Author： Keller W. Morgner H. Müller W.A.
Publisher： Taylor & Francis Ltd
ISSN： 1362-3028
Source： Molecular Physics, Vol.57, Iss.3, 1986-02, pp. : 637-644
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Abstract
We measure the electron energy spectra of formamide and N -methylformamide from HeI photoionization and He(2 3 S ) Penning ionization. The analysis of our data suggests that ionization of these molecules by He(2 3 S ) occurs most effectively if the He(2 3 S ) atom is close to the oxygen atom. The reason is that in this geometry He(2 3 S ) experiences a strong attraction and thus comes into much closer contact with the molecule than for any other direction of approach. Thus, metastable helium atoms He(2 3 S ) are attracted to the molecules along the same direction as are acidic groups of other molecules when a hydrogen bond is formed.
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