Abstract
A strong emission band extending from 3060 to 3120 Å was observed following proton beam excitation of an Ar-H 2O mixture. This emission band was assigned to the transition of OH( A 2 Σ +) υ=0 → OH( X 2 Π) υ=0 . At high argon partial pressure (> 200 torr), the precursor of this emission band is believed to be the argon excimer Ar ★ 2(1 u). The fluorescence efficiency of Ar-H 2O is estimated to be a factor of 4 times that of Ar-N 2. Development of a highly efficient, tunable uv laser by e-beam pumping is promising.
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