Variable energy neutral molecular beam source for large molecules

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Abstract
A variable energy neutral beam source is presented which utilizes a class of large molecules having the property of forming long−lived temporary negative ions. Negative ions are produced, accelerated, and focused, after which autodetachment of the electrons occur, leaving a beam of neutral molecules. The source has been used in total cross section experiments, where SF6 was the beam gas and various target gases were used in a scattering cell. Some results of the collision process SF6 + CO2 are presented. At 1200 eV lab energy (27 eV c.m. energy) the total collision cross section for CO2 is 54.2±15.9 Å2. Advantages and disadvantages of this type of source are discussed, and extensions to other types of experiments are explored.

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