Düsseldorf 2007 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 13: Poster I - Ultra-cold plasmas and Rydberg systems
A 13.3: Poster
Dienstag, 20. März 2007, 16:30–18:30, Poster B
Signatures of ultra-long-range Rydberg Molecules in photoassociation — •Ivan Liu and Jan-Michael Rost — Max-Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, D-01187, Dresden
The formation of ultra-long-range molecules was predicted in 2000 [1], involving a highly-excited (Rydberg) atom and a nearby ground-state atom. The adiabatic curves exhibit global minima at approximately 1.5n2, where n is the principle quantum number of the Rydberg atom, suggesting the enormous size of this dimer. The polyatomic Rydberg molecules have also been predicted [2]. Recently, some features of this molecular curve have been observed in the old experimental data [3]. Yet the direct evidence of the formed bound dimer is still lacking, largely due to the need to understand the photoassociative process.
Using the simplest excitation scheme in an ultracold Rb gas with realistic parameters, we reveal the signatures of such Rydberg molecules. They enter through the characteristic line shape of the free-bound molecular resonance, which was calculated numerically, thereby confirms the experimental realizability. Moreover, the important informations such as the rate of the formation and the life time of the molecules are obtained. They are both of fundamental interest and useful for the delicate quantum engineering of ultra-long-range molecules.
[1]Greene et al PRL 85, 2458 (2000)
[2]Liu and Rost EPJD 40, 65 (2006)
[3]Greene et al PRL 97, 233002 (2006)