By P.R. Berman, C.C. Lin, E. Arimondo (Eds.)
Quantity fifty four of the Advances sequence includes ten contributions, masking a variety of topic components in atomic, molecular and optical physics. the item by means of Regal and Jin reports 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 may be probed through various an exterior magnetic box. Sherson, Julsgaard and Polzik discover the style within which gentle and atoms may be entangled, with purposes to quantum info processing and verbal exchange. They record at the results of fresh experiments regarding the entanglement of far-off gadgets and quantum reminiscence of sunshine. contemporary advancements in chilly Rydberg atom physics are reviewed within the article via Choi, Kaufmann, Cubel-Liebisch, Reinhard, and Raithel. attention-grabbing experiments are defined within which chilly, hugely excited atoms ("Rydberg" atoms) and chilly plasmas are generated. facts for a collective excitation of Rydberg topic can also be awarded. Griffiin and Pindzola supply an account of non-perturbative quantal tools for electron-atom scattering methods. incorporated within the dialogue are the R-matrix with pseudo-states approach and the time-dependent close-coupling process. an intensive assessment of the R-matrix concept of atomic, molecular, and optical methods is given through Burke, Noble, and Burke. They current a scientific improvement of the R-matrix technique and its functions to numerous strategies corresponding to electron-atom scattering, atomic photoionization, electron-molecule scattering, positron-atom scattering, and atomic/molecular multiphoton techniques. Electron influence excitation of rare-gas atoms from either their floor and metastable states is mentioned within the article by way of Boffard, Jung, Anderson, and Lin. Excitation pass sections measured by means of the optical process are reviewed with emphasis at the actual interpretation when it comes to digital constitution of the objective atoms. Ozier and Moazzen-Ahmadi discover inner rotation of symmetric most sensible molecules. advancements of latest experimental equipment in response to high-resolution torsional, vibrational, and molecular beam spectroscopy enable exact decision of inner boundaries for those symmetric molecules. the topic of attosecond and angstrom technological know-how is reviewed by way of Niikura and Corkum. The underlying actual mechanisms permitting one to generate attosecond radiation pulses are defined and the expertise wanted for the practise 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 on the spot bandwidth with submegahertz solution utilizing such units are analyzed intimately and confirmed experimentally. ultimately, within the article by means of Illing, Gauthier, and Roy, it's proven that small perturbations utilized to optical platforms can be utilized to suppress or regulate optical chaos, spatio-temporal dynamics, and styles. purposes of those recommendations to communications, laser stabilization, and bettering the sensitivity of low-light optical switches are explored. Â· foreign specialists Â· entire articles Â· New advancements
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Extra info for Advances In Atomic, Molecular, and Optical Physics, Vol. 54
In general the expected aspect ratio in the regime between collisionless and hydrodynamic behavior is difficult to calculate. We can however check to see if some degree of hydrodynamic expansion of the normal gas is expected. We can calculate the elastic collision rate Γ = 2 n σ v in the gas, using an elastic 2 and |a | = 2000a (as was measured collision cross section given by σ = 4πa59 59 0 near the resonance peak (Regal and Jin, 2003)) to find Γ = 46 kHz. Comparing this rate to the trapping frequencies we find Γ /νr = 37 and Γ /νz = 2400.
Jin [4 F IG . 19. Dimensionless plot of the variable Tgauss (defined in the text) versus temperature. F IG . 20. Impurity spin-state thermometry. Here we plot Tgauss for all of the states in the gas for multiple experiment iterations in which T was held fixed. 13. from real images with better signal to noise than E, and it is convenient because in the classical limit it becomes precisely the real temperature of the system. In Fig. 20 we plot Tgauss as a function of N for a cold gas of atoms distributed among the three states mf = 9/2, 7/2, and 5/2.
For analysis of the impurity spin-state data in the most general case where the impurity is not fully classical, it is useful to introduce the variable Tgauss . For mσ 2 a momentum space distribution Tgauss is defined as k gauss 2 , where σgauss is the bt result from a least-squared fit to the Gaussian distribution of Eq. (17). As we saw in Fig. 15 the Fermi distributions will not be well fit by a Gaussian, but the result is a well-defined quantity. Figure 19 shows the result of Tgauss /TF as a function of degeneracy, as determined through least-squared fits to theoretical distributions.
Advances In Atomic, Molecular, and Optical Physics, Vol. 54 by P.R. Berman, C.C. Lin, E. Arimondo (Eds.)