| Sample Text Electron-atom
collisions play an important role in the following:
- HeNe Laser
- Semiconductor processing plasma
- Fluorescent lamps
- Neon signs
Electron-atom collisions are important in understadning
natural phenomena:
- Primordial (Bing Bang) helium abundance
- Planetrary nebula
- Upper atmosphere dynamics
Why Nitric Oxide?
- The Atmosphere:
- Planetary atmospheres (such as Venus)
- Interstellar space
- Bilogical systems
- Help desaign smog abatement devices
The Experiment
The idea behind the experiment is to measure the cross
sections of molecules for certain excitations.
This meaurement must be made indirectly. The
experiment makes this measurement in the following way:
- Electrons are fired into a chamber of NO.
- Some electrons hit molecules of no exciting them.
- The excited molecules emit light as they drop down from the
excited state (See fig. 3)
- The intensity of this light is detected.
- The intesity of the light detected is related to the size of
the cross sections of the moleclues.
The larger the cross section, the more molecules were
excited by the elcetron and the greater the intensity of light emitted (see fig. 4) |
