ROTATIONAL EXCITATION OF $N_{2}^{+}$ AND VIBRATIONAL STATE RESOLVED ION MOLECULE REACTIONS
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Date
1981
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Ohio State University
Abstract
The $N_{2}^{+}$ first negative system $(B ^{2}\Sigma^{+}_{u} - X ^{2}\Sigma^{+}_{g})$ has been recorded by laser induced fluorescences of $N_{2}^{+}$ ions confined in an rf trap. The ions were produced by electron impact and had an initial rotational distribution close to the room temperature distribution of the target $N_{2}$ gas. By admitting Ar gas at pressures 10 to 100 times in excess of the $N_{2}$ pressure, variable numbers of $N_{2}^{+} - Ar$ collisions were allowed to occur before the $N_{2}^{+}$ distribution was interrogated by the laser. Since the $N_{2}^{+}$ was translationally energetic, being driven by the trap fields, a rapid and extensive T to R energy transfer was observed. In this way, high rotational states of $N_{2}^{+}$ were populated and the radiative lifetimes of these states were measured. Cross sections for the reaction of specific vibrational states of $N_{2}^{+}$ with Ar and $H_{2}(D_{2})$ have been measured.
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