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BL
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| Record Number
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862271
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| Main Entry
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Guttridge, Alexander
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| Title & Author
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Photoassociation of ultracold CsYb molecules and determination of interspecies scattering lengths /\ Alexander Guttridge.
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| Publication Statement
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Cham, Switzerland :: Springer,, [2019]
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| Series Statement
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Springer theses
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| Page. NO
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1 online resource :: illustrations
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| ISBN
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3030212017
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: 3030212025
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: 3030212033
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: 9783030212018
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: 9783030212025
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: 9783030212032
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3030212009
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9783030212001
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| Notes
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Doctoral thesis accepted by the Durham University, Durham, UK.
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| Bibliographies/Indexes
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Includes bibliographical references.
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| Contents
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Intro; Supervisor's Foreword; Abstract; Publications Related to this Thesis; Acknowledgements; Contents; 1 Introduction; 1.1 Motivation; 1.2 Cooling Molecules; 1.2.1 Direct Cooling of Molecules; 1.2.2 Indirect Cooling of Molecules; 1.3 Why CsYb Molecules?; 1.4 Thesis Outline; 1.5 Contributions of the Author; References; 2 Routes to Ground State CsYb Molecules; 2.1 Scattering Length; 2.2 Feshbach Resonances; 2.2.1 Scattering Properties of Cs; 2.2.2 Magnetoassociation; 2.3 Feshbach Resonances in Mixtures of Alkali and Closed-Shell Atoms; 2.3.1 Ground State Atoms
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2.3.2 Metastable Atoms and Alkali Atoms2.4 Photoassociation; 2.4.1 Two-Photon Photoassociation; 2.5 STIRAP; 2.5.1 Free-Bound STIRAP; References; 3 Experimental Setup; 3.1 Atomic Properties; 3.1.1 Caesium; 3.1.2 Ytterbium; 3.2 Experimental Overview; 3.2.1 Dual-Species Oven; 3.2.2 Zeeman Slower; 3.2.3 Science Chamber; 3.3 Laser Systems for Trapping and Cooling Cs and Yb; 3.3.1 Cs Laser Systems; 3.3.2 Yb Laser Systems; 3.4 Magnetic Field Generation; 3.4.1 Zeeman Slower Coils; 3.4.2 Science Chamber; 3.5 Absorption Imaging; 3.5.1 Measuring the Density Distribution
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3.5.2 Measuring the Momentum DistributionReferences; 4 Quantum Degenerate Gases of Yb; 4.1 Optical Trapping of Yb; 4.1.1 Optical Setup; 4.1.2 Loading Yb into an Optical Trap; 4.2 Evaporative Cooling to Quantum Degeneracy; 4.2.1 Bose-Einstein Condensate of 174Yb Atoms; 4.3 Degenerate Fermi Gas of 173Yb Atoms; 4.3.1 Fermionic MOT; 4.3.2 Fermi Degeneracy in 173Yb; 4.4 Other Yb Isotopes; References; 5 A Quantum Degenerate Gas of Cs; 5.1 Cs MOT and Sub-doppler Cooling; 5.2 Degenerate Raman Sideband Cooling of Cs; 5.2.1 Degenerate Raman Sideband Cooling; 5.2.2 Observation of DRSC
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5.2.3 Optimisation of DRSC5.3 Optical Trapping of Cs; 5.3.1 Reservoir Trap; 5.3.2 Dimple Trap; 5.4 Cs2 Feshbach Resonances; 5.5 Bose-Einstein Condensate of 133Cs Atoms; References; 6 Interspecies Thermalisation in an Ultracold Mixture of Cs and Yb; 6.1 Preparation of a Mixture of Cs and Yb; 6.2 Interspecies Interactions; 6.3 Measuring the Elastic Cross Section; 6.4 Scattering Lengths of CsYb Isotopologs; References; 7 One-Photon Photoassociation; 7.1 Theory; 7.1.1 Molecular Potentials; 7.1.2 Angular Momentum Coupling in Molecules; 7.1.3 Vibration; 7.1.4 Photoassociation Transition Strengths
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7.2 Experimental Setup7.3 Photoassociation of Cs2; 7.3.1 Measurements Using a Cs MOT; 7.3.2 Optically Trapped Cs; 7.3.3 Feshbach-Enhanced Photoassociation; 7.4 Photoassociation of CsYb; 7.4.1 CsYb Photoassociation Routine; 7.4.2 Cs174Yb Photoassociation Lines; 7.4.3 CsYb Binding Energies; 7.4.4 Photoassociation of Other CsYb Isotopologs; References; 8 Two-Photon Photoassociation; 8.1 Two-Photon Photoassociation of CsYb; 8.1.1 Experimental Setup; 8.1.2 Spectroscopy Methods; 8.1.3 Binding Energy Measurements; 8.2 Line Strengths and Autler-Townes Spectroscopy
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| Abstract
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This thesis lays the groundwork for producing a new class of ultracold molecule by associating an alkali-metal atom and a closed-shell alkaline-earth-like atom, specifically Cs and Yb. Such molecules exhibit both a magnetic dipole moment and an electric dipole moment in their ground state. This extra degree of freedom opens up new avenues of research including the study of exotic states of matter, the shielding of molecular collisions and the simulation of lattice spin models. In detail, the thesis reports the first and only ultracold mixture of Cs and Yb in the world, giving details of the methods used to cool such contrasting atomic species together. Using sensitive two-colour photoassociation measurements to measure the binding energies of the near-threshold CsYb molecular levels in the electronic ground state has allowed the previously unknown scattering lengths to be accurately determined for all the Cs-Yb isotopic combinations. As part of this work, the one-photon photoassociation of ultracold Cs*Yb is also studied, yielding useful information on the excited-state potential. Knowledge of the scattering lengths enables a strategy to be devised to cool both species to quantum degeneracy and, crucially, determines the positions of interspecies Feshbach resonances required for efficient association of ground-state CsYb molecules. With these results, the prospect of bringing a new molecule into the ultracold regime has become considerably closer.
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Cesium.
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Low temperatures.
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Molecules-- Effect of low temperatures on.
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Quantum theory.
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Ytterbium.
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Cesium.
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Low temperatures.
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Quantum theory.
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SCIENCE-- Physics-- Quantum Theory.
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Ytterbium.
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| Dewey Classification
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539.7
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| LC Classification
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QC173.25
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