School of Physics Lecture Demonstration Manual

Oi-1 Fluorescence

Published: Wednesday 15 March 2006 - Updated: Monday 28 March 2011

Aim

To demonstrate fluorescence: i.e. Certain excited atoms will emit a photon of lower energy than the incident photon that caused the transition. If the process takes place rapidly (< 10 ^-7 sec) it is called Fluorescence.

Apparatus

Diagrams

Click on pictures to enlarge.

Fluoresence Diagram

Description

Various materials are available that fluoresce under the action of the strong ultraviolet source.

These include

There is also a set of tubes that illustrate the action of fluorescent discharge tubes: these are

  1.  Uncoated Mercury discharge tube
  2.  Mercury discharge tube half coated with white fluorescent powder
  3.  Fluorescent tubes coated with fluorescent powders
     
    •  Green
    •  Blue
    •  Fluorescent powder representing different colour temperatures
     

Safety notes

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