via multiphoton ionization spectroscopy 28,29 . These studies provide valuable spectroscopic information on fine and hyperfine interactions in vdW molecules in their ground 22,23 and excited 28,29 electronic states.…”

mentioning

confidence: 99%

“…(1) In a typical molecular beam experiment, vdW clusters are produced in a supersonic expansion of M + Rg mixtures and probed via laser spectroscopy [21][22][23][24][25] . Examples include studies of NaNe and KAr via microwave spectroscopy 22,23 , CuAr 26 , AgAr 24 , and Ag 2 Ar 27 via two-photon ionization spectroscopy, AgAr via laser-induced fluorescence excitation spectroscopy 25 , and AuRg via multiphoton ionization spectroscopy 28,29 .…”

mentioning

confidence: 99%

Formation and dynamics of van der Waals molecules in buffer-gas traps

Brahms

Tscherbul

Zhang

et al. 2011

Phys. Chem. Chem. Phys.

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We show that weakly bound He-containing van der Waals molecules can be produced and magnetically trapped in buffer-gas cooling experiments, and provide a general model for the formation and dynamics of these molecules. Our analysis shows that, at typical experimental parameters, thermodynamics favors the formation of van der Waals complexes composed of a helium atom bound to most open-shell atoms and molecules, and that complex formation occurs quickly enough to ensure chemical equilibrium. For molecular pairs composed of a He atom and an S-state atom, the molecular spin is stable during formation, dissociation, and collisions, and thus these molecules can be magnetically trapped. Collisional spin relaxations are too slow to affect trap lifetimes. However, 3 He-containing complexes can change spin due to adiabatic crossings between trapped and untrapped Zeeman states, mediated by the anisotropic hyperfine interaction, causing trap loss. We provide a detailed model for Ag 3 He molecules, using ab initio calculation of Ag-He interaction potentials and spin interactions, quantum scattering theory, and direct Monte Carlo simulations to describe formation and spin relaxation in this system. The calculated rate of spin-change agrees quantitatively with experimental observations, providing indirect evidence for molecular formation in buffer-gas-cooled magnetic traps.The ability to cool and trap molecules holds great promise for new discoveries in chemistry and physics [1][2][3][4] . Cooled and trapped molecules yield long interaction times, allowing for precision measurements of molecular structure and interactions, tests of fundamental physics 5,6 , and applications in quantum information science 7 . Chemistry shows fundamentally different behavior for cold molecules 8 , and can be highly controlled based on the kinetic energy, external fields 9 , and quantum states 10 of the reactants.Experiments with cold molecules have thus far involved two classes of molecules: Feshbach molecules and deeply bound ground-state molecules. Feshbach molecules are highly vibrationally excited molecules, bound near dissociation, which interact only weakly at long range, due to small dipole moments. They are created by binding pairs of ultracold atoms using laser light (photoassociation), ac magnetic fields (rf as- . By contrast, ground-state heteronuclear molecules often have substantial dipole moments and are immune to spontaneous decay and vibrational relaxation, making these molecules more promising for applications in quantum information processing 7 and quantum simulation 11 . These molecules are either cooled from high temperatures using techniques such as buffer-gas cooling or Stark deceleration, or are created via coherent deexcitation of Feshbach molecules.This article introduces a third family to the hierarchy of trappable molecules -van der Waals (vdW) complexes. VdW molecules are bound solely by long-range dispersion interactions, leading to the weakest binding energies of any groundstate molecules, on the order of a wavenum...

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Laser Spectroscopy of Bound NaNe Molecules

Cited by 60 publications

References 17 publications

Rydberg and charge transfer states of F atoms in neon matrices

Rydberg and charge transfer states of F atoms in neon matrices

On the interaction of excited alkali atoms with rare gas targets in scattering processes

Formation and dynamics of van der Waals molecules in buffer-gas traps

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