Infrared absorption spectroscopy for quantitative analysis of alkane gases has been widely used in the fields energy exploration, geological survey, coal-bed methane analysis, and atmospheric environment monitoring. With rapid development science technology, various research have put forward higher requirements on detection accuracy limits gas analysis. Spectral pretreatment is very important i...

Silicon Drift Detectors (SDDs) consist of a fully depleted volume in which an electric field drives signal charges to a small sized anode. Due to their topology SDDs combine a large sensitive area with a small output capacitance. In an advanced SDD version for X-ray spectroscopy designed and fabricated at the MPI semiconductor laboratory the input transistor of the amplifying electronics has be...

The importance of explicitly resolving the Stokes drift in ocean surface modelling is demonstrated by comparing four models with 58,612 observational data points obtained from undrogued drifting buoys Estuary and Gulf St. Lawrence, Canada. Drift model inputs are regional atmosphere circulation, spectral wave models. control considers near-surface currents provided top grid cell circulation mode...

In situ time-resolved spectroscopic examination of catalysts based on well dispersed nanoparticles on metal oxides under transient conditions significantly facilitates the elucidation of reaction mechanisms. In this contribution, we demonstrate the level of structural information that can be obtained using high-energy resolution off-resonant spectroscopy (HEROS) to study 1.3 wt% Pt/Al2O3 and 1....

Diffuse reflectance spectroscopy with a fiber optic probe is a powerful tool for quantitative tissue characterization and disease diagnosis. Significant systematic errors can arise in the measured reflectance spectra and thus in the derived tissue physiological and morphological parameters due to real-time instrument fluctuations. We demonstrate a novel fiber optic probe with real-time, self-ca...

Many magnetic equilibrium states and phase transitions are characterized by fluctuations. Such fluctuation can in principle be detected with scattering-based x-ray photon correlation spectroscopy (XPCS). However, the established approach of XPCS, scattering signal is quadratic cross section, which results not only often prohibitively small signals but also a fundamental inability to detect nega...

Hematite is a suitable precursor to obtain catalytically active iron (oxide) phases for CO2 Fischer-Tropsch synthesis after reductive pretreatment. As concluded from in situ Raman spectroscopy, hydrogen atmosphere the transformation α-Fe2O3 Fe3O4 faster than further reduction Fe (metallic iron). The rate of these steps highly depends on temperature. Starting pure hematite, surface formate speci...

Title of Dissertation: DEVELOPMENT AND APPLICATIONS OF MULTIFREQUENCY IMAGING AND SPECTROSCOPY METHODS IN DYNAMIC ATOMIC FORCE MICROSCOPY Gaurav Chawla, Doctor of Philosophy, 2011 Dissertation directed by: Assistant Professor Santiago D. Solares, Department of Mechanical Engineering Force spectroscopy and surface dissipation mapping are two of the most important applications of dynamic atomic f...