Ro-inversional Spectrum of Ammonia
نویسندگان
چکیده
In the development of spectroscopy the symmetric top molecule ammonia, NH 3 , has always played an important role f rom an experimental, theoretical and astrophysical point of view, and it continues to do so. It's pyramidal structure leads to the well known inversional transitions in the 1.2 cm wave region, which were the first molecular lines to be measured in absorption by microwave techniques [ 1 ]. These inversional transitions were used by Townes and coworkers to demonstrate in molecular beams the principle of state selection and thus maser action [2J. The very same transitions gave the first evidence of the existence of polyatomic molecules in interstellar space [3].
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