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| Hauptseite > Publikationsdatenbank > Laboratory Course Neutron Scattering: Lectures |
| Hauptseite > Publikationsdatenbank > Laboratory Course Neutron Scattering: Lectures |
| Book | PreJuSER-16299 |
; ; ; ;
2011
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
ISBN: 978-3-89336-725-2
Please use a persistent id in citations: http://hdl.handle.net/2128/15304
Abstract: In this chapter, we will start with a very gentle qualitative introduction entirely without formula to give you an idea what the course is all about. The details will follow in subsequent chapters. Imagine you leave this lecture hall, some mean looking guys dressed entirely in black follow, kidnap and take you to the medieval castle of Nideggen in the close-by Eifel mountains. There you are being thrown into a pitch dark dungeon. You cannot see anything, but you hear some noises. Are there rats? Are there other prisoners? Are there dragons? Luckily you remember that you have some matches in your pocket. You light a match, you can see everything around you and everything becomes clear to you… What I have just described is essentially like a scattering experiment: figuratively it sheds light into darkness and helps us understand the world around us. Let’s analyse what you did in the dungeon: first when you light the match, you start a source of radiation. Here the radiation is light. This light then gets scattered (reflected, transmitted) from the surrounding objects. In a scientific scattering experiment, we will call this object a “sample”. Back to the dungeon: some of this radiation gets scattered into your eye. Your eye serves as very special radiation detector: with its lens, it is able to even make an image of the objects on the retina, which in the language of a physicist would be called an “area position sensitive pixel detector”. This image contains lots of information: the colour of the backscattered light tells you something about the absorption of certain components of the light and therefore gives information about the material the light is scattered from. The position of the signal on the retina gives you information about the spatial arrangement of the objects around you. And finally the time dependence of the signal tells you that the monster is actually crawling towards you, ready to attack. All this information has to be treated and interpreted. This is done by our brain, an extremely powerful computer to analyse this wealth of data. This little example shows you the importance of scattering for our understanding of the world: nearly all information that we as individuals have about the world in which we live comes from light scattering and imaging through our eyes. It is only natural that scientists mimic this process of obtaining information in well controlled scattering experiments: they build a source of radiation, direct a beam of radiation towards a sample, detect the radiation scattered from a sample, i. e. convert the signal into an electronic signal, which they can then treat by means of computers. In most cases one wants an undisturbed image of the object under investigation and therefore chooses the radiation, so that it does not influence or modify the sample. Scattering is therefore a non-destructive and very gentle method, if the appropriate type of radiation is chosen for the experiment. [...]
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Talk (non conference)
Introduction: Neutron Scattering in Contemporary Research
Laboratory Course Neutron Scattering (Lectures)
Seminar, Jülich & GarchingJülich & Garching, 5 Sep 2011
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Talk (non conference)
Spin dependent and magnetic scattering
Laboratory Course Neutron Scattering (Lectures)
Seminar, Jülich & GarchingJülich & Garching, 5 Sep 2011
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Talk (non conference)
Neutron reflectometry
Laboratory Course Neutron Scattering (Lectures)
Seminar, Jülich & GarchingJülich & Garching, 5 Sep 2011
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Talk (non conference)
Magnetic nanostructures
Laboratory Course Neutron Scattering (Lectures)
Seminar, Jülich & GarchingJülich & Garching, 5 Sep 2011
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Talk (non conference)
Strongly correlated electrons
Laboratory Course Neutron Scattering (Lectures)
Seminar, Jülich & GarchingJülich & Garching, 5 Sep 2011
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Talk (non conference)
Applications of neutron scattering - an overview
Laboratory Course Neutron Scattering (Lectures)
Seminar, Jülich & GarchingJülich & Garching, 5 Sep 2011
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Talk (non conference)
Inelastic Scattering
Laboratory Course Neutron Scattering (Lectures)
Seminar, Jülich & GarchingJülich & Garching, 5 Sep 2011
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Talk (non conference)
Nanostructures Investigated by Small Angle Neutron Scattering
Laboratory Course Neutron Scattering (Lectures)
Seminar, Jülich - GarchingJülich - Garching, 5 Sep 2011
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Talk (non conference)
Macromolecules (structure)
Laboratory Course Neutron Scattering (Lectures)
Seminar, Jülich & GarchingJülich & Garching, 5 Sep 2011
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Inelastic neutron scattering
Laboratory Course Neutron Scattering (Lectures)
Seminar, Jülich & GarchingJülich & Garching, 5 Sep 2011
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Talk (non conference)
Dynamics of Macromolecules
Laboratory Course Neutron Scattering (Lectures)
Seminar, Jülich & GarchingJülich & Garching, 5 Sep 2011
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