By P.R. Berman, C.C. Lin, E. Arimondo (Eds.)
Quantity fifty four of the Advances sequence includes ten contributions, protecting a range of topic components in atomic, molecular and optical physics. the object by way of Regal and Jin experiences the houses of a Fermi degenerate gasoline of chilly potassium atoms within the crossover regime among the Bose-Einstein condensation of molecules and the condensation of fermionic atom pairs. The transition among the 2 areas might be probed by way of various an exterior magnetic box. Sherson, Julsgaard and Polzik discover the way during which mild and atoms could be entangled, with purposes to quantum details processing and verbal exchange. They file at the results of fresh experiments regarding the entanglement of far away items and quantum reminiscence of sunshine. contemporary advancements in chilly Rydberg atom physics are reviewed within the article by means of Choi, Kaufmann, Cubel-Liebisch, Reinhard, and Raithel. attention-grabbing experiments are defined during which chilly, hugely excited atoms ("Rydberg" atoms) and chilly plasmas are generated. proof for a collective excitation of Rydberg topic can also be awarded. Griffiin and Pindzola provide an account of non-perturbative quantal equipment for electron-atom scattering methods. integrated within the dialogue are the R-matrix with pseudo-states strategy and the time-dependent close-coupling procedure. an in depth evaluation of the R-matrix concept of atomic, molecular, and optical strategies is given by means of Burke, Noble, and Burke. They current a scientific improvement of the R-matrix procedure and its purposes to varied techniques comparable to electron-atom scattering, atomic photoionization, electron-molecule scattering, positron-atom scattering, and atomic/molecular multiphoton methods. Electron influence excitation of rare-gas atoms from either their flooring and metastable states is mentioned within the article by way of Boffard, Jung, Anderson, and Lin. Excitation go sections measured via the optical process are reviewed with emphasis at the actual interpretation by way of digital constitution of the objective atoms. Ozier and Moazzen-Ahmadi discover inner rotation of symmetric most sensible molecules. advancements of recent experimental tools in accordance with high-resolution torsional, vibrational, and molecular beam spectroscopy let exact choice of inner boundaries for those symmetric molecules. the topic of attosecond and angstrom technology is reviewed via Niikura and Corkum. The underlying actual mechanisms permitting one to generate attosecond radiation pulses are defined and the know-how wanted for the guidance of such pulses is mentioned. LeGouÃ«t, Bretenaker, and LorgerÃ© describe how infrequent earth ions embedded in crystals can be utilized for processing optically carried broadband radio-frequency signs. tools for achieving tens of gigahertz prompt bandwidth with submegahertz solution utilizing such units are analyzed intimately and tested experimentally. ultimately, within the article through Illing, Gauthier, and Roy, it's proven that small perturbations utilized to optical platforms can be utilized to suppress or keep watch over optical chaos, spatio-temporal dynamics, and styles. purposes of those recommendations to communications, laser stabilization, and enhancing the sensitivity of low-light optical switches are explored. Â· overseas specialists Â· complete articles Â· New advancements
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Extra resources for Advances In Atomic, Molecular, and Optical Physics, Vol. 54
Here we will discuss the case of the 40 K resonance that is used for most of our BCS-BEC crossover studies. A. S. Jin [3 F IG . 8. Behavior of the scattering length at a Feshbach resonance in 40 K between the mf = −7/2, −9/2 spin states. F IG . 9. 40 K ground state level diagram, with exaggerated Zeeman splittings. The two levels represent the hyperfine structure, which originates from the coupling of the nuclear spin (I = 4) with the electron spin (S = 1/2). Note the hyperfine structure of 40 K is inverted.
1999). Since evaporative cooling requires collisions to rethermalize the gas, a mixture of two distinguishable particles is required to cool fermions. 40 K provides an elegant solution to this problem. Figure 9 shows the ground state energy levels of 40 K. The large angular momentum of the lowest ground state hyperfine level (f = 9/2) provides 10 distinct spin states. The two highest energy states, mf = +9/2 and mf = +7/2, can both be held with reasonable spatial overlap in a magnetic trap, which is the type of trap most proven for evaporative cooling when starting from a MOT.
Jin [5 F IG . 24. Radio-frequency spectra. (a) Transition of interest. (b) rf line-shapes with (solid line) and without (dotted line) interactions (Regal and Jin, 2003). In this measurement we again used the Feshbach resonance between the mf = −5/2, −9/2 spin states. At magnetic fields near the resonance peak, the meanfield energy in the Fermi gas was measured using rf spectroscopy (Fig. 24(a)). First, optically trapped atoms were evaporatively cooled in a 72/28 mixture of the mf = −9/2 and mf = −7/2 spin states.
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