## 169. PRIMARY AND SECONDARY PROCESSES.

We studied in the earlier posts that the Stark-Einstein law holds true only for the primary process of a photochemical reaction. However, we never studied

## 168. QUANTUM YIELD

In the last post, we started talking about quantum yield. This quantity tells us how many molecules react by absorbing how many quanta of light.

## 166. LAWS OF PHOTOCHEMISTRY (12) – PHOTONS.

A post on photons and rest mass.

## 164. LAWS OF PHOTOCHEMISTRY (10).

In this post we are going to understand the exponential factor in Beer – Lambert’s law, by assigning imaginary values to different parameters in the

## 163. LAWS OF PHOTOCHEMISTRY (9).

Xenon Lamp – This is a gas discharge lamp where electricity is passed through ionized gas (xenon) at high pressure , to produce light. Gas

## 162. LAWS OF PHOTOCHEMISTRY (8).

In the previous post we studied the basic components of a spectrophotometer. Now let us learn each component in a little more detail. Light source

## 161.LAWS OF PHOTOCHEMISTRY (7).

In the previous post we studied the following equation for Beer – Lambert’s law – We understood that if we decide the intensity of incident

## 160. LAWS OF PHOTOCHEMISTRY (6).

You have encountered the above expression while studying Beer – Lambert’s law ,right? And did you wonder what this means? How do you arrive at

## 159.THE LAWS OF PHOTOCHEMISTRY (5).

In the last few posts we have been discussing the Beer – Lambert’s law and various terms associated with it. In this post we are

## 158. THE LAWS OF PHOTOCHEMISTRY (4).

Absorbance In the previous post, we introduced the term absorbance. The term absorbance quantifies the amount of light absorbed by a solution. We know from

## 157.THE LAWS OF PHOTOCHEMISTRY (3).

Absorbance and Transmittance Absorbance(A) and transmittance(T) are two sides of a coin. Absorbance (A) is the amount of light absorbed and transmittance is the the

## 156.THE LAWS OF PHOTOCHEMISTRY (2).

The Lambert’s Law We studied in the previous post, that according to Lambert’s law, absorbance (A) is directly proportional to the path length or thickness