Reflectivity measurements indicate a large discrepancy with expected results. Additionally, the reflectivity curve for a BaSO4 coated screen has been measured. The Automated monochromator was then used for spectral measurements of a Platinum Lamp. Resolution and sensitivity of the Automated Scanning Monochromator System were determined experimentally. The LabVIEW Virtual Instrument written to operate the ARC Monochromator is a mouse driven user friendly program developed for automated spectral data measurements.
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(author)ĭevelopment of an automated scanning monochromator for sensitivity calibration of the MUSTANG instrumentĪn Automated Scanning Monochromator was developed using: an Acton Research Corporation (ARC) Monochromator, Ealing Photomultiplier Tube and a Macintosh PC in conjunction with LabVIEW software. In this work we investigated the STEM performance of a 200 kV monochromated Tecnai F20 with a high resolution Gatan Imaging Filter (HR-GIF). In combination with a monochromator microscope not only high spatial resolution images can be recorded but also high energy resolution EELS spectra are attainable. The method of atomic resolution Z-contrast imaging within an STEM, utilizing a high-angle annular dark-field (HAADF) detector can perfectly complement the excellent energy resolution, since EELS spectra can be collected simultaneously. To overcome this limitation a Wien filter monochromator was recently introduced with commercially available STEMs, offering the advantage to better resolve EELS fine structures, which contain valuable bonding information. The energy resolution in EELS is largely limited by the stability of the high voltage supply, by the resolution of the spectrometer and by the energy spread of the source. Hofer, F.įull text: Electron energy-loss spectroscopy (EELS) has developed into an established technique for chemical and structural analysis of thin specimens in the ( scanning) transmission electron microscope (S)TEM. International Nuclear Information System (INIS) Monochromated scanning transmission electron microscopy This progress makes the new system extremely user friendly and efficient to use for time resolved x-ray absorption spectroscopy at synchrotron radiation beamlines.
Thus, e.g., switching between edges scanned with the same energy range is possible within one in situ experiment, while also the time resolution can be varied simultaneously.
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A new software package allows performing programmed scan sequences, which enable the user to measure stepwise with alternating parameters in predefined time segments. within 20 s, while the mechanics are capable to move with frequencies of up to ca. The Bragg angle range covered by the oscillating crystal can currently be changed from 0 deg. The energy scale was determined by a fast and accurate angular encoder system measuring the Bragg angle of the monochromator crystal with subarcsecond resolution. The advanced mechanics are explained in detail and the performance is characterized with x-ray absorption spectra of pure metal foils. Completely new experiments are feasible due to the fact that time resolution, edge energy, and energy range of the acquired spectra can be changed continuously within seconds without breaking the vacuum of the monochromator vessel and even without interrupting the measurements. Novel driving mechanics allow changing the energy range of the acquired spectra by remote control during data acquisition for the first time, thus dramatically increasing the flexibility and convenience of this method. 20, 42097 Wuppertal (Germany)Ī new monochromator setup for quick scanning x-ray absorption spectroscopy in the subsecond time regime is presented. [Fachbereich C, Physik, Bergische Universitaet Wuppertal, Gaussstr.
A new flexible monochromator setup for quick scanning x-ray absorption spectroscopyĮnergy Technology Data Exchange (ETDEWEB)
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