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Laboratory quick near edge x-ray absorption fine structure spectroscopy in the soft x-ray range with 100 Hz frame rate using CMOS technology.
Jonas, Adrian; Staeck, Steffen; Kanngießer, Birgit; Stiel, Holger; Mantouvalou, Ioanna.
Afiliação
  • Jonas A; Berlin Laboratory for Innovative X-ray Technologies (BLiX), D-10623 Berlin, Germany.
  • Staeck S; Berlin Laboratory for Innovative X-ray Technologies (BLiX), D-10623 Berlin, Germany.
  • Kanngießer B; Berlin Laboratory for Innovative X-ray Technologies (BLiX), D-10623 Berlin, Germany.
  • Stiel H; Berlin Laboratory for Innovative X-ray Technologies (BLiX), D-10623 Berlin, Germany.
  • Mantouvalou I; Berlin Laboratory for Innovative X-ray Technologies (BLiX), D-10623 Berlin, Germany.
Rev Sci Instrum ; 92(2): 023102, 2021 Feb 01.
Article em En | MEDLINE | ID: mdl-33648064
In laboratory based x-ray absorption fine structure (XAFS) spectroscopy, the slow readout speed of conventional CCD cameras can prolong the measuring times by multiple orders of magnitude. Using pulsed sources, e.g., laser-based x-ray sources, the pulse repetition rate often exceeds the frame rate of the CCD camera. We report the use of a scientific CMOS (sCMOS) camera for XAFS spectroscopy with a laser-produced plasma source facilitating measurements at 100 Hz. With this technological improvement, a new class of experiments becomes possible, starting from the time consuming analysis of samples with small absorption to pump-probe investigations. Furthermore, laboratory quick soft x-ray absorption fine structure (QXAFS) measurements with 10 ms time resolution are rendered feasible. We present the characterization of the sCMOS camera concerning noise characteristics and a comparison to conventional CCD camera performance. The feasibility of time resolved QXAFS measurements is shown by analyzing the statistical uncertainty of single shot spectra. Finally, XAFS spectroscopy on a complex sandwich structure with minute amounts of NiO exemplifies the additional merits of fast detectors.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Rev Sci Instrum Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Alemanha

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Rev Sci Instrum Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Alemanha