Spectra have been obtained with the Infrared Spectrograph ( IRS) on the Spitzer Space Telescope for 20 sources in the Lockman Hole field of the SWIRE survey. The sample is divided between sources with indicators of an obscured AGN, based primarily on X-ray detections of optically faint sources, and sources with indicators of a starburst, based on optical and near-infrared spectral energy distri...

The attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) was employed to acquire the infrared spectra of Radix Bupleuri and its unofficial varieties: the root of Bupleurum smithii Wolff and the root of Bupleurum bicaule Helm. The infrared spectra and spectra of Fourier self-deconvolution (FSD), discrete wavelet transform (DWT), and probability neural network (PNN) of t...

Vibrational analysis of triflic acid (TfOH) at different water uptakes was conducted. This molecule mimics the sulfonate end of the Nafion side-chain. As the proton leaves the sulfonic acid group, structural changes within the Nafion side-chain take place. They are revealed by signal shifts in the infrared spectrum. Molecular modeling is used to follow structural modifications that occur during...

We report on the development of a microelectromechanical systems (MEMS)-scale photoacoustic sensor for the detection of trace gases. A mid-infrared quantum cascade laser (QCL) was used to determine detection limits for acetic acid, acetone, 1,4-dioxane, and vinyl acetate. The source was continuously tunable from 1015 cm(-1) to 1240 cm(-1), allowing for the collection of photoacoustic vibrationa...

Hyperspectral images are 3D data sets collected over an x, y grid, where the pixel at each x, y is composed of a spectrum. In hyperspectral unmixing, such a data set X composed of n observed spectra with p wavelengths or spectral bands is decomposed to identify the pure component spectra. Such data sets are found in airborne land imaging studies, biomedical and art history investigations as wel...

Spatially resolved Fourier transform infrared (FT-IR) spectroscopy of single oral mucosa cells and FT-IR spectroscopy of liver cell fractions produced by sucrose density gradient centrifugation have been applied to acquire structural information of cell organelles. For the spatially resolved measurements, mapping as well as mercury cadmium telluride (MCT) focal plane array (FPA) detector techni...

We have developed two automated detectors that can recognize the sulfate mineral jarosite in unknown visible to near-infrared spectra (350– 2500 nm). The two detectors are optimized for use within the terrestrial and martian atmospheres. The detectors are built from Support Vector Machines trained using a generative model to create linear mixtures of library mineral spectra. Both detectors perf...

We have studied by laboratory infrared spectroscopy the profile of the CO2 absorption bands in different H2O:CH3OH:CO2 mixtures. Icy mixtures have been accreted on a substrate at 12.5 K inclined of 45 degrees with respect to the infrared beam of the spectrometer. Spectra have been taken with the electric vector of the infrared beam parallel (P polarized) and perpendicular (S polarized) to the p...

We have obtained mid-infrared spectra of nine cool-core galaxy clusters with the Infrared Spectrograph aboard the Spitzer Space Telescope. X-ray, ultraviolet and optical observations have demonstrated that each of these clusters hosts a cooling flow which seems to be fueling vigorous star formation in the brightest cluster galaxy. Our goal is to use the advantages of the mid-infrared band to im...

BACKGROUND & AIMS Infrared spectroscopy is an increasingly common method for bacterial strains' testing. For the analysis of bacterial IR spectra, advanced mathematical methods such as artificial neural networks must be used. The combination of these two methods has been used previously to analyze taxonomic affiliation of bacteria. The aim of this study was the classification of Escherichia col...