The Interaction of Radiation with Matter
- Created by: Rebecca Neal
- Created on: 28-04-13 11:01
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- The Interaction of Radiation with Matter
- Translation energy
- the whole molecule moves from place to place.
- Rotational energy
- The whole molecule rotates. Microwave radiation.
- Vibrational energy
- the bonds within the molecule vibrate. Infrared radiation.
- Electronic energy
- electrons move from one energy level to another. U.V and visible radiation.
- Visible- electrons excited to higher energy levels (coloured substances).
- U.V.-bonds break, photodissociation, forms radicals.
- High U.V.-ionisation occurs, electron lost from atom/molecule.
- E=hv
- Heterolytic fission- a bond splitting to form ions
- Double- headed arrow -> the movement of two electrons
- Homolytic fission- radicals formed
- Single- headed arrow -> the movement of one electron
- Radicals are atoms or molecules with at least one unpaired outer shell electron. They are very unstable and very reactive.
- Mechanism of radical chain reaction
- Initiation- makes radicals, triggered by photodissociation.
- Propogation- uses radicals to make more -> produces radical with a molecule.
- Termination
- Translation energy
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