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Long-range Rydberg molecules, Rydberg macrodimers and Rydberg aggregates in an ultracold Cs gas
- Source :
- The European Physical Journal Special Topics. 225:2891-2918
- Publication Year :
- 2016
- Publisher :
- Springer Science and Business Media LLC, 2016.
-
Abstract
- We present an overview of our recent investigations of long-range interactions in an ultracold Cs Rydberg gas. These interactions are studied by high-resolution photoassociation spectroscopy, using excitation close to one-photon transitions into np3/2 Rydberg states with pulsed and continuous-wave ultraviolet laser radiation, and lead to the formation of long-range Cs2 molecules. We observe two types of molecular resonances. The first type originates from the correlated excitation of two atoms into Rydberg-atom-pair states interacting at long range via multipole-multipole interactions. The second type results from the interaction of one atom excited to a Rydberg state with one atom in the electronic ground state. Which type of resonances is observed in the experiments depends on the laser intensity and frequency and on the pulse sequences used to prepare the Rydberg states. We obtain insights into both types of molecular resonances by modelling the interaction potentials, using a multipole expansion of the long-range interaction for the first type of resonances and a Fermi-contact pseudo-potential for the second type of resonances. We analyse the relation of these long-range molecular resonances to molecular Rydberg states and ion-pair states, and discuss their decay channels into atomic and molecular ions. In experiments carried out with a two-colour two-photon excitation scheme, we observe a large enhancement of Rydberg-excitation probability, which we interpret as a saturable autocatalytic antiblockade phenomenon.
- Subjects :
- Physics
General Physics and Astronomy
01 natural sciences
3. Good health
010305 fluids & plasmas
symbols.namesake
13. Climate action
Excited state
0103 physical sciences
Atom
Rydberg atom
symbols
Rydberg formula
General Materials Science
Rydberg matter
Physics::Atomic Physics
Physical and Theoretical Chemistry
Rydberg state
Atomic physics
010306 general physics
Ground state
Spectroscopy
Subjects
Details
- ISSN :
- 19516401 and 19516355
- Volume :
- 225
- Database :
- OpenAIRE
- Journal :
- The European Physical Journal Special Topics
- Accession number :
- edsair.doi...........b43336d660db570c5445501555a10b09