In the chemistry of interstellar clouds, the three-atomic hydrogen ion plays a key role. In these reactions, also simple organic molecules form. Although H3+ is the simplest polyatomic molecular ion, ...

Bombarding a material with an ion beam provides valuable information about its surface composition. Ion guns that fire polyatomic ions can reveal more detailed information and cause less damage to the ...

IT has been shown elsewhere 1–4 how the photo-ionization yield curves of ethylene and of some halogenated derivatives of the ethylene molecule can be interpreted by means of step functions resulting ...