Secondary ion yields produced by keV atomic and polyatomic ion impacts on a self-assembled monolayer surface

A suite of keV polyatomic or 'cluster' projectiles was used to bombard unoxidized and oxidized self-assembled monolayer surfaces. Negative secondary ion yields, collected at the limit of single ion impacts, were measured and compared for both molecular and fragment ions. In contrast to targets that are orders of magnitude thicker than the penetration range of the primary ions, secondary ion yields from polyatomic projectile impacts on self-assembled monolayers show little to no enhancement when compared with monatomic projectiles at the same velocity. This unusual trend is most likely due to the structural arrangement and bonding characteristics of the monolayer molecules with the Au(111). Copyright 1999 John Wiley & Sons, Ltd.     

The study of the changes in the thermal properties of <Emphasis Type="Italic">Labeo rohita</Emphasis> bones due to arsenic exposure

The paper presents the changes in the thermal properties of control, arsenic exposed and DMSA treated Labeo rohita bones by using thermo analytical techniques. The result shows that the mass loss due to the thermal decomposition occurs in three distinct steps due to loss of water, organic and inorganic materials. The arsenic exposed bones present a different thermal behaviour compared to the control bones. The residue masses are increased due to arsenic exposure, while the DMSA treatment reduces the residue mass level. These thermal characteristics can be used as a qualitative method to check the metal accumulation in samples.     

Lifting representations of ℤ-groups

LetK be the kernel of an epimorphismG→ℤ, whereG is a finitely presented group. IfK has infinitely many subgroups of index 2,3 or 4, then it has uncountably many. Moreover, ifK is the commutator subgroup of a classical knot groupG, then any homomorphism fromK onto the symmetric groupS ₂ (resp. ℤ₃) lifts to a homomorphism ontoS ₃ (resp. alternating groupA ₄). Both authors partially supported by NSF grants DMS-0071004 and DMS-0304971.     

Towards a Measurement of the n=2 Lamb Shift in Hydrogen-like Nitrogen Using an Electron Beam Ion Trap

Hyperfine Interactions - Using a 14C16O2 laser the 2s 1/2–2p 3/2 (fine structure – Lamb shift) transition has been induced in 14N6+ ions trapped in an electron beam ion trap. Prospects...     

Formation of plutonium/IV/ colloid from plutonyl cations

Solutions of plutonyl cations in dilute acids gradually form Pu/IV/ polymer under the influence of alpha radiations. These systems have properties that can be illuminated by assuming conditions to be near equilibrium and constrained by mass conservation.Mound is operated by Monsanto Research Corporation for the U.S. Department of Energy under Contract DE-AC04-76-DP00053.     

Bivariate interpolation for experimental designs

Two new methods of bivariate interpolation suitable for experimental designs are summarized. The methods use experimental data obtained in usual manner. The programs are short and rapid and are often more accurate on test functions than the standard method.     

Operational method of data treatment

A new instrument of exploration can be used to develop unrecognized connections among points in a variety of geometric designs. Operational methods are used to derive the relationships, and a new approach to extremum location is demonstrated. The technique is suitable for interpolation problems which arise in experimental design and the treatment of data.