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  • 2015-2019  (37)
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  • 1
    Online Resource
    Online Resource
    Cham :Springer International Publishing AG,
    Keywords: Polarization (Nuclear physics). ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (414 pages)
    Edition: 2nd ed.
    ISBN: 9783319552163
    Series Statement: Springer Series on Atomic, Optical, and Plasma Physics Series ; v.96
    DDC: 539.757
    Language: English
    Note: Intro -- Foreword to the Second Edition -- Foreword to the First Edition -- Preface to the Second Edition -- Preface to the First Edition -- Acknowledgements -- Contents -- Notation -- Basic Concepts -- 1 Introduction -- 1.1 Motivation -- 1.2 Historical Perspective -- 1.3 Modern Approaches -- References -- 2 Polarized Light -- 2.1 Polarization of Coherent Electromagnetic Radiation -- 2.1.1 Maxwell's Theory of Electromagnetic Radiation -- 2.1.2 The Polarization Ellipse -- 2.1.3 Parameterization of Polarization: Stokes Vectors -- 2.1.4 The Principal Frame -- 2.1.5 The Poincaré Sphere -- 2.2 Electric Dipole Radiation from Atomic Transitions -- 2.2.1 Coordinate Frames, Scattering Amplitudes, and Stokes Parameters -- 2.2.2 Atomic State Parameters, Electron Charge Clouds, and Their Experimental Determination -- 2.2.3 The Incoherent Case with Conservation of Atomic Reflection Symmetry -- 2.2.4 The Incoherent Case Without Conservation of Atomic Reflection Symmetry -- 2.2.5 Summary of Parameterization for P-State Excitation -- 2.2.6 Extension to Coherently Excited Stark Manifolds -- References -- 3 Polarized Electrons -- 3.1 The Dirac Equation -- 3.2 Pure Spin States: State Vector Description -- 3.3 Mixed Spin States: Density Matrix Description -- 3.4 Experimental Determination of Electron Polarization -- References -- 4 Experimental Geometries and Approaches -- 4.1 Integrated Cross Sections and Alignment -- 4.1.1 Schematic Setup for Angle-Integrated Measurements -- 4.1.2 Setups with Results for Electron Impact and Atom Impact Excitation -- 4.2 Differential Cross Sections -- 4.2.1 Schematic Setups for Angle-Differential Measurements -- 4.2.2 A Setup with Results for Electron--Atom Collisions -- 4.2.3 The Magnetic Angle Changer -- 4.2.4 Setups with Results for Electron Impact Ionization -- 4.2.5 A Setup with Results for Atom Impact Excitation. , 4.3 Planar Scattering Symmetry: Alignment and Orientation Parameters -- 4.3.1 Schematic Setups for Coherence and Correlation Analysis -- 4.3.2 Setups with Results for Electron Impact Excitation and De-excitation -- 4.3.3 Setups with Results for Atom Impact Excitation -- 4.4 Generalized STU Parameters for Electron Collisions -- 4.5 Generalized Stokes Parameters for Electron--Atom Collisions -- 4.6 Atom--Atom Collisions with Laser-Prepared Targets -- References -- 5 Density Matrices: Connection Between Experiment and Theory -- 5.1 Motivation -- 5.2 Scattering Amplitudes -- 5.2.1 Scattering Amplitudes in Different Coordinate Frames -- 5.2.2 Symmetry Properties -- 5.2.3 Scattering Amplitudes in the Non-relativistic Limit -- 5.3 Density Matrices -- 5.4 An Explicit Example: Generalized STU Parameters -- 5.4.1 Definition in Terms of Scattering Amplitudes -- 5.4.2 Exact Symmetry Relationships -- 5.4.3 An Approximate Symmetry: The Fine-Structure Effect -- 5.5 Irreducible Tensor Operators and State Multipoles -- 5.5.1 Basic Definitions -- 5.5.2 Coupled Systems -- 5.5.3 Time Evolution of State Multipoles: Quantum Beats -- 5.5.4 Time Integration over Quantum Beats -- 5.6 Stokes Parameters -- 5.7 Atomic and Photon Density Matrices for P-State Excitation -- References -- 6 Computational Methods -- 6.1 Electron Versus Heavy-Particle Impact -- 6.2 Computational Methods for Electron Scattering -- 6.2.1 Potential Scattering -- 6.2.2 Perturbation Approaches -- 6.2.3 The Close-Coupling Expansion -- 6.2.4 Time-Dependent Approaches -- 6.2.5 Recent Developments -- 6.3 Computational Methods for Heavy-Particle Collisions -- 6.3.1 Semi-classical Approaches -- 6.3.2 Classical-Trajectory Monte-Carlo Approach -- 6.4 Visualization of Charge Clouds -- References -- Case Studies -- 7 Electron Impact Excitation -- 7.1 Angle-Integrated Stokes Parameters and Cross Sections. , 7.1.1 Excitation of the (6s6p) States in Hg -- 7.1.2 Excitation of Ions: Cd+(2P3/2) -- 7.1.3 An Unresolved Mystery: Electron Impact Excitation of (4s5s)3S1 in Zn and (6s7s)3S1 in Hg -- 7.2 Angle-Differential Stokes and STU Parameters -- 7.2.1 Electron Impact Excitation of Helium -- 7.2.2 Electron Impact Excitation of Hydrogen, Lithium, and Sodium -- 7.2.3 Electron Impact Excitation of Heavy Noble Gases -- 7.2.4 Electron Impact Excitation of Mercury -- 7.2.5 Elastic Electron Scattering from Cesium -- 7.2.6 Recent Developments in Electron Scattering from Cesium -- 7.3 Conclusions -- References -- 8 Ion and Atom Impact Excitation -- 8.1 Angle-Differential S rightarrow P, D Excitation and Transfer -- 8.1.1 S rightarrow P, D Excitation in Mg+- and Li-Rare-Gas Systems -- 8.1.2 S rightarrow P Transfer Excitation in B3+-He, Ne Collisions -- 8.1.3 S rightarrow P Transfer in Small-Angle H+, Li+-Na(3s) Collisions -- 8.1.4 Vortex Formation in Antiproton-Atomic-Hydrogen Collisions -- 8.2 Angle-Integrated Alignment Studies Using Optically Prepared Targets -- 8.2.1 Alignment Effects in H+, Li+-Na(3p) Collisions -- 8.2.2 Alignment Effects in He2+-Na(3p) Collisions -- 8.3 Angle-Differential Studies Using Optically Prepared Targets -- 8.3.1 Level Populations in H+-Na(3p)rightarrowH(n=2,3)-Na+ Scattering -- 8.3.2 Level Populations in Li+-Na(3p)rightarrowLi(2p)-Na+ Scattering -- 8.3.3 Level Populations in He+ - Na(3p)rightarrowHe(2p)-Na+ Scattering -- 8.4 Angle-Differential Studies Using Optically Prepared -- 8.4.1 H+-Na(3p)rightarrowH (2p)-Na+ Scattering Experiments -- 8.4.2 Li+-Na(3p)rightarrowLi(2p)--Na+ Scattering Experiments -- 8.5 Reaction Microscope Studies: COLTRIMS with Alkali MOTs -- 8.5.1 Li+ Capture from a Na (3s, 3p) MOT -- 8.5.2 Na+ Capture from a Rb (5p) MOT -- References -- 9 Propensity Rules. , 9.1 Orientation for S to P Impact Excitation by Electrons and Positrons -- 9.2 Orientation for S to P Impact Excitation by Protons and Antiprotons -- 9.3 Orientation for Excitation and De-Excitation by Electrons and Positrons -- 9.4 Principal Quantum Number Dependence of Orientation and Alignment Parameters -- 9.5 Spin-Dependent Propensities -- 9.6 Validity Limits of Propensity Rules -- 9.6.1 Electron Impact Excitation of Neon -- 9.6.2 Electron Impact Excitation of He(1s3d)1D -- References -- 10 Impact Ionization -- 10.1 Ionization by Electron Impact -- 10.1.1 Angle-Integrated Studies -- 10.1.2 Angle-Differential Studies -- 10.1.3 Selected Developments Since 2001 -- 10.2 Ionization by Heavy-Particle Impact: Reaction Microscope Studies with Optically Prepared Targets -- 10.3 Ionization with Excitation by Heavy-Particle Impact -- 10.3.1 Angle-Integrated Studies -- 10.3.2 Angle-Differential Studies -- References -- 11 Photo-Driven Processes -- 11.1 Introductory Remarks -- 11.2 Photoionization by Continuous Radiation -- 11.3 Photoionization by Short-Pulse Radiation -- References -- 12 Related Topics and Applications -- 12.1 Spin-Polarized Auger Electrons -- 12.2 Autoionization Anisotropies in Heavy-Particle Collisions -- 12.3 Collisions with Molecules -- 12.3.1 Electron Collisions with Molecules -- 12.3.2 Heavy-Particle Collisions with Molecules -- 12.4 Collisions with Surfaces and Foils -- 12.5 Polarization in Collisional Broadening and Redistribution -- 12.6 Alignment and Orientation Studies at Thermal Energies -- 12.6.1 Alignment Studies Involving an Optically Prepared Atom -- 12.6.2 Alignment and Orientation Studies Involving Two Optically Prepared Atoms -- 12.7 Plasma Polarization Spectroscopy -- 12.8 Spin-Polarized Beams for Nuclear and Particle Physics -- 12.9 Quantum Entanglement and Bell Correlation in Electron-Exchange Collisions. , References -- Selection of Historical Papers (1925-1976) -- 13 Introductory Summaries -- Appendix Further Readings -- Index.
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  • 2
    Publication Date: 2019-09-23
    Description: Highlights • Stratigraphic framework over the Miocene-Pliocene boundary at IODP Site U1387. • Abrupt sedimentary changes over the Miocene-Pliocene boundary. • Clear hints for onset of Mediterranean Outflow after the Messinian Salinity Crisis. • Evidence of bottom water currents in contouritic sedimentation and elevated Zr/Al. • Quiet, hemipelagic sediment deposition during the Messinian in the Gulf of Cadiz. Abstract Integrated Ocean Drilling Program (IODP) Expedition 339 cored multiple sites in the Gulf of Cadiz in order to study contourite deposition resulting from Mediterranean Outflow water (MOW). One hole, U1387C, was cored to a depth of 865.6 meters below seafloor (mbsf) with the goal of recovering the Latest Miocene to Pliocene transition in order to evaluate the history of MOW immediately after the end of the Messinian Salinity Crisis. To understand this history, an accurate age model for the succession is needed, but is challenging to construct, because the Miocene-Pliocene boundary is not marked by a clear biostratigraphic event in the Atlantic and coring gaps occur within the recovered stratigraphic record. These limitations are overcome by combining a variety of chronostratigraphic datasets to construct an age-model that fits the currently available age indicators and demonstrates that coring in Hole U1387C did indeed recover the Miocene-Pliocene boundary at around 826 mbsf. This boundary is associated with a distinct and abrupt change in depositional environment. During the latest Messinian, hemipelagic sediments exhibiting precession-induced climate variability were deposited. These are overlain by Pliocene sediments deposited at a much higher sedimentation rate, with much higher and more variable XRF-scanning Zr/Al ratios than the underlying sediment, and that show evidence of winnowing, particle sorting and increasing grain size, which we interpret to be related to the increasing flow of MOW. Pliocene sedimentary cyclicity is clearly visible in both the benthic δ18O record and the Zr/Al data and is probably also precessionally controlled. Two contouritic bigradational sandy-beds are revealed above the third sedimentary cycle of the Pliocene. On the basis of these results, we conclude that sedimentation associated with weak Mediterranean-Atlantic exchange, began in the Gulf of Cadiz virtually at or shortly after the Miocene-Pliocene boundary.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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  • 3
    Publication Date: 2021-04-21
    Description: The stable carbon isotope composition of dissolved inorganic carbon (δ13C-DIC) can be used to quantify fluxes within the carbon system. For example, knowing the δ13C signature of the inorganic carbon pool can help in describing the amount of anthropogenic carbon in the water column. The measurements can also be used for evaluating modeled carbon fluxes, for making basin-wide estimates of anthropogenic carbon, and for studying seasonal and interannual variability or decadal trends in interior ocean biogeochemistry. For all these purposes, it is not only important to have a sufficient amount of data, but these data must also be internally consistent and of high quality. In this study, we present a δ13C-DIC dataset for the North Atlantic which has undergone secondary quality control. The data originate from oceanographic research cruises between 1981 and 2014. During a primary quality control step based on simple range tests, obviously bad data were flagged. In a second quality control step, biases between measurements from different cruises were quantified through a crossover analysis using nearby data of the respective cruises, and values of biased cruises were adjusted in the data product. The crossover analysis was possible for 24 of the 32 cruises in our dataset, and adjustments were applied to 11 cruises. The internal accuracy of this dataset is 0.017 ‰.
    Type: Article , PeerReviewed
    Format: text
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  • 4
    Publication Date: 2022-01-31
    Description: A significant reduction in the Atlantic Meridional Overturning Circulation and rapid northern Hemisphere cooling 8200 years ago have been linked to the final melting of the Laurentide Ice Sheet. Although many studies associated this cold event with the drainage of Lake Agassiz-Ojibway, recent model simulations have shown that the Hudson Bay Ice Saddle collapse would have had much larger effects on the Atlantic Meridional Overturning Circulation than the lake outburst itself. Based on a combination of Mg/Ca and oxygen isotope ratios of benthic foraminifera, this study presents the first direct evidence of a major Labrador shelfwater freshening at 8.5 ka BP, which we associate with the Hudson Bay Ice Saddle collapse. The freshening is preceded by a subsurface warming of the western Labrador Sea, which we link to the strengthening of the West Greenland Current that could concurrently have accelerated the ice saddle collapse in Hudson Bay.
    Type: Article , PeerReviewed
    Format: text
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  • 5
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    PANGAEA
    In:  Supplement to: Sadatzki, Henrik; Sarnthein, Michael; Andersen, Nils (2015): Changes in monsoon-driven upwelling in the South China Sea over glacial Terminations I and II: a multi-proxy record. International Journal of Earth Sciences, https://doi.org/10.1007/s00531-015-1227-6
    Publication Date: 2023-01-13
    Description: Upwelling intensity in the South China Sea has changed over glacial-interglacial cycles in response to orbital-scale changes in the East Asian Monsoon. Here, we evaluate new multi-proxy records of two sediment cores from the north-eastern South China Sea to uncover millennial-scale changes in winter monsoondriven upwelling over glacial Terminations I and II. On the basis of U/Th-based speleothem chronology, we compare these changes with sediment records of summer monsoondriven upwelling east of South Vietnam. Ocean upwelling is traced by reduced (UK'37-based) temperature and increased nutrient and productivity estimates of sea surface water (d13C on planktic foraminifera, accumulation rates of alkenones, chlorins, and total organic carbon). Accordingly, strong winter upwelling occurred north-west of Luzon (Philippines) during late Marine Isotope Stage 6.2, Heinrich (HS) and Greenland stadials (GS) HS-11, GS-26, GS-25, HS-1, and the Younger Dryas. During these stadials, summer upwelling decreased off South Vietnam and sea surface salinity reached a maximum suggesting a drop in monsoon rains, concurrent with speleothem records of aridity in China. In harmony with a stadial-to-interstadial see-saw pattern, winter upwelling off Luzon in turn was weak during interstadials, in particular those of glacial Terminations I and II, when summer upwelling culminated east of South Vietnam. Most likely, this upwelling terminated widespread deep-water stratification, coeval with the deglacial rise in atmospheric CO2. Yet, a synchronous maximum in precipitation fostered estuarine overturning circulation in the South China Sea, in particular as long as the Borneo Strait was closed when sea level dropped below -40 m.
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 6
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    Unknown
    PANGAEA
    In:  Supplement to: Lübbers, Julia; Kuhnt, Wolfgang; Holbourn, Ann E; Bolton, Clara T; Gray, Emmeline; Usui, Yoichi; Kochhann, Karlos Guilherme Diemer; Beil, Sebastian; Andersen, Nils (2019): The Middle to Late Miocene "Carbonate Crash" in the Equatorial Indian Ocean. Paleoceanography and Paleoclimatology, 34(5), 813-832, https://doi.org/10.1029/2018PA003482
    Publication Date: 2023-02-24
    Description: We integrate benthic foraminiferal stable isotopes, X-ray fluorescence elemental ratios, and carbonate accumulation estimates in a continuous sedimentary archive recovered at International Ocean Discovery Program Site U1443 (Ninetyeast Ridge, Indian Ocean) to reconstruct changes in carbonate deposition and climate evolution over the interval 13.5 to 8.2 million years ago. Declining carbonate percentages together with a marked decrease in carbonate accumulation rates after ~13.2 Ma signal the onset of a prolonged episode of reduced carbonate deposition. This extended phase, which lasted until ~8.7 Ma, coincides with the middle to late Miocene Carbonate Crash, originally identified in the eastern equatorial Pacific Ocean and the Caribbean Sea. Inter-ocean comparison reveals that intense carbonate impoverishment at Site U1443 (~11.5 to ~10 Ma) coincides with prolonged episodes of reduced carbonate deposition in all major tropical ocean basins. This implies that global changes in the intensity of chemical weathering and riverine input of calcium and carbonate ions into the ocean reservoir were instrumental in driving the Carbonate Crash. An increase in U1443 Log(Ba/Ti) together with a change in sediment color from red to green indicate a rise in organic export flux to the sea floor after ~11.2 Ma, which predates the global onset of the Biogenic Bloom. This early rise in export flux from biological production may have been linked to increased advection of nutrients and intensification of upper ocean mixing, associated with changes in the seasonality and intensity of the Indian Monsoon.
    Keywords: Carbonate Crash; Indian Ocean; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; stable carbon isotopes; stable oxygen isotopes; XRF
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 7
    Publication Date: 2023-06-27
    Keywords: AGE; AMOCINT, IMAGES XVII; Azores; CALYPSO; Calypso Corer; DEPTH, sediment/rock; Marion Dufresne (1995); MD08-3180; MD168; Melonis affinis, δ13C; Melonis affinis, δ18O
    Type: Dataset
    Format: text/tab-separated-values, 134 data points
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  • 8
    Publication Date: 2023-06-24
    Keywords: AGE; DEPTH, sediment/rock; GEOFAR; KF16; Le Noroit; Melonis affinis, δ13C; Melonis affinis, δ18O; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 139 data points
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  • 9
    Publication Date: 2023-07-10
    Keywords: 353-U1443; Accumulation rate, calcium carbonate; Accumulation rate, mass; Accumulation rate, non carbonate; AGE; Calcium carbonate; Carbonate Crash; COMPCORE; Composite Core; Density; Depth, composite; Exp353; Fraction, non-carbonate; Indian Ocean; Integrated Ocean Drilling Program / International Ocean Discovery Program; interpolated; IODP; IODP Depth Scale Terminology; Joides Resolution; Sedimentation rate; stable carbon isotopes; stable oxygen isotopes; XRF
    Type: Dataset
    Format: text/tab-separated-values, 35399 data points
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  • 10
    Publication Date: 2023-07-10
    Keywords: 353-U1443B; 353-U1443C; AGE; Aluminium, area, total counts; Calcium; Calcium, area, total counts; Calcium carbonate; Carbonate Crash; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp353; Indian Ocean; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; IODP Depth Scale Terminology; Iron, area, total counts; Joides Resolution; Manganese, area, total counts; Potassium, area, total counts; Sample code/label; Section position; Silicon, area, total counts; stable carbon isotopes; stable oxygen isotopes; Sulfur, area, total counts; Titanium, area, total counts; Total area, total counts; XRF
    Type: Dataset
    Format: text/tab-separated-values, 38122 data points
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