Abstracts

Sirius is the 4^th generation synchrotron accelerator hosted by the Brazilian Synchrotron Light Laboratory from the Brazilian Center for Research in Energy and Materials (CNPEM). With capability of housing 39 beamlines, the broad energy range, from the mid-infrared up the X-rays, and its light properties such high flux and coherence have allowed cutting edge studies using this facility. Among the Sirius’ experimental stations, the Coherent X-ray Nanoprobe Beamline (Carnaúba) is an X-ray nanoscopy with capabilities of 2D, 3D, hyper, and multispectral studies through different contrasts such as luminescence, X-ray fluorescence (XRF), X-ray absorption (XAS), X-ray diffraction, and coherent imaging. The Carnaúba beamline is built with all-achromatic optical elements, with beamsize limited by diffraction at the Sapoti station and it covers the energy range from 2.05 up to 15 keV [1]. Beyond the Sapoti station, which has been assembled, the Tarumã one is already available for users and operates with a variable sample environment and submicrometric beamsize, achieving resolutions of about 12 nm using ptychography. Studies carried out in luminescent materials have shown that X-ray excited optical luminescence (XEOL) is a powerful tool to explore luminescence mechanism in inorganic scintillators, identifying optical channels in natural and heterogeneous materials, and following radiation damage through the optical response. Currently, the XEOL system is available to perform energy scan studies and 2D imaging [2]. Studies based on emission and excitation can be combined, bringing important information about the dynamic of charge carries upon the ionization. Furthermore, imaging studies have been carried out by raster scanning the sample in large areas, up to mm, with intensity mapping, and in smaller areas, in micrometric scale, providing hyperspectral information. Both these studies can be combined with other ones such as XAS, XRF and Scanning Transmission X-ray Microscopy (STXM) mapping providing a full description about the origin of luminescence under X-rays irradiation. Ongoing developments highlight the use of XEOL as analytical tool combining microreactors based on microfluidics [3], and the installation of a new spectrometer covering the optical range from 200 – 1700 nm, which will open new opportunities to study luminescent materials using the Sirius 4^th generation synchrotron source. References[1] Tolentino, Hélio CN, et al. "The CARNAÚBA X-ray nanospectroscopy beamline at the Sirius-LNLS synchrotron light source: Developments, commissioning, and first science at the TARUMÃ station." Journal of Electron Spectroscopy and Related Phenomena 266 (2023): 147340.[2] Teixeira, Verônica C., et al. "X-ray excited optical luminescence at Carnaúba, the Sirius X-ray nanoprobe beamline." Optical Materials: X 20 (2023): 100278.[3] Neckel, Itamar T., et al. "Development of a sticker sealed microfluidic device for in situ analytical measurements using synchrotron radiation." Scientific Reports 11.1 (2021): 23671.