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Induced water condensation and bridge formation by electric fieldsin Atomic Force Microscopy

Description: We present an analytical model that explains how in humidenvironments the electric field near a sharp tip enhances the formationof water meniscii and bridges between tip and sample. The predictions ofthe model are compared with experimental measurements of the criticaldistance where the field strength causes bridge formation.
Date: February 22, 2006
Creator: Sacha, G.M.; Verdaguer, A. & Salmeron, M.
Partner: UNT Libraries Government Documents Department
open access

Desorption Dynamics, Internal Energies and Imaging of Organic Molecules from Surfaces with Laser Desorption and Vacuum Ultraviolet (VUV) Photoionization

Description: There is enormous interest in visualizing the chemical composition of organic material that comprises our world. A convenient method to obtain molecular information with high spatial resolution is imaging mass spectrometry. However, the internal energy deposited within molecules upon transfer to the gas phase from a surface can lead to increased fragmentation and to complications in analysis of mass spectra. Here it is shown that in laser desorption with postionization by tunable vacuum ultravi… more
Date: April 5, 2011
Creator: Kostko, Oleg; Takahashi, Lynelle K. & Ahmed, Musahid
Partner: UNT Libraries Government Documents Department
open access

In-situ scanning probe microscopy of electrodeposited nickel.

Description: The performance characteristics and material properties such as stress, microstructure, and composition of nickel coatings and electroformed components can be controlled over a wide range by the addition of small amounts of surface-active compounds to the electroplating bath. Saccharin is one compound that is widely utilized for its ability to reduce tensile stress and refine grain size in electrodeposited nickel. While the effects of saccharin on nickel electrodeposition have been studied by m… more
Date: October 1, 2004
Creator: Kelly, James J. & Dibble, Dean C.
Partner: UNT Libraries Government Documents Department
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