Gotowe bibliografie tematyczne / Atomic

Gotowa bibliografia na temat „Atomic”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 6 września 2023

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Artykuły w czasopismach na temat "Atomic"

Abdel-Khalek, S., M. S. Almalki i E. Edfawy. "Dynamical Properties of Scaled Atomic Wehrl Entropy of Multiphoton JCM in the Presence of Atomic Damping". Advances in Condensed Matter Physics 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/879058.

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We study the dynamics of the atomic inversion, scaled atomic Wehrl entropy, and marginal atomicQ-function for a single two-level atom interacting with a one-mode cavity field taking in the presence of atomic damping. We obtain the exact solution of the master equation in the interaction picture using specific initial conditions. We examine the effects of atomic damping parameter and number of multiphoton transition on the scaled atomic Wehrl entropy, atomicQ-function, and their marginal distribution. We observe an interesting monotonic relation between the different physical quantities in the case of different values of the number of photon transition during the time evolution.

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Zhuang, Wei, Yang Zhao, Shaokai Wang, Zhanjun Fang, Fang Fang i Tianchu Li. "Ultranarrow bandwidth Faraday atomic filter approaching natural linewidth based on cold atoms". Chinese Optics Letters 19, nr 3 (2021): 030201. http://dx.doi.org/10.3788/col202119.030201.

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Ţîrcă, Simona Maria, Ion Ţîrcă, Marius Sorin Ciontea i Florin Dumitru Mihălţan. "Atomic Force Microscopy Applied to Atopic Dermatitis Study". Internal Medicine 18, nr 4 (1.08.2021): 21–28. http://dx.doi.org/10.2478/inmed-2021-0171.

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Abstract Atopic dermatitis (AD)-the commonest inflammatory skin disease affects up to 25% of children and 2% to 5% of adults. Methods of the diagnostic provide expanded recommendations founded on available evidence. Morphological evaluation remains a principal feature of clinical investigation and the main criteria of diagnosis. Methods. We collected normal and affected skin from a 6-month child patient who was diagnosed through dermatologic examination. Clinical characteristics and the diagnosis of atopic dermatitis were in accordance with Hanifin and Rajka criteria. Morphology and structural integrity were investigated by Atomic Force Microscopy. Results. Optical and topography images indicate that in the case of AD skin lesions the cuticle structure was severely damaged and distorted with the flattening and grading of the plates, which have an irregular appearance. From the surface morphologies of the samples, we demonstrate that the shape of the corneocytes, with granular and elongated appearance, specific to normal skin is transformed by AD into broken and collapsed plates with discontinuous appearance. Conclusions. In the initial diagnosis of AD changes of the skin properties can be an indicator. Hanifin and Rajka criteria together with Atomic Force Microscopy can be a useful and necessary technique diagnosing cases of atopic dermatitis.

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Sokolov, Y. "Atomic agents [atomic power]". Power Engineer 20, nr 1 (2006): 18. http://dx.doi.org/10.1049/pe:20060102.

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Rong Cao, Rong Cao, Rong Wen Rong Wen, Zhenjie Gu Zhenjie Gu, Zhiguang Han Zhiguang Han, Peng Qian Peng Qian i and Jiefei Chen and Jiefei Chen. "Interfering single photons retreived from collective atomic excitations in two dense cold-atom clouds". Chinese Optics Letters 14, nr 8 (2016): 080201–80205. http://dx.doi.org/10.3788/col201614.080201.

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Slevin, J. A. "Atomic Physics: Atomic hydrogen source". Physics Bulletin 36, nr 11 (listopad 1985): 454. http://dx.doi.org/10.1088/0031-9112/36/11/010.

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Ganguly, P. "Atomic sizes and atomic properties". Journal of Physics B: Atomic, Molecular and Optical Physics 41, nr 10 (6.05.2008): 105002. http://dx.doi.org/10.1088/0953-4075/41/10/105002.

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Ganguly, Parthasarathy. "Atomic sizes from atomic interactions". Journal of Molecular Structure 930, nr 1-3 (lipiec 2009): 162–66. http://dx.doi.org/10.1016/j.molstruc.2009.05.008.

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Cabe, Patrick A. "Atomic". College Teaching 44, nr 4 (październik 1996): 149–52. http://dx.doi.org/10.1080/87567555.1996.9932345.

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Ghasemian, E., i M. K. Tavassoly. "Population dynamics of ultra-cold atoms interacting with radiation fields in the presence of inter-atomic collisions". Chinese Optics Letters 19, nr 12 (2021): 122701. http://dx.doi.org/10.3788/col202119.122701.

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Rozprawy doktorskie na temat "Atomic"

Lombardi, Pietro Ernesto. "Coherent manipulation of the internal state of an atomic gas : from atomic memories to atomic interferometers". Paris 6, 2012. http://www.theses.fr/2012PA066417.

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Ce travail de thèse est consacré à l'exploration de méthodes cohérentes pour la manipulation des états internes d'une nuage atomique. L'objectif final est de créer un schéma pour la réalisation d'une mémoire quantique capable de stocker l'état quantique d'une impulsion lumineuse dans une cohérence atomique. J'ai exploré deux différentes réalisations expérimentales, les deux basées sur la transparence induite électromagnétiquement dans un système à trois niveaux en configuration Lambda. La première réalisation est basée sur sous-niveaux Zeeman d'atomes de césium à température ambiante (réalisé dans le groupe de E. Giacobino au LKB, Paris) en s'appuyant sur la ligne D2. En présence d’élargissement Doppler l'effet EIT est fortement réduite en raison de la présence de transitions adjacentes. Nous avons développé un modèle théorique pour décrire la réponse optique du système, comprenant les contributions des transitions hors résonance. Nous avons ensuite vérifié expérimentalement le modèle et trouvé une méthode pour améliorer la transparence optique basée sur un de-pompage sélectif en vitesse. La deuxième réalisation est basée sur les états hyperfins de atomes de rubidium ultra-froids piégés dans une micro-piège magnétique (réalisé dans le groupe de F. S. Cataliotti au LENS, Firenze). Dans cette expérience, nous avons observé une forte réduction (près de 6 ordres de grandeur) de la vitesse de la lumière dans l'ensemble atomique, une étape fondamentale vers la réalisation de stockage d'information cohérente. Nous avons développé également une méthode pour mesurer la phase relative entre deux impulsions de lumière en utilisant l'interférométrie atomique
This thesis work is devoted to the exploration of coherent methods for the manipulation of atomic internal states. The final aim is to create a robust scheme for the realization of a quantum memory capable of storing the quantum state of a light pulse in an atomic coherence. I have explored two different experimental realizations, both based on electromagnetically induced transparency in a three level Lambda scheme. The first realization was based on Zeeman sub-levels of Cesium atoms in a room temperature cell (realized in the group of Elisabeth Giacobino at LKB, Paris). In this experiment we characterized a memory based on the D2 line of 133Cs. In the presence of Doppler broadening the EIT effect is strongly reduced due to the presence of adjacent transitions. We developed a model to describe the optical response of the complete system including off-resonant transitions. We then experimentally verified the model and found a method to enhance the transparency based on velocity selective optical pumping. The second realization was instead based on hyperfine states of ultracold Rubidium atoms held in a magnetic microtrap (realized in the group of F. S. Cataliotti at LENS, Firenze). In this experiment we observed a strong reduction (by almost 6 orders of magnitude) in the speed of light within the atomic sample, a promising step towards the realization of coherent information storage. We developed also a method to measure the relative phase of light pulses using atomic interferometry. These findings open an interesting alternative route for the detection of quantum coherence and non-classical states

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Grimble, Ralph Ashley. "Atomic force microscopy : atomic resolution imaging and force-distance spectroscopy". Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312277.

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Arora, Bindiya. "Modeling of atomic systems for atomic clocks and quantum information". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 159 p, 2009. http://proquest.umi.com/pqdweb?did=1654501311&sid=2&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Gajinov, Vladimir. "Atomic dataflow model". Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/284658.

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With the recent switch in the design of general purpose processors from frequency scaling of a single processor core towards increasing the number of processor cores, parallel programming became important not only for scientific programming but also for general purpose programming. This also stressed the importance of programmability of existing parallel programming models which were primarily designed for performance. It was soon recognized that new programming models are needed that will make parallel programming possible not only to experts, but to a general programming community. Transactional Memory (TM) is an example which follows this premise. It improves dramatically over any previous synchronization mechanism in terms of programmability and composability, at the price of possibly reduced performance. The main source of performance degradation in Transactional Memory is the overhead of transactional execution. Our work on parallelizing Quake game engine is a clear example of this problem. We show that Software Transactional Memory is superior in terms of programmability compared to lock based programming, but that performance is hindered due to extreme amount of overhead introduced by transactional execution. In the meantime, a significant research effort has been invested in overcoming this problem. Our approach is aimed towards improving the performance of transactional code by reducing transactional data conflicts. The idea is based on the organization of the code in which highly conflicting data is promoted to dataflow tokens that coordinate the execution of transactions. The main contribution of this thesis is Atomic Dataflow model (ADF), a new task-based parallel programming model for C/C++ that integrates dataflow abstractions into the shared memory programming model. The ADF model provides language constructs that allow a programmer to delineate a program into a set of tasks and to explicitly define data dependencies for each task. The task dependency information is conveyed to the ADF runtime system that constructs a dataflow task graph that governs the execution of a program. Additionally, the ADF model allows tasks to share data. The key idea is that computation is triggered by dataflow between tasks but that, within a task, execution occurs by making atomic updates to common mutable state. To that end, the ADF model employs transactional memory, which guarantees atomicity of shared memory updates. The second contribution of this thesis is DaSH - the first comprehensive benchmark suite for hybrid dataflow and shared memory programming models. DaSH features 11 benchmarks, each representing one of the Berkeley dwarfs that capture patterns of communication and computation common to a wide range of emerging applications. DaSH includes sequential and shared-memory implementations based on OpenMP and TBB to facilitate easy comparison between hybrid dataflow implementations and traditional shared memory implementations. We use DaSH not only to evaluate the ADF model, but to also compare it with other two hybrid dataflow models in order to identify the advantages and shortcomings of such models, and motivate further research on their characteristics. Finally, we study applicability of hybrid dataflow models for parallelization of the game engine. We show that hybrid dataflow models decrease the complexity of the parallel game engine implementation by eliminating or restructuring the explicit synchronization that is necessary in shared memory implementations. The corresponding implementations also exhibit good scalability and better speedup than the shared memory parallel implementations, especially in the case of a highly congested game world that contains a large number of game objects. Ultimately, on an eight core machine we were able to obtain 4.72x speedup compared to the sequential baseline, and to improve 49% over the lock-based parallel implementation based on work-sharing.
Con el reciente cambio en el diseño de los procesadores de propósito general pasando del aumento de frecuencia al incremento del número de núcleos, la programación paralela se ha convertido en importante no solo para la comunidad científica sino también para la programación en general. Este hecho ha enfatizado la importancia de la programabilidad de los modelos actuales de programación paralela, cuyo objetivo era el rendimiento. Pronto se observó la necesidad de nuevos modelos de programación, para hacer factible la programación paralela a toda la comunidad. Transactional Memory (TM) es un ejemplo de dicho objetivo. Supone una gran mejora sobre cualquier método anterior de sincronización en términos de programabilidad, con una posible reducción del rendimiento como coste. La razón principal de dicha degradación es el sobrecoste de la ejecución transaccional. Nuestro trabajo en la paralelización del motor del juego Quake es un claro ejemplo de este problema. Demostramos que Software Transactional Memory es superior en términos de programabilidad a los modelos de programación basados en locks, pero que el rendimiento es entorpecido por el sobrecoste introducido por TM. Mientras tanto, se ha invertido un importante esfuerzo de investigación para superar dicho problema. Nuestra solución se dirige hacia la mejora del rendimiento del código transaccional reduciendo los conflictos con la información contenida en las transacciones. La idea se basa en la organización del código en el cual la información conflictiva es promocionada a señales del flujo de datos que coordinan la ejecución de las transacciones. La contribución principal de esta tesis es Atomic Dataflow Model (ADF), un nuevo modelo de programación para C/C++ basado en tareas que integra abstracciones de flujo de datos en el modelo de programación de la memoria compartida. El modelo ADF provee construcciones del lenguaje que permiten al programador la definición del programa como un conjunto de tareas, además de la definición explícita de las dependencias de datos para cada tarea. La información de dependencia de la tarea se transmite al runtime de ADF, que construye un grafo de tareas que es el que controla la ejecución de un programa. Adicionalmente, el modelo ADF permite que las tareas compartan información. La idea principal es que la computación es activada por el flujo de datos entre tareas, pero que dentro de una tarea la ejecución ocurre haciendo actualizaciones atómicas a un estado común mutable. Para conseguir este fin, el modelo ADF utiliza TM, que garantiza la atomicidad en las modificaciones de la memoria compartida. La segunda contribución es DaSH, el primer conjunto de benchmarks para los modelos de programación de flujo de datos híbridos y los de memoria compartida. DaSH contiene 11 benchmarks, cada uno representativo de uno de los Berkeley dwarfs que captura patrones de comunicaciones y procesamiento comunes en un amplio rango de aplicaciones emergentes. DaSH incluye implementaciones secuenciales y de memoria compartida basadas en OpenMP y TBB que facilitan la comparación entre los modelos híbridos de flujo de datos e implementaciones de memoria compartida. Nosotros usamos DaSH no solo para evaluar ADF, sino también para compararlo con otros dos modelos híbridos para identificar sus ventajas. Finalmente, estudiamos la aplicabilidad de dichos modelos híbridos para la paralelización del motor del juego. Mostramos que disminuyen la complejidad de la implementación paralela, eliminando o reestructurando la sincronización explícita que es necesaria en las implementaciones de memoria compartida. También se observa una buena escalabilidad y una aceleración mejor, especialmente en el caso de un ambiente de juego muy cargado. En última instancia, sobre una máquina con ocho núcleos se ha obtenido una aceleración del 4.72x comparado con el código secuencial, y una mejora del 49% sobre la implementación paralela basada en locks.

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Monteillet, Aurélien. "Atomic Schrödinger Operator". Thesis, Uppsala University, Department of Mathematics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-121420.

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Cunningham, David. "Locking atomic sections". Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516350.

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Schef, Peter. "Weak Atomic Interactions". Doctoral thesis, Stockholm : Physics Department, Stockholm University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1064.

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Bailey, Stephen Malcolm William. "Relativistic atomic photoionization". Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387976.

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Priedeman, Jonathan Lake. "Quantifying Grain Boundary Atomic Structures Using the Smooth Overlap of Atomic Positions". BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6770.

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In this work, the relationship between grain boundary crystallography and grain boundary atomic structure is examined, using [1 0 0] - symmetric tilt grain boundaries in nickel. The structural unit model is used as a benchmark to evaluate the atomic structure description capacities of an emerging structural descriptor, the local environment representation, which itself is a refinement of the also-emergent Smooth Overlap of Atomic Positions (SOAP) descriptor. We show that the local environment representation encodes both the information of the structural unit model and additional information, such as distortion in the structural units and the arrangement of the structural units at the interface. The use of the local environment representation permits the use of a visualization tool known as SPRING to represent structural similarities between grain boundaries. With the SPRING representation, we produce objective evidence of a relationship between crystallography and atomic structure, at least for [1 0 0] - symmetric tilt grain boundaries.

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Liston, Gregory John. "The Atomic Trampoline Cavity". Thesis, University of Auckland, 1996. http://hdl.handle.net/2292/1913.

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Using an intense evanescent light wave as the lower mirror, and the gravitational force as the upper mirror, a vertical cavity for storing atoms can be constructed. Transverse confinement is obtained by totally internally reflecting the light off a concave as opposed to a planar crystal surface, which results in any atom reflected by the evanescent potential at a position away from the central axis receiving an impulse towards it. After a cursory discussion of atom optics and atomic cavities, we outline the configuration of the atomic trampoline cavity described above, and present analysis of the motion of atoms within it. A discussion of the classical dynamics and quantum modes in the cavity is given, together with other complicating factors which act as loss mechanisms out of the cavity. Various aspects of obtaining experimental realizations and applications of the cavity are considered. A detailed study of the quantum dynamics of atoms in the three dimensional cavity reveals that the dispersion can be adequately described in the transverse directions using a simulation involving a classical distribution of point-like atoms, where the probability density of finding an atom at a particular position in the simulation corresponds to the probability density of the atomic wavefunction. The classical simulations, however, significantly underestimate the spreading in the vertical direction. By calculating the modes of the atomic trampoline cavity, both in and out of the evanescent potential, the proportion of each of the modes in the excited state, and hence the decay rate, or linewidth due to spontaneous emission can be calculated. We found that even when the effect of the evanescent potential was included, the modes obtained correspond to those calculated by Wallis, Dalibard and Cohen-Tiennoudji [Appl. Phys. B 54,407 (1992)], who treated the bottom potential as infinitely steep and not exponentially decaying. In contrast to an optical Fabry-Pérot cavity, the linewidth was found to be strongly dependent on energy. Various other cavity parameters (finesse and Q) which depend on the loss due to spontaneous emission were also calculated. Using a ring cavity rather than a laser traveling wave to provide the light that totally internally reflects off the internal surface of the dielectric crystal, we can accumulate the phase change due to the single atom bouncing into and out of the evanescent wave and altering the refractive index of the cavity. A measurement of the phase of this light will reveal information about the atom. We found that the measurement did not significantly alter the mean or standard deviation of the atomic energy distribution across the modes of the cavity, as to first order the phase change of the light in the cavity is independent of the energy of the atom. The significant change in the energy distribution was the introduction of oscillations, which occurred when the phase measured was significantly different from the expected mean. The reason for these oscillations is that the measurement implies the weighting of modes just entering or leaving the evanescent wave should be increased or decreased. Ways of bringing this currently infeasible experiment closer to being achievable using novel design mechanisms are also discussed.

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Książki na temat "Atomic"

Nickle, Christopher. Civilian defense: Pre-atomic/atomic. Santa Barbara, Calif: C.A. Hansen, 1991.

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CAMRASS, ROGER. Atomic. New York: John Wiley & Sons, Ltd., 2004.

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James, Acord, Young Carey, Waller Mark, Arts Catalyst i Imperial College of Science, Technology & Medicine., red. Atomic. London: Arts Catalyst, 1998.

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ill, Viano Alexandre, i Rimetz Émilie ill, red. Atomic Betty: Atomic Betty, prof galactique. [Paris]: Jungle, 2006.

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Atomic physics. Oxford: Oxford University Press, 2005.

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Scott, Wegener, i Pattison Ronda, red. Atomic Robo: Atomic Robo y otros rarezas. Barcelona: Norma Editorial, 2011.

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Amusia, M. Ya. Atomic photoeffect. New York: Plenum, 1990.

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Goodsell, David S. Atomic Evidence. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-32510-1.

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Aono, Masakazu, red. Atomic Switch. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34875-5.

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Sauer, Frank. Atomic Anxiety. London: Palgrave Macmillan UK, 2015. http://dx.doi.org/10.1057/9781137533746.

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Części książek na temat "Atomic"

Thomas, Robert J. "Atomic Absorption and Atomic Fluorescence". W Measuring Heavy Metal Contaminants in Cannabis and Hemp, 347–59. First edition. | Boca Raton : Taylor and Francis, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9781003004158-26.

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Amusia, M. Ya. "Introduction". W Atomic Photoeffect, 1–11. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9328-4_1.

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Amusia, M. Ya. "The Structure of the Atom and Its Interaction with an Electromagnetic Field". W Atomic Photoeffect, 13–45. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9328-4_2.

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Amusia, M. Ya. "Photoabsorption in the One-Electron Approximation". W Atomic Photoeffect, 47–97. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9328-4_3.

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Amusia, M. Ya. "The Random-Phase Approximation with Exchange". W Atomic Photoeffect, 99–145. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9328-4_4.

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Amusia, M. Ya. "Results from Calculations in the Random-Phase Approximation with Exchange". W Atomic Photoeffect, 147–86. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9328-4_5.

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Amusia, M. Ya. "Generalization of the Random-Phase Approximation". W Atomic Photoeffect, 187–221. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9328-4_6.

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Amusia, M. Ya. "Improvements in Photoabsorption Theory". W Atomic Photoeffect, 223–75. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9328-4_7.

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Amusia, M. Ya. "Double-Vacancy States". W Atomic Photoeffect, 277–97. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9328-4_8.

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Amusia, M. Ya. "Conclusion". W Atomic Photoeffect, 299–303. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9328-4_9.

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Streszczenia konferencji na temat "Atomic"

Ohmukai, R., M. Hyodo, K. Nakayama, K. Kurihara i M. Watanabe. "Atomic nanofabrication using ytterbium atoms". W International Quantum Electronics Conference, 2005. IEEE, 2005. http://dx.doi.org/10.1109/iqec.2005.1560958.

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Aoyagi, Yoshinobu, Atsutoshi Doi, Sohachi Iwai i Susumu Namba. "Atomic Layer Growth of GaAs by Pulsed Laser MOVPE". W Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/msba.1987.tuc2.

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Atomic layer epitaxy has recently been interested in by many workers since the epitaxy seems to be a promising candidate for producing thin epitaxial layers and abrupt interfaces controlled in atomic scale. In this epitaxy As and Ga atoms are alternatively deposited on the GaAs substrate, layer by layer, and it is essential to realize the precise atomic layer epitaxy (SME, Stepwise Monoatomic layer Epitaxy(1)) that the deposition of Ga or As atom should be stopped automatically at the 100 % surface coverage of each atoms.

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Guet, Claude. "Atomic clusters and atomic nuclei". W Tours symposium on nuclear physics IV. AIP, 2001. http://dx.doi.org/10.1063/1.1372794.

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Wright, S. M., S. Glasgow i P. Meystre. "Theory of atomic interferometers". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fh4.

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The deflection of a stream of two-level atoms by a standing-wave light field has been studied extensively, both experimentally and theoretically, because of its potential application in the building an atomic interferometer. Such an interferometer would have the atom de Broglie wavelength as its resolution limit rather than the light wavelength, as in conventional interferometers.

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Wang, Jianyi, J. H. McGuire i R. E. Olson. "Atomic scattering from oriented Rydberg atoms". W The 19th international conference on the physics of electronic and atomic collisions. AIP, 1996. http://dx.doi.org/10.1063/1.49779.

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Li, Jianing, Swarup Das, Chang Chi Kwong, Thomas Zanon, Shau-Yu Lan i David Wilkowski. "Strontium-88 cold atomic source with double color Zeeman slower". W Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.ctup7c_02.

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We design and build up a compact Strontium atomic source based on a new scheme of double-frequency and cross polarization Zeeman slower. With the atomic flux of 2.3×109 atom/s, we aim to demonstrate inertial quantum sensing using clock transition of bosonic strontium-88 atoms.

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Pishkenari, Hossein Nejat, i Ali Meghdari. "The Atomic-Scale Hysteresis in Non Contact Atomic Force Microscopy". W ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24683.

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In this research, the hysteresis in the tip-sample interaction force in noncontact force microscopy (NC-AFM) is measured with the aid of atomistic dynamics simulations. The observed hystersis in the interaction force and displacement of the system atoms leads to the loss of energy during imaging of the sample surface. Using molecular dynamics simulations it is shown that the mechanism of the energy dissipation occurs due to bistabilities caused by atomic jumps of the surface and tip atoms in the contact region. The conducted simulations demonstrate that when a gold coated nano probe is brought close to the Au (001) surface, the tip apex atom jumps to the surface; and instantaneously, four surface atoms jump away from the surface toward the tip apex atom. Along this line, particular attention is dedicated to the dependency of the energy loss to different parameters such as the environment temperature, the tip orientation, the surface plane direction, the system size, the distance of the closest approach and the tip oscillation frequency.

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Marmet, L., i K. Hakuta. "Second harmonic generation in atomic hydrogen". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.wb4.

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Second harmonic generation (SHG) in free atoms is one of the unsolved problems in nonlinear optics. The most probable mechanism is due to Stark mixing between nearby excited states through an electric field caused by charge separation through the process of three-photon ionization. To test the mechanism, atomic hydrogen appears to be the best candidate because of its well-known electronic structure and large dipole moments of its excited states. In this work we report on the observation of SHG in atomic hydrogen in the Lyman-α region. Pulsed dye laser radiation was doubled and tuned to 243 nm for excitation of the 2s ← 1s transition at 121.6 nm by a two-photon resonance process. A cw atomic beam was used with hydrogen atoms generated in a dc discharge of H2 gas. The laser beam was focused ~1 mm below the nozzle where the hydrogen atom density was estimated to be 1013 cm−3. The second harmonic radiation was strongly enhanced by adding an external dc field of up to 10 kV/cm. Stark splitting was clearly observed at higher fields.

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Foster, Adam R., Li Ji, Hiroya Yamaguchi, Randall K. Smith i Nancy S. Brickhouse. "AtomDB: Atomic data for X-ray astronomy". W EIGHTH INTERNATIONAL CONFERENCE ON ATOMIC AND MOLECULAR DATA AND THEIR APPLICATIONS: ICAMDATA-2012. AIP, 2013. http://dx.doi.org/10.1063/1.4815861.

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Kasevich, Mark, i Steven Chu. "Atomic interferometry using stimulated Raman transitions". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.tuvv1.

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Sodium atoms prepared in hyperfine ground-state 11 > are driven to the other ground-state hyperfine level 12> when two laser beams nearly resonant with an optical transition have a frequency difference equal to the ground-state hyperfine splitting. When the two laser beams are counterpropagating, conservation of momentum between the atom and the light field requires that the atom acquire a velocity kick ~22 ħk/m during the 11> and 12> transition (~6 cm/sec in our experiment). When the lasers are detuned far from the optical transition, spontaneous emission from the intermediate optical level becomes negligible, and the atom behaves as a two-level system coupled to a resonant rf driving field. We have created an interferometer by applying a π/2-π-π/2 Raman pulse sequence: a first π/2 pulse coherently splits the atomic wave packet by putting it in a superposition of states 11> and 12>, a second π pulse occurring a time Δt later redirects each wave packet and a final π/2 pulse recombines the wave packets at time 2Δt. We have observed wave packet interference for wave packet separations of 2.4 mm and, by using the interferometer as an accelerometer, have measured the atom’s acceleration due to gravity to 3 parts in 106.

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Raporty organizacyjne na temat "Atomic"

Golding, William M. Atomic Waveguides for Atom Chips. Fort Belvoir, VA: Defense Technical Information Center, październik 2009. http://dx.doi.org/10.21236/ada508584.

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Savukov, Igor Mykhaylovych. Atomic structure calculations of complex atoms: review. Office of Scientific and Technical Information (OSTI), kwiecień 2019. http://dx.doi.org/10.2172/1511202.

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Livingston, A. E., K. Kukla i S. Cheng. Atomic physics. Office of Scientific and Technical Information (OSTI), sierpień 1995. http://dx.doi.org/10.2172/166387.

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Day, R. D., i P. E. Russell. Atomic Force Microscope. Office of Scientific and Technical Information (OSTI), grudzień 1988. http://dx.doi.org/10.2172/476627.

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Abdallah, J. Jr, R. E. H. Clark i R. D. Cowan. Theoretical atomic physics code development I: CATS: Cowan Atomic Structure Code. Office of Scientific and Technical Information (OSTI), grudzień 1988. http://dx.doi.org/10.2172/6647245.

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Hicks, Damien. Materials at Atomic Pressure. Office of Scientific and Technical Information (OSTI), czerwiec 2010. http://dx.doi.org/10.2172/1117918.

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Pennycook, S. J., D. E. Jesson, N. D. Browning i M. F. Chisholm. Microanalysis at atomic resolution. Office of Scientific and Technical Information (OSTI), czerwiec 1995. http://dx.doi.org/10.2172/81051.

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Lane, N. F. Atomic and molecular sciences. Office of Scientific and Technical Information (OSTI), grudzień 1989. http://dx.doi.org/10.2172/5026215.

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Lane, N. F. Theoretical atomic collision physics. Office of Scientific and Technical Information (OSTI), styczeń 1990. http://dx.doi.org/10.2172/6313184.

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Lane, N. F. Theoretical atomic collision physics. Office of Scientific and Technical Information (OSTI), marzec 1992. http://dx.doi.org/10.2172/5296083.

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