Translational energy distribution of the excited hydrogen atom produced by controlled electron impact on HCl |
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Authors: | Morihide Higo Teiichiro Ogawa |
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Affiliation: | Department of Molecular Science and Technology, Kyushu University, Hakozaki, Fukuaka 812, Japan |
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Abstract: | The translational energy distribution of an atom can be calculated by differentiating the Doppler line shape of its emission line taken at a high optical resolution. The Balmer-β line of the excited hydrogen atom (n = 4) produced by electron impact on HCl has been measured at a high resolution (0.033Å) and at two angles (55° and 90°) with respect to the electron beam. The translation energy distribution depends on the electron energies and has almost two groups of components: ≈ 5 eV (fast) and ≈ eV (slow). Anisotropy is imporant for the slow component. The excitation function shows the corresponding structures. It is concluded that Rydberg states converging to the 2Π state of HCl+ produce the fast component and Rydberg states converging to the repulsive HCl+ states which cross the 2Σ+ state produce the slow component. |
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