The Ammonia Gas MSER is the first MASER to be developed in 1954. It is named so because it is based on the molecule of ammonia. It was developed by Towns, Gordan, & Zeiger.
- It consists of an “O” shaped oven to excite the ammonia molecule. The excited molecule steam out through the outlet “H” and then pass through the seprater “S”. A seprator “S” consists of charged rod & is cylindrical in shape.
- Excited ammonia molecules are repeled by the electric field of charged rods of seprator while unexcited molecules are attracted, but since the force of repulsion from all the side of cylinder separator will balance, the excited molecule will continue to move along axis of seprator and reach the resonance cavity “R”. The unexcited molecule will be removed by attraction of electric field.
|Fig. Experimental setup
of Ammonia Gas MASER.
- In the resonance cavity the excited ammonia molecules are subjected to stimulated emission by allowing a beam of photon of frequency 24000MHz to enter the cavity through the wave guide “w” under the effect of incident microwave beam, the excited ammonia molecule give out photon of frequency 24000MHz by the process of stimulating emission.
- These photons further stimulates another photons & these stimulating photon come out through output signal as intense MASER beam.