08-10-2012
The PhD students and Mauro Guerra Pedro Amaro, and their supervisor José Paulo Santos, CFA-FCT and FCT Department of Physics, and scientists of the Laboratoire Kastler Brossel (LKB) and the Université Pierre et Marie Curie developed a double spectrometer crystal, which was used for the first time on a highly charged ions to measure (reference-free) the transition M1 highly with an accuracy of 2.5 ppm. The results were published in Physical Review Letters, a prestigious top-rakend journal.
This spectrometer allowed the establishment of the first x-ray standard based on a narrow, symmetric line that can be used to calibrate any instrument in this energy range to a 2.5 ppm accuracy, without the problems associated with previous, x-ray tubes based standards. It is envisaged the use of this device in future measurements of the proton beam.
This work was funded by the Fundação para a Ciência e Tecnologia through two research projects and two PhD scholarships.
Link to the article: http://link.aps.org/doi/10.1103/PhysRevLett.109.043005
Link to the CFA-FCT: http://www.cfa.fct.unl.pt
Link to the LKB: http://www.lkb.ens.fr/
