Digging gold: keV He+ ion interaction with Au

Digging gold: keV He+ ion interaction with Au

Helium ion microscopy (HIM) was used to investigate the interaction of a focused He(+) ion beam with energies of several tens of kiloelectronvolts with metals. HIM is usually applied for the visualization of materials with extreme surface sensitivity and resolution. However, the use of high ion fluences can lead to significant sample modifications. We have characterized the changes caused by a ...

Gold-thiolate cluster emission from SAMs under keV ion bombardment: Experiments and molecular dynamics simulations

In this contribution the emission of gold-molecule cluster ions from self-assembled monolayers (SAMs) of alkanethiols on gold is investigated using time-of-flight secondary ion mass spectrometry (ToF-SIMS). Layers of alkanethiols [CH3(CH2)nSH] with various chain lengths (n 1⁄4 8, 12, 16) have been chosen because they form well-ordered molecular monolayers on gold. First, we compare and interpre...

Microstructure of 5 keV gold-implanted polydimethylsiloxane

Peptide fragmentation by keV ion-induced dissociation.

We have studied multiple ionization and dissociation of a trapped protonated peptide (leucine enkephalin) as induced by keV singly and doubly charged ions (H(+), He(+, 2+)) to demonstrate the potential of keV ions as a future tool for peptide identification. In contrast to conventional excitation techniques, the fragmentation pattern exhibits very strong peaks due to loss of sidechains in addit...

Gold ion-angiotensin peptide interaction by mass spectrometry.

Stimulated by the interest in developing gold compounds for treating cancer, gold ion-angiotensin peptide interactions are investigated by mass spectrometry. Under the experimental conditions used, the majority of gold ion-angiotensin peptide complexes contain gold in the oxidation states I and III. Both ESI-MS and MALDI-TOF MS detect singly/multiply charged ions for mononuclear/multinuclear go...