Photo-association spectroscopy of Rb2 molecules
Bruno VIARIS DE LESEGNO, Laurence PRUVOST
A pair of cold atoms is excited by a laser, creating an excited Rb2 long-range molecule. Trap loss spectroscopy is applied to detect weakly bound states of the excited molecule. The resonance analysis allows to describe the dipole-dipole interaction of such a molecule. The Lu-Fano method is applied in the context of Le Roy-Bernstein theory and gives quantitative results. 0g-, 0u+ and 1g series have been investigated.
A laser beam excites a pair of atoms to an molecular excited state Rb(5s)-Rb(5p). Such a molecule rapidly decays to fast atoms or to a cold molecule. Because the product is no more trapped, trap loss is recorded. The photo-association spectrum is obtained by scanning the laser wavelength.
Mettre un spectre de PA
Close to the dissociation limit, the molecular states are described by a long range potential, namely the dipole-dipole interaction. The first term is :
V(R) = -cn/Rn, n=6 for 0-g and n=3 for 0u+ and 1g.
The Le Roy-Bernstein formula, giving the binding energy of the vibrationnal level v,
by ε = εn (vD_v)(n-2)/2n can be applied.
Lu-Fano method and Le-Roy-Bernstein formula
In the case of molecular series weakly perturbed or weakly coupled to another one, the Lu-Fano method coupled with the Le Roy Bernstein formula allows to characterize the effects of the short range potential or to quantify the coupling with a small set of parameters.
Short range effects: Photoassociation spectroscopy .. 0g- H. Jelassi, B. Viaris de Lesegno, L. Pruvost, Phys. Rev. A 73, 032501, 2006
Coupling between two series and pre-dissociation: Photoassociation spectroscopy of 87Rb2 (5s1/2+5p1/2)0u+long range molecular states: coupling with the 87Rb2 (5s1/2+5p3/2)0u+series analysed using the Lu-Fano approach, H. Jelassi, B. Viaris de Lesegno, L. Pruvost, Phys. Rev. A 74, 012510, 2006
In the same section :
- Holographic method/algorithms
- Lu-Fano method and Le-Roy-Bernstein formula
- SLM, other uses
- Phase-only optically addressed Liquid Crystal SLM
- SLM generalities
- Intensity modulation
- Generalised phase contrast method
- Atom optics using shaped laser beams
- Laser beam shaping
- Fast switching AOM/SLM device
- Short range effects in the long range (5s1/2-5p1/2)0g- molecular states analysed by the Lu-Fano method
- Spin-orbit coupling between (5s1/2-5p1/2)0u+and (5s1/2-5p3/2)0u+ states highlighted by the Lu-Fano method
- Past results
- Stages and PhD proposals