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Autor*in

  • Schmid, Thomas (47)
  • Dariz, P. (13)
  • Abou-Ras, D. (4)
  • Gornushkin, Igor B. (4)
  • Panne, Ulrich (4)
  • Schäfer, N. (4)
  • Brandt, Guido (3)
  • Büchele, Dominique (3)
  • Eschlböck-Fuchs, S. (3)
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  • Raman microspectroscopy (8)
  • Raman spectroscopy (7)
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Organisationseinheit der BAM

  • 1 Analytische Chemie; Referenzmaterialien (44)
  • 1.4 Prozessanalytik (44)
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Orientation-distribution mapping of polycrystalline materials by Raman microspectroscopy (2015)
Schmid, Thomas ; Schäfer, N. ; Levcenko, S. ; Rissom, T. ; Abou-Ras, D.
Raman microspectroscopy provides the means to obtain local orientations on polycrystalline materials at the submicrometer level. The present work demonstrates how orientation-distribution maps composed of Raman intensity distributions can be acquired on large areas of several hundreds of square micrometers. A polycrystalline CuInSe2 thin film was used as a model system. The orientation distributions are evidenced by corresponding measurements using electron backscatter diffraction (EBSD) on the same identical specimen positions. The quantitative, local orientation information obtained by means of EBSD was used to calculate the theoretical Raman intensities for specific grain orientations, which agree well with the experimental values. The presented approach establishes new horizons for Raman microspectroscopy as a tool for quantitative, microstructural analysis at submicrometer resolution.
Correlative Raman and electron backscatter diffraction mapping on CulnSe2 thin films (2015)
Schmid, Thomas
Bildgebende Phasenbestimmung mittels Ramanmikroskopie- Grundlagen und Anwendungen an Zementstein (2015)
Schmid, Thomas
Two calibration-free approaches of analysis of industrial oxides by laser-induced breakdown spectroskopy (2015)
Schmid, Thomas
Shedding light onto the spectra of lime: Raman and luminescence bands of CaO, Ca(OH)2 and CaCO3 (2015)
Schmid, Thomas ; Dariz, P.
In microscopy studies of 19th-century cement stone, we found free lime in the form of darkened spherical structures, as they were described in the literature already. When trying to determine their phase composition by Raman spectroscopy, we encountered contradictive assignments in literature spectra of the lime phases CaO, Ca(OH)2 and CaCO3 and observed strong spectral features that have been ignored or erroneously assigned so far. In this study we present Raman spectra of pure lime phases and of a naturally grown calcite crystal, burnt limestone (quick lime, mainly CaO), aged slaked lime putty (mainly Ca(OH)2), and carbonated lime putty (mainly CaCO3). Based on the results, we shed light mainly onto these two questions: (1) Does CaO have a Raman spectrum? (2) Which features in the spectra are luminescence bands that could be (and already have been) misinterpreted as Raman bands? We proof our assignment of luminescence bands in lime phases by using three different laser wavelengths for excitation, and give hypotheses on the origin of the luminescence as well as practical advices on how to identify these misleading features in Raman spectra. This article is mainly addressed to users of Raman spectroscopy in different fields of material analysis who might not be aware of the presence of interfering bands in their spectra.
Characterization of Cu (In x, Ga y) (S m, Se n) 2 thin-film solar cell materials by Raman microscopy (2014)
Schmid, Thomas
Raman spectroscopy in thin-film solar cell research (2015)
Schmid, Thomas
Determination and imaging of binder remnants and aggregates in historic cement stone by Raman microscopy (2014)
Schmid, Thomas
Möglichkeiten zur Sonderprobenanalytik - Gemeinsame Aktivitäten mit dem Salsa-Applikationslabor der Humboldt Universität zu Berlin (2015)
Maiwald, Michael ; Schmid, Thomas
Troubleshooting Samples Analytics: Impurities in products: unexpected & unwanted occurrence, unknown identity, analytical method unclear, often various analytical methods, necessary, short response time important (< 1 d), benefits: allocation of its source within hours safes cost • Investigations planned, coordinated and documented by TSA team • Variety of analytical methods available
Development of an online-analysis technique for the determination of plant essential nutrients in soils using XRF and LIBS (2016)
Rühlmann, Madlen ; Büchele, Dominique ; Schmid, Thomas ; Ostermann, Markus
Currently, there is almost no comprehensive mapping of agricultural cropland because of the lack of fast and affordable mapping methods for important soil properties. Arable land of some hectares in size show a broad range of different nutrient compositions. Because of this heterogeneity wrong fertilization can occur and can cause environmental pollution or lead to smaller harvests and this is simply a waste of resources. The goal of I4S (intelligence for soil) is to develop an integrated system for site-specific soil fertility management. The I4S consortium consists of 10 different institutions, which are testing various sensors for their suitability for the requested applications. Besides the preparation of reference materials, the main task of the Federal Institute for Materials Research and Testing (BAM) in this project is the method development for online-XRF (x-ray fluorescence spectroscopy) and for online-LIBS (laser-induced breakdown spectroscopy) sensor systems. Both methods have the advantage that there is no or only little sample preparation necessary. Each method provides a fast and simultaneous multi-element analysis. Both measurement setups can be utilized for a mobile application which is fundamental for reaching the goals of I4S. Having finally a set of some reference materials, further work will focus on the online-XRF and online-LIBS methods in order to obtain useable calibration models. The calibration models will then be tested using stationary and moving samples.
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