52 research outputs found
Interatomic potentials of van der Waals dimers and : probing discrepancies between theory and experiment
Results of new all-electron ab initio calculations and revisit of experimental studies of the interatomic potentials of lower-lying ungerade excited and ground electronic energy states of the Hg_{2} and Cd_{2} van der Waals complexes are used as probes of discrepancies between theory and experiment. From simulations of the previously and presently measured LIF excitation and dispersed emission spectra new analytical representations of the excited- and the ground-state interatomic potentials are proposed. An inverted perturbation approach was also used to improve the studied interatomic potentials. The comparison of the new ab-initio calculated potentials with the results of the analyses illustrates an improve theory-to-experiment agreement for such a demanding system like Hg_{2} or Cd_{2}
From molecular spectroscopy to entanglement of atoms : a trek with supersonic velocity
The supersonic free-jet expansion technique is being used in different fields of research in physics,
and physical chemistry to study vibrational and rotational molecular structures in ground and
excited electronic energy states. The supersonic beam technique exploits a source of monokinetic,
rotationally and vibrationally cold van der Waals (vdW) molecules that are very weakly bound in
their ground electronic states. In this article we review experiments at the Jagiellonian University
in Kraków (Poland) in which the supersonic free-jet beam serves as a source of ground-state vdW
molecules in studies of neutral-neutral interactions between 12-group metal (Me = Zn, Cd, Hg)
and 18-group noble gas (Ng = He, Ne, Ar, Kr, Xe) atoms. The experiments lead to determination
of spectroscopical characteristics and interatomic potentials of MeNg and Me2 molecules,
allowing determination of distinct trends in the Me-Ng and Me-Me interactions in different regions
of internuclear separation. The determined interatomic potentials are also used in designing
mechanisms of internal vibrational cooling of molecules photoassociated in magneto-optical traps.
Recently, versatility of supersonic beams is confirmed in quantum information where the technique
is planned to be used to create pairs of entangled atoms in experiments dedicated for testing of
Bell’s inequality for atoms. A purpose of the experiment - which is in a preparational stage in
our laboratory - is to create pairs of entangled cadmium atoms with regard to their nuclear spin
orientations. It is planned to be achieved in supersonic molecular beams of cadmium dimers using
two dye-laser pulses and stimulated Raman process leading to a controlled photodissociation of
the molecule
Spectroscopy of CdKr van der Waals complex using OODR process : new determination of the Rydberg state potential
The -state interatomic potential of CdAr in the long range region revisited : a new method for bond length adjustment
Profiles of bands recorded in excitation spectra using transition in and transitions in CdAr
High-temperature high-pressure all-metal pulsed source of van der Waals dimers : towards the Einstein-Podolsky-Rosen experiment
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