Coherence, atomic

Shore B. W. The Theory of Coherent Atomic Excitation, Vol. 2 (John Wiley, New York) (1990). 

N. V. Vitanov, K.-A. Suominen, and B. W. Shore. Creation of coherent atomic superpositions by fractional stimulated Raman adiabatic passage. J. Phys. B, 32(18) 4535 546 (1999). 

In this section we discuss the bound states of the hydrogen atom. These are states where the electron stays with the nucleus. In contrast, an electron with lots of energy could simply speed past the nucleus without getting trapped. Such an unbound electron does not stop long enough form a coherent atom hence in our study of the atom, it makes sense to study only the bound states. 

Although the Greek philosophers Democritus (460-370 Bc) and Epicurus (341-270 Bc) presented views of nature that included atoms, many hundreds of years passed before experimental studies could establish the quantitative relationships needed for a coherent atomic theory. In 1808, John Dalton published A New System of Chemical Philosophy in which he proposed that... 

Shore BW (1990) The theory of coherent atomic excitation, p. 194, New York, John Wiley Sons... 

TOWARDS QUANTUM CONTROL OF LIGHT SHAPING QUANTUM PULSES OF LIGHT VIA COHERENT ATOMIC MEMORY... 

We consider the NMOR in coherent atomic media, where the basic mechanism of NMOR is the laser-induced coherence between the Zeeman sublevels of atomic ground state and, hence, the detected NFS is sensitive to the damping rate of atomic coherence. An atomic transition is chosen such that both A- and M-systems are created. Under usual conditions, the contributions of these systems to the Faraday signal cannot be separated, because their manifestations are similar. On the other hand, it is well known that for a given state the highest order atomic coherence is uniquely associated with the atomic polarization moment (PM) of the same order. This means that if we are able to detect the NMOR signal separately from different PM, the corresponding atomic coher-... 

In the near future, experiments which allow for direct observation of coherent atomic motion in (photo-)chemical reactions, will be carried out [6]. Thus, realtime filming of atomic motions via time-resolved X-ray diffraction should become reality. 

Shore, B. W The Theory of Coherent Atomic Excitation Simple Atoms and Fields Wilev Sons New York, 1990 Vol. 1. 

P. Marte, P. ZoUer, J.L. HaU, Coherent atomic mirrors and beam splitters by adiabatic passage in multilevel systems, Phys. Rev. A 44 (1991) 4118. 

From the birthday of the modem chemistry, i.e., since Boyle had used for the first time a coherent atomic theory in science in his 1661 famous book The Skeptical Chymist, the fundamental principles and concepts of matter stmcture were constantly shared by the physics and chemistry. However, the divorce of chemistry from physics would have to come with many occasions by means of classical chemical concepts, e g., valence, chemical bond, and electronegativity. The mystery by which the atoms are kept together and still preserving their intimate properties was searched by great minds, from Newton to Lewis, being the key furnished only with the advent of quantum theory. Within this new paradigm of matter there is the feeling that the physics and chemistry are united under the actual common... 

Fig. 9.38 Interferometric signal of the superposition of two coherent atom lasers as a function of the time delay...

It could be proved that the superposition of two coherent atom laser beams which were released from two separate atomic traps results in interference structures similar to the superposition of coherent light waves [1179]. In Eig. 9.38 the total intensity of the superimposed two beams from two different EEC traps is shown as a function of the delay time between the two beams. The active medium of the laser which acts as amplifier corresponds to the EEC of the EOSER which is the reservoir for the atom laser and acts as amplifier because nearly aU atoms in the EEC are in their ground state and feed the atom laser as long as the trapping potential is switched off. 

M. Inguscio Coherent atomic and molecular spectroscopy in the far-infrared. Rhysica Scripta 37, 699 (1988)... 

The first example is a three-level A-type system coupled by bichromatic coupling and probe fields, which opens two Raman transition channels [60]. The phase dependent interference between the resonant two-photon Raman transitions depends on the relative phases of the laser fields either constructive interference or destructive interference between the two Raman channels can be obtained by controlling the laser phases. The second example is a four-level system coupled by two coupling fields and two probe fields, in which a double-ElT configuration is created by the phase-dependent interference between the three-photon and one-photon excitation processes, or equivalently two independent Raman transition channels [58,62]. We will provide theoretical analyses of the phase dependent quantum interference in the two multi-level atomic systems and present experimental results obtained with cold Rb atoms. The two systems provide basic platforms to study coherent atom-photon interactions and quantum state manipulations, and to explore useful applications of the phase-dependent interference in the multi-level atomic systems. 

S. Zibrov, M. D. Lukin, and M. 0. Scully. Nondegenerate Parametric Self-Oscillation via Multiwave Mixing in Coherent Atomic Media. Phys. Rev. Lett. 1999 November 15 83(20) 4049-4052. 

In most cases, samples are a mixture of isotopes j with different scattering length bj and it is assumed that they are randomly distributed over the sample. Such random distribution of different isotopes produces incoherent cross-section. In analogy with isotope incoherence, spin incoherence is also observed. For nuclei with spin I l, the interaction depends on the orientation between neutron and nuclear spins scattering lengths and b for parallel and untiparallel spin, respectively, are different and the orientations of spins are randomly distributed in the nuclei even if they are the same kinds of nuclei. Then, incoherent and coherent atomic cross-sections are given by... 

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