Bayesian Hamiltonian Selection in X-ray Photoelectron Spectroscopy

X - Ray Photoelectron Spectroscopy of Silicate Glasses

X-ray photoelectron spectroscopy (XPS) is a powerful technique capable of providing unique information about the structural chemistry of glasses. However, inappropriate procedures for the preparation of sample surfaces or the lack of reliable methods to overcome electrostatic charging effects during analysis of dielectric materials can cause spurious features to be introduced or intrinsic featu...

Surface and core hole effects in X-ray photoelectron spectroscopy

Soft X-ray Photoelectron Spectroscopy in Silicon Clathrate Superconductors

Silicon clathrate compounds consist of fullerenelike polyhedral Si-cages, which share their faces to form a three-dimensional Si-sp 3 covalent network. Guest elements such as an alkali atom or an alkaliearth one can be encapsulated in the cage. Recently, these compounds have attracted strong interest due to the discovery of superconductivity in a metal-doped silicon clathrate, Ba6Na2Si46 [1], a...

X-ray induced damage in DNA monitored by X-ray photoelectron spectroscopy.

In this work, the chemical changes in calf thymus DNA samples were analyzed by X-ray photoelectron spectroscopy (XPS). The DNA samples were irradiated for over 5 h and spectra were taken repeatedly every 30 min. In this approach the X-ray beam both damages and probes the samples. In most cases, XPS spectra have complex shapes due to contributions of C, N, and O atoms bonded at several different...

Highly sensitive nitric oxide detection using X-ray photoelectron spectroscopy.

Nitric oxide (NO) is important physiologically as a gaseous messenger in the central nervous system;1 its level is also associated with several disease states.2 The concentration of NO in these cases is in the nanomolar range; therefore accurate and direct detection of NO at these levels is important. NO is also a decomposition product of several explosives3 so detection of trace amounts of exp...