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Browsing by Subject "spectroscopy"

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Atominterferometrie im Zeitbereich

Trebst, Tilmann (Hannover : Universität Hannover, 1999)

[no abstract]
Characterizing the Zeeman slowing force for 40Ca19F molecules

Kaebert, Paul; Stepanova, Mariia; Poll, Timo; Xu, Supeng; Petzold, Maurice; Siercke, Mirco; Ospelkaus, Silke (Bristol, Bad Honnef : IOP Publishing Ltd., Deutsche Physikalische Gesellschaft, 2021-09)

In this paper we investigate the feasibility of Zeeman slowing calcium monofluoride molecules originating from a cryogenic buffer gas cell. We measure the A^2Π1/2(v = 0, J = 1 2 ) − X^2Σ1/2 (v = 0, N = 1) hyperfine ...
Correlation-function spectroscopy of inelastic lifetime in heavily doped GaAs heterostructures

Könemann, J.; König, P.; Schmidt, T.; McCann, E.; Fal’ko, V.I.; Haug, Rolf J. (College Park, MD : American Physical Society, 2001)

Measurements of resonant tunneling through a localized impurity state are used to probe fluctuations in the local density of states of heavily doped GaAs. The measured differential conductance is analyzed in terms of ...
Detecting metrologically useful entanglement in the vicinity of Dicke states

Apellaniz, Iagoba; Lücke, Bernd; Peise, Jan; Klempt, Carsten; Toth, Geza (Bristol : IOP Publishing Ltd., 2015-08-13)

We present a method to verify the metrological usefulness of noisy Dicke states of a particle ensemble with only a few collective measurements, without the need for a direct measurement of the sensitivity. Our method ...
Evaluation of MODIS-derived estimates of the albedo over the Atacama Desert using ground-based spectral measurements

Cordero, Raúl R.; Feron, Sarah; Sepúlveda, Edgardo; Damiani, Alessandro; Carrera, Juan M.; Jorquera, Jose; Alfonso, Juan A.; Fuenzalida, Rosalino; Rivas, Miguel; MacDonell, Shelley; Seckmeyer, Gunther; Wang, Chenghao; Ouyang, Zutao; Lhermitte, Stef ([London] : Macmillan Publishers Limited, part of Springer Nature, 2021)

Surface albedo is an important forcing parameter that drives the radiative energy budget as it determines the fraction of the downwelling solar irradiance that the surface reflects. Here we report on ground-based measurements ...
High-order harmonic spectroscopy in an ionized high-density target

Kurz, Heiko G.; Kretschmar, Martin; Binhammer, Thomas; Nagy, Tamas; Ristau, Detlev; Lein, Manfred; Morgner, Uwe; Kovačev, Milutin (Lausanne : Frontiers Media, 2022)

We use high-order harmonic spectroscopy to study ionization dynamics in a macroscopic target with tunable density, spanning over six orders of magnitude. In an in situ pump-probe experiment, the target is prepared at ...
High-precision metrology with high-frequency nonclassical light sources

Denker, Timo (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2016)

[no abstract]
How to build an optical filter with an atomic vapor cell

Uhland, Denis; Dillmann, Helena; Wang, Yijun; Gerhardt, Ilja ([Bad Honnef] : Dt. Physikalische Ges., 2023)

The nature of atomic vapors, their natural alignment with interatomic transitions, and their ease of use make them highly suited for spectrally narrow-banded optical filters. Atomic filters come in two flavors: a filter ...
Improved bounds on Lorentz violation from composite pulse Ramsey spectroscopy in a trapped ion

Dreissen, Laura S.; Yeh, Chih-Han; Fürst, Henning A.; Grensemann, Kai C.; Mehlstäubler, Tanja E. ([London] : Nature Publishing Group UK, 2022)

In attempts to unify the four known fundamental forces in a single quantum-consistent theory, it is suggested that Lorentz symmetry may be broken at the Planck scale. Here we search for Lorentz violation at the low-energy ...
In situ ATR-FTIR study of H2O and D2O adsorption on TiO2 under UV irradiation

Belhadj, Hamza; Hakki, Amer; Robertson, Peter K.J.; Bahnemann, Detlef W. (Cambridge : Royal Society of Chemistry, 2015-08-06)

The adsorption of water and deuterium oxide on TiO2 surfaces was investigated in the dark as well as under UV(A) irradiation using in situ ATR-FTIR spectroscopy under oxygen and oxygen free conditions. Adsorption of H2O–D2O ...
The influence of storage and heat treatment on a magnesium-based implant material: An in vitro and in vivo study

Bracht, Katja; Angrisani, Nina; Seitz, Jan-Marten; Eifler, Rainer; Weizbauer, Andreas; Reifenrath, Janin (London : BioMed Central Ltd., 2015)

Background: Magnesium alloys are recommended as a potential material for osteosynthesis. It is known that storage-induced property modifications can occur in materials like aluminum. Thus the aim of this study was to analyze ...
Interferometrie mit lasergekühlten Atomen basierend auf resonanten Lichtfeldanregungen

Hinderthür, Henning (Hannover : Universität, 1999)

[no abstract]
Intracochlear near infrared stimulation: Feasibility of optoacoustic stimulation in vivo

Baumhoff, Peter; Kallweit, Nicole; Kral, Andrej (Amsterdam : Elsevier B.V., 2019)

Intracochlear optical stimulation has been suggested as an alternative approach to hearing prosthetics in recent years. This study investigated the properties of a near infrared laser (NIR) induced optoacoustic effect. ...
Investigations of GaN-based micro-pillars by a multi-scale scanning tunneling microscope

Kalkan, Fatih (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2012)

[no abstract]
Mixing of 0(+) and 0(-) observed in the hyperfine and Zeeman structure of ultracold Rb-2 molecules

Deiss, Markus; Drews, Bjoern; Denschlag, Johannes Hecker; Tiemann, Eberhard (Bristol : IOP Publishing Ltd., 2015-08-10)

We study the combination of the hyperfine and Zeeman structure in the spin-orbit coupled A(1)Sigma(+)(u) = b(3)Pi(u) complex of Rb-87(2). For this purpose, absorption spectroscopy at a magnetic field around B = 1000 G is ...
Negative conductance patterns of quantum dots: experiment and theory

Rogge, M.C.; Cavaliere, F.; Sassetti, M.; Haug, Rolf J.; Kramer, B. (Bristol : IOP Publishing Ltd., 2006)

Experimental results for the sequential transport through a lateral quantum dot in a perpendicular magnetic field are compared with theory. Regular patterns of negative differential conductances are observed in the nonlinear ...
Novel Ringdown Amplitude-Phase Consistency Test

Forteza, Xisco Jiménez; Bhagwat, Swetha; Kumar, Sumit; Pani, Paolo (College Park, Md. : APS, 2023)

The ringdown signal emitted during a binary black hole coalescence can be modeled as a linear superposition of the characteristic damped modes of the remnant black hole that get excited during the merger phase. While ...
A novel, robust quantum detection scheme

Hemmerling, Boerge; Gebert, Florian; Wan, Yong; Schmidt, Piet O. (Bristol : IOP Publishing Ltd., 2012)

Protocols used in quantum information and precision spectroscopy rely on efficient internal quantum state discrimination. With a single ion in a linear Paul trap, we implement a novel detection method which utilizes ...
Optische In-situ-Analytik photoautotropher Mikroorganismen in einem entwickelten geschlossenen Einweg-Photobioreaktorsystem

Zagermann, Serge Alexander (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2018)

[no abstract]
Preparation, Characterization, and Photocatalytic Applications of MWCNTs/TiO2 Composite

Kamil, Ahmed M.; Hussein, Falah H.; Halbus, Ahmed F.; Bahnemann, Detlef W. (New York : Hindawi Publishing Corporation, 2014)

The multiwall carbon nanotubes (MWCNTs)/titanium dioxide (P25) composite in different ratios was prepared using simple evaporation and drying process. The composite was characterized by Raman spectroscopy, X-ray diffraction ...

Now showing items 1-20 of 28

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