Introduction to Synchrotron Radiation
Frederico Alves Lima International School on Laser-Beam Interactions Centro Nacional de Pesquisa em Energia e Materiais - CNPEM UFRN - Natal, Brazil Laboratório Nacional de Luz Síncrotron - LNLS September 2016 Outline
✓ Tools for structural analysis
✓ History of X-rays
✓ Synchrotron Radiation
✓ LNLS & SIRIUS: Synchrotron Radiation in Brazil Why do we need to study “structure”
Structure Dynamics - X-ray crystallography - Laser spectroscopy - electron microscopy - NMR - atomic force microscopy - Time-resolved diffraction & XAS - electron diffraction - Time-resolved PES - X-ray absorption spectroscopy - NMR
Manganite: atomic motion coupled by charge and orbital order Graphene
Fullerene
Layer-selective spin dynamics in Nanotube magnetic multilayers Photosystem II Rotating hydrated Mb molecule What are the length scales involved ?
http://www.newgrounds.com/portal/view/525347 The Electromagnetic Spectrum
Electromagnetic wave ➟ Light! Orthogonal and alternating electric and magnetic fields that propagate into space.
Set of equations describing how electric and magnetic fields are generated and altered by each other and by charges and currents.
Maxwell’s equation of electromagnetism James Clerk Maxwell The Electromagnetic Spectrum
700 nm 400 nm
X-ray ➟ proper tool to investigate atoms. History of X-rays
In the evening of Nov. 8th 1895 Wilhem Röntgen first detected x-rays
He found that when running a high-voltage discharge tube enclosed in thick black cardboard which excluded all visible light, in his darkened room, a paper plate covered on one side with barium platinocyanide would fluoresce, even when it was as far as 2 m from the discharge tube. ➟
X-rays!
He soon discovered that these ‘x-rays’ also stained photographic plates and latter demonstrated that objects of different thicknesses showed different degrees of transparency.
First x-ray photograph of a human hand with a ring… probably from his wife! Synchrotron Radiation We need an extremely bright source of x-rays ➟ Synchrotron F divergence flux brightness Ω F / S ⌦ source area S ·
Synchrotrons are very bright because the source size and divergence are very small. But why is that? Synchrotron Radiation Accelerated electric charge ➟ electromagnetic radiation In the non-relativistic case, the dominant emission from an electric charge is dipolar.