This project is really just a 'wrapper' for the linear ccd module so for details about driving and reading the TCD1304 refer to that project.

The following is a (very) brief introduction to reaction rates.

For a given reaction:

The reaction rate, *v*, is defined as:

many reactions have rates that follow the concentration of the reactants as:

However, this is a pure empirical relation and the reaction orders of A and B (n and m) cannot be deduced except by experiment (and to make matters worse, they may change with the conditions of the reaction).

When combining the two expressions for *v,* we get this differential equation:

Obviously we must ignore B (in the lab this is done by keeping its concentration constant)*. *The reaction order for A, n, usually takes the integral values: 0, 1 or 2 (but anything is possible). For the three "normal" values of n, the differential equation has the following solutions:

In a chemiluminescent reaction the light intensity, *I*, is proportional to the reaction rate so we can write:

By measuring *I* over time, one can essentially find a function that describes the reaction rate as function of time. If the reaction is "well behaved" ie. if the reaction order is either 0, 1 or 2, this function should be identical to the 1st derivative of one of the 3 solutions to the differential equation.

In brief, the reaction rate is:

- constant, for 0th order reactions
- an exponential function of time, for 1st order
- a hyperbola or something (1/t²), for 2nd order

Ha, this is certainly an interesting use of the TCD104 :)