By P.R. Berman, C.C. Lin, E. Arimondo (Eds.)
Quantity fifty four of the Advances sequence comprises ten contributions, overlaying a range of topic components in atomic, molecular and optical physics. the thing by way of Regal and Jin stories 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 will be probed via various an exterior magnetic box. Sherson, Julsgaard and Polzik discover the way during which mild and atoms should be entangled, with purposes to quantum info processing and conversation. They record at the results of fresh experiments concerning the entanglement of far-off gadgets and quantum reminiscence of sunshine. fresh advancements in chilly Rydberg atom physics are reviewed within the article by way of Choi, Kaufmann, Cubel-Liebisch, Reinhard, and Raithel. interesting experiments are defined during which chilly, hugely excited atoms ("Rydberg" atoms) and chilly plasmas are generated. facts for a collective excitation of Rydberg subject can also be offered. Griffiin and Pindzola provide an account of non-perturbative quantal equipment for electron-atom scattering techniques. integrated within the dialogue are the R-matrix with pseudo-states procedure and the time-dependent close-coupling process. an in depth overview of the R-matrix thought of atomic, molecular, and optical approaches is given by way of Burke, Noble, and Burke. They current a scientific improvement of the R-matrix strategy and its purposes to varied strategies corresponding to electron-atom scattering, atomic photoionization, electron-molecule scattering, positron-atom scattering, and atomic/molecular multiphoton techniques. Electron effect excitation of rare-gas atoms from either their floor and metastable states is mentioned within the article through Boffard, Jung, Anderson, and Lin. Excitation move sections measured through the optical strategy 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 equipment according to high-resolution torsional, vibrational, and molecular beam spectroscopy permit exact selection of inner obstacles for those symmetric molecules. the topic of attosecond and angstrom technology is reviewed through Niikura and Corkum. The underlying actual mechanisms permitting one to generate attosecond radiation pulses are defined and the know-how wanted for the instruction 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 indications. equipment for attaining tens of gigahertz on the spot bandwidth with submegahertz answer utilizing such units are analyzed intimately and established experimentally. ultimately, within the article through Illing, Gauthier, and Roy, it really is proven that small perturbations utilized to optical platforms can be utilized to suppress or keep watch over optical chaos, spatio-temporal dynamics, and styles. functions of those ideas to communications, laser stabilization, and bettering the sensitivity of low-light optical switches are explored. Â· overseas specialists Â· finished articles Â· New advancements
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Extra resources for Advances In Atomic, Molecular, and Optical Physics, Vol. 54
Ref. (Pethick and of states is g( ) = 2(hω) ¯¯ 3 Smith, 2002)). The statistics of the Fermi gas are described by the Fermi–Dirac distribution function 1 , f( ) = (13) e kb T /ζ + 1 where ζ = eμ/kb T is the fugacity. We can now calculate the Fermi energy, which is defined as the energy of the highest occupied level of the potential at T = 0. We simply equate the integral over all states up to EF to the number of particles in one fermion spin state, N , to find EF h¯ ω¯ = (6N )1/3 . TF = (14) kb kb The temperature compared to TF describes the degeneracy of the Fermi gas and in the classical limit is related to peak phase space density through PSDpk = (T /TF )−3 /6.
Figure 14 plots the result of Eq. (15). In the classical regime the energy is proportional to the temperature, while in the Fermi gas limit the energy asymptotes to 34 EF ( 38 EF kinetic energy and 38 EF potential energy). Distribution functions in position and momentum can be determined through standard statistical mechanics techniques and the Thomas–Fermi approximation, which holds when many oscillator states are occupied (see Refs. (Butts and Rokhsar, 1997; DeMarco, 2001)). Table I shows the resulting Fermi–Dirac distribution functions in position and momentum space.
S. 2. A NISOTROPIC E XPANSION A disadvantage of the cross-dimensional rethermalization method is that it only provides a valid measurement of σ in the so-called collisionless regime. A trapped gas is considered collisionless if the trap oscillator period 1/ν is much shorter than the mean time between collisions in the gas, 1/Γ . In the opposite limit where Γ ν the gas is collisionally hydrodynamic and the cross-dimensional rethermalization time will be determined by the oscillator period 1/ν instead of the mean time between collisions.
Advances In Atomic, Molecular, and Optical Physics, Vol. 54 by P.R. Berman, C.C. Lin, E. Arimondo (Eds.)