It is well known that, after lightning precipitation is formed and heavy rain follows due to dissociation, ionization, and natural seeding process in the atmosphere. It is shown in this paper that, these natural phenomena can be used for artificial rain making by plasma laser pulse in the atmosphere which is also confirmed in the laboratory experiment. As per our calculations 2.2 x 1019 gm of water drops are formed in the atmosphere by laser pulse of energy 500 mJ . In this system, plasma laser pulse creates high temp up to 3000oC. At these temp bonds of major species of N2 and O2 break up into excited N * and excited O* . These excited atoms are very unstable and immediately react to form NO and O3. These reactions are endothermic and absorb a large amount of heat from the surrounding atmospheric clouds, where condensation takes place (condensation is the basic need for formation of water drops). Simultaneously N2 and O2 will be ionized to form N2 + , O2 + and O2 - . These precursor ions will undergo several reactions and will become big clustered ions. These big ions will act as seed which will lead to precipitation and rain. Low temperature created by dissociation will further help to grow bigger ions fast to produce CCN (cloud condensation nuclei) water drops and rainfall. These rain drops will act as natural seeding process and due to the flow of air in the upper atmosphere another set of rain drops will be formed, resulting in more rainfall. Model system for artificial rainmaking is also proposed in the paper.
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