Abstract
The OH(A–X) emissions produced by electron impact on targets seeded in an argon or helium jet have been measured to determine internal state distributions of OH(A). For H 2O, the rotational distributions of the main component for OH(A, ν′=0 and 1) can be represented by a Boltzmann temperature ( T ν′), which increases with the impact energy and strongly depends on the source condition: T 0 values measured at 18 eV are 6500 K in argon jet, 12500 K in helium jet and 18500 K in the effusive beam. For CH 3OH, the value of 6800 K for T 0 observed in argon jet agrees with that in the effusive beam and is independent of the impact energy. The dependence of T 0 on the source condition observed form H 2O is ascribed to formation of OH(A) from (H 2O) n clusters produced in the jet expansion
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