OPTICAL SPECTRA OBSERVED DURING ION-MOLECULE COLLISIONS WITH LOW-ENERGY N2(+) AND Ar(+) BEAMS.
CALIFORNIA UNIV SANTA BARBARA
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A spectroscopic study has been made of the light emitted during ion-molecule collisions using Ar and N2 beams at laboratory energies ranging from 10 to 1000 eV Target gases for both ions included H2, D2, CO, N2, NO, N2O, CO2, CH4, and C2H2 in addition, He, Ne Ar and Kr were used as N2 targets. Preliminary spectra of the reactions He CO2 and Ar Ar also were obtained. Photon emission in the visible and near ultraviolet was found to be a common occurrence for ion-molecule reactions in this energy range. Several different types of reactions have been found which lead to electronically, rotationally and vibrationally excited states. Absolute cross sections for the production of some of the bright features observed in these reactions have been measured. Rotational and vibrational excitation of the collision products have been studied. In general, the rotational excitation increased as the energy of the bombarding ion decreased. A billiard ball model of the collision is presented which gives a semiquantitative explanation of the dependence of rotational excitation on the energy and identity of the incident ion for grazing collisions. The degree of vibrational excitation and its energy dependence depended on the reaction partners. Author
- Atomic and Molecular Physics and Spectroscopy