November 6, 2014  |  Time: 1:00-5:00 PM 
Sinclair Laboratory Auditorium (7 Asa Drive) | Lehigh U.

Lectures | Speaker bios | About the HS-LEIS, HR-XPS, and AFM systems


High-Sensitivity LEIS Principles & Applications

Dr. Hidde Brongersma (inventor of the HS-LEIS)
TU/e, Imperial College, ION-TOF

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VG Scienta PES solutions

Dr. Henrik Bergersen
VG Scienta

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Optical Spectroscopy

Prof. Israel E. Wachs
Operando Molecular Spectroscopy & Catalysis Lab,
Lehigh University

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Atomic Force Microscopy

Prof. Jonas Baltrusaitis
Lehigh University

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Dr. Henrik Bergersen, VG Scienta

Henrik Bergersen is currently International Sales Officer at VG Scienta in Uppsala Sweden, where he is responsible for product management, marketing, and technical sales support to certain regions. He obtained his M. Sc. From Uppsala University in 2004 and his Ph D from Uppsala University in 2008. During his Ph D time he used ambient pressure PES (APPES) to study free neutral clusters and liquid jets.


Dr. Hidde Brongersma, Calipso BV/ION-TOF

Hidde Brongersma studied both physics and chemistry at Leiden University, where he also received his PhD. During his career he has worked at the interface of physics and chemistry. After a postdoc at Caltech he joined Philips Electronics where he was at the cradle of Low Energy Ion Scattering (LEIS). During his time at Philips he directed research on the development of the compact disc, optical fibers, and a variety of high-end glass applications. Parallel to his industrial career, he was appointed as a professor of chemistry at Leiden University. Later he joined the faculty of physics at the Eindhoven University of Technology. This gave him the opportunity to further develop the LEIS technique and apply it to solve problems in a great variety of materials applications. He holds patents on the compact disc, optical fibers and on LEIS. In Eindhoven he directed large research efforts on catalysis, polymers, III-V semiconductors and ceramics, and was a member of the Board of two Centers of Excellence in The Netherlands. Brongersma received numerous awards, an honorary doctorate and the prestigious Jacob Kistemaker prize in physics. Most recently, he started a successful start-up company, Calipso, which was at the basis of the High-Sensitivity LEIS technique that is now further developed and marketed by ION-TOF in Germany. In 2010 he was appointed as a visiting professor at Imperial College in London.


Dr. Israel E. Wachs, Lehigh University

Israel Wachs, G. Whitney Snyder professor of chemical engineering at Lehigh University, studies complex phenomena related to surface oxides. He has demonstrated that, for many two-component metal oxide systems, one metal oxide may be present as an atomically dispersed phase over a second metal oxide substrate. His research team systematically examines various structures of these atomically dispersed surface oxides on oxide substrates to determines the factors that control the metal oxide structure. Much of the structural information about surface oxides can be provided with modern laser Raman spectroscopy because of the dependence of the Raman spectrum on the structure of the scattering material. Another goal in his work is to define the relationship between surface oxide structures and their various physical and chemical properties. A better understanding of the synthesis and materials science/solid-state chemistry of the surface oxides is also emerging from this research program. The insight generated from this research has implications for metal oxide catalysts, ceramic materials, pigment materials, and electronic devices which find wide application in the pollution control industry, chemical industry, petroleum industry and the advanced materials industries. Professor Wachs' pioneering research on mixed metal oxide catalysts has been recognized by numerous scientific organizations (AIChE, ACS, EPA and multiple catalysis societies.)


Dr. Jonas Baltrusaitis, Lehigh University

Jonas Baltrusaitis has been utilizing spectroscopy and microscopy techniques since 2004 starting from UHV to the controlled pressures of the reactive gases with emphasis in X-ray spectroscopy for acidic gas adsorption on mineral surfaces. He also performed XPS, FTIR and EDS measurements of complex biomedical systems to investigate metal and metal oxide nanoparticle interactions with live cells. Reactive in situ system development, including controlled relative humidity AFM instrument, is one of his main interests, as well as expanding the application of the scanning probe techniques, such as phase imaging and force spectroscopy, to analyze the dynamics of the complex single crystal mineral surfaces. Recently he has developed methodology for XPS data processing based on the changes systematically induced within the sample. Unlike traditional XPS spectra fitting procedures using purely synthetic spectral components, an XPS data processing method based on vector analysis was developed that allows creating XPS spectral components by incorporating key information, obtained experimentally. His current research interests are in developing catalytic processes for the sustainable use of natural gas and biomass.


High Sensitivity Low Energy Ion Scattering (HS-LEIS) Spectroscopy

The only system of its kind in America, the new Qtac 100 High Sensitivity-Low Energy Ion Scattering (HS-LEIS) spectrometer system, complete with in situ pretreatment chambers, was recently installed at Lehigh University. This new machine utilizes a unique double toroidal electrostatic energy analyzer that provides 3,000 times higher sensitivity than conventional ion scattering spectrometers. Coupled with the existing Scienta ESCA-300 High Resolution-X-ray Photoelectron Spectrometer (HR-XPS) system, Lehigh University possesses unique and sophisticated surface characterization opportunities.

The Qtac100 is the new generation of LEIS instruments. It has been developed to include small spot analysis, surface imaging, and static and dynamic depth profiling, as well as 3000 times higher sensitivy than conventional LEIS instruments. This instrument provides the best quantitative look at the top atomic layer of materials.

For more information on HS-LEIS click here.

NIM Section B, 1992, 68, p207

High Resolution X-ray Photoelectron Spectroscopy (HR-XPS)

The Scienta ESCA 300 is generally regarded as one of the best XPS instruments in operation today. The sample chamber and/or attached chambers provide the ability to heat specimens to >1000°C without the use of electron bombardment, expose surfaces to various vacuum compatible reactant gases, deposit thin films from a precision Knudsen cell and monitor the thickness with a crystal monitor, monitor the vacuum with an RGA, fracture brittle samples in situ, sputter clean surfaces, and scrape surfaces in UHV. The sample entry chamber, which can have base pressures in the low 10 -8 torr range, can be used to carry out experiments at temperatures >400°C at pressures ranging from 10 -8 to 700 torr.

Atomic Force Microscopy (AFM)

In addition to standard surface topology, the electrical and magnetic properties can also be detailed with respect to a materialís surface with the NT-MDT Solver NEXT.