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Wire Grid Polarizers for IR Spectroscopy
September 1st 2013Broadband wire grid polarizer (WGP) products suitable for MWIR and LWIR (mid- and long-wavelength infrared) spectroscopic applications requiring high contrast were developed on thin, AR-coated silicon substrates using Moxtek wafer-scale aluminum Nanowire? patterning capabilities. The Moxtek WGP performance was characterized from the SWIR to LWIR and shows marked improvement over competing WGP products, especially in terms of the contrast ratio between passing and blocking state polarizer transmittance.
Depth Profiling of Complex Samples Using Confocal Raman Microscopy
September 1st 2013Raman microscopy has evolved into a common method for fast and non-destructive analysis of microscopic samples in forensic and R&D laboratories as well as for troubleshooting in the field of quality control. Samples ranging from art & archeology, materials science, biology, pharmacology to polymers and plastics can be investigated.
Identification of Explosives with Handheld Raman Spectroscopy and an Innovative Sampling Technique
September 1st 2013A novel optical focusing method overcomes sampling hurdles associated with Raman devices that are based on a dispersive design. Raster Orbital Scanning (ROS) samples the target materials while maintaining high resolution and minimizing the power buildup of a tightly focused laser typical in Raman applications.
Single Reaction Chamber Microwave Digestion for Specialty Chemicals
February 1st 2013Single reaction chamber microwave digestion enables a chemist to digest up to 15 different specialty chemical samples simultaneously at temperatures as high as 300 ?C, greatly simplifying the workflow while maintaining superior quality digestions.
The miniDOAS: Low Cost, High Performance Contactless Ammonia Measurements
Knowledge of atmospheric ammonia concentrations is important, but ammonia is difficult to measure. We report here on the development of a low-cost ammonia measuring differential optical absorption spectroscopy (DOAS) instrument, based on a small sized and low priced spectrograph.
Microwave Digestion of Pharmaceutical Samples for USP Method
February 1st 2013Pharmaceutical samples spiked with several heavy metals were prepared for ICP-MS analysis using microwave digestion following the protocols in proposed USP chapters <232> and <233>. The results of the spike recovery study are discussed.
Non-Destructive Red Wine Measurement with Dispersive 1064 nm Raman Spectroscopy
February 1st 2013Owing to technological improvements spurred on by the telecommunications boom of the last decade, Raman spectroscopy has become much more accessible to users in all application areas, including agricultural, forensic, pharmaceutical, biomedical, and others.
Eliminating the Trade-Off Between Resolution and Throughput in Raman Spectroscopy
February 1st 2013Although Raman spectroscopy is an excellent analytical tool, Raman signals are often weak and traditional slit spectrometers typically have poor optical throughput, limiting their effectiveness in low light level setups.
Moxtek's ULTRA-LITE X-ray Source
February 1st 2013Moxtek's ULTRA-LITE X-ray source is a very small self contained X-ray source (X-ray tube and high voltage power supply) for use in portable X-ray applications, such as the handheld X-ray fluorescence (XRF) spectrometers. This note demonstrates that this X-ray source has a stable and repeatable X-ray flux output over time, which is vital for the precision of the calibrated XRF measurements.
Improved Sensitivity with the New Apollo XRF ML-50 Detector on the Orbis Micro-XRF Analyzer
February 1st 2013The measurement of trace elements is important across a wide variety of materials characterization problems. When measuring small glass fragments collected from crime and accident scenes, forensics experts analyze trace strontium (Sr) and zirconium (Zr) typically unintentionally incorporated into the glass during manufacturing as one point of identification or comparison.
An Infrared Investigation of Nail Polish Remover Using Multiple Reflection Diamond ATR
February 1st 2013Multiple reflection ATR is ideal for detecting miniscule levels of components in solutions. If one component is volatile, trace analysis can be simplified by allowing the volatile liquids to evaporate.
Single Reaction Chamber Microwave Digestion of Heavy Crude Oil for Trace Metals Analysis
September 1st 2012Single reaction chamber (SRC) microwave digestion offers multiple benefits over traditional dry ashing for the sample preparation of heavy crude oils for trace metals analysis. These include increased sample throughput, reduced risk of contamination, more complete digestion and retention of volatile analytes.
Protein Stability by Chemical Denaturation
September 1st 2012Quantifying protein stability is of fundamental importance in many areas of biomolecular research. The thermodynamic stability of a protein is reflected by a change in Gibbs free energy, ?G?, characterizing the equilibrium transition from a folded state, to an ensemble of unfolded, denatured states. In order to study ?G?, the folding equilibrium needs to be shifted towards the unfolded states which can be achieved by several different methods including the addition of chemical denaturants such as guanidinium chloride (GdnHCl).