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The Balmer-β line excited by low-energy electron impact (25-30 eV) on HCl has been measured at angles of 55°and 90°with respect to the electron beam by using a high resolution ( 0.033 Å) Fabry-Perot i...nterferometer. The translational ellergy distribution of H^*(n＝4) has been obtained through the analysis of its Doppler line shape. Differences of the two spectra and two distributions observed at 55°and 90°indicate that there is anisotropy of the spectrum and, thus, in the motion of the excited hydrogen atom. The high resolution spectroscopy on the electron-molecule collision has been known to give useful information on the mechanism of the dissociative excitation of a molecule；the present finding indicates the importance of the measurements of the angular dependence for the low electron energy near threshold.続きを見る
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Mendeley出力
