Abstract
High-resolution, angular-dependent electron spectrometric studies and ab initio quantum mechanical calculations of the simple Penning ionization systems He (2 3S, 2 1S)+Li(2 2S) are presented, demonstrating the importance of electron angular distribution effects on the spectra of attractive Penning ionization systems (well depth D* e ⪢ average collision energy Ē rel). The influence of previously neglected rotational energy exchange between the emitted electron and the quasi-molecule is discussed and related to the experimental observations. These new results are relevant to the determination of potential well depths D* e and semiempirical autoionization width functions from electron spectra for attractive Penning systems.
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