Abstract
With the aid of nanosecond laser flash photolysis OH is chemically produced and observed “collision free”. The rotational states show inverted population in the A doublets J = 3 2 , 5 2 , 7 2 , and 9 2 of 2Π 3 2 and anti-i higher rotational states. The intensities of the main and satellite absorption lines further indicate an inversion in special hyperfine states. Application to interstellar OH maser emission is considered.
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