Can I read Secondary‐ion and Electron Production from Surfaces Bombarded by Large Polyatomic Ions on EtoBox?

Secondary‐ion and Electron Production from Surfaces Bombarded by Large Polyatomic Ions by J. Martens; W. Ens; K. G. Standing; A. Verentchikov is a Chemistry article available to read on EtoBox.

What is Secondary‐ion and Electron Production from Surfaces Bombarded by Large Polyatomic Ions about?

## Abstract Heavy molecular ions with energies in the range 10–20 keV and masses from 276 u to 132 000 u, produced by matrix‐assisted laser desorption, were used as primary projectiles to produce secondary‐ion spectra from a variety of surfaces ina tandem time‐of‐fight mass spectrometer. In the negative mode the ratio of electron emission to secondary‐ion emission was found to decrease rapidly with increasing projectile mass. Ion emission was found to dominate for primary ions larger than ∼ 10 000 u. Positive or negative molecular ions and cations were observed from several organic targets of masses up to 1140 u (gramicidin S) for incident projectiles up to mass 132 000 u, i. e., for projectile speeds down to ∼7000 m/s. Other ions characteristic of the target were also observed for these projectiles. Thus, large polyatomic ions can cause secondary‐ion desorption even at very low velocity. The background ions of both polarities are similar to those found in keV particle bombardment by monatomic projectiles. The same ions are observed for all the projectiles; most can be identified with hydrocarbon background. The relative intensities of the background positive ions are largely indep

Who reads Secondary‐ion and Electron Production from Surfaces Bombarded by Large Polyatomic Ions?

Author

J. Martens; W. Ens; K. G. Standing; A. Verentchikov

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0951-4198)

Published

1992

Language

EN

Field

Chemistry (Physical Sciences)