spectroscopy Articles

  • Reducing NOx in Diesel Emissions | Spectroscopy Solutions

    Air pollution and NOx emissions from diesel engines are a global concern due to their potential impacts on human health. Researchers worldwide are developing new and improved methods to reduce NOx emissions. Infrared spectroscopy in the gas phase, which is made possible using FTIR gas cells from Specac, has an important role to play in this ...


    By Specac Limited

  • FTIR Spectroscopy

    Fourier Transform Infrared (FTIR) Spectroscopy bases its functionality on the principle that almost all molecules absorb infrared light. Only the monatomic (He, Ne, Ar, etc) and homopolar diatomic (H2, N2, O2, etc) molecules do not absorb infrared light. Molecules only absorb infrared light at those frequencies where the infrared light affects the dipolar moment of the molecule. In a molecule, ...


    By CIC Photonics

  • Polarized spectroscopy for combustion analysis | Spectroscopy Solutions

    Combustion is a crude but effective method of releasing energy from the environment. Even in more technical applications, such as inside automobile engines, gas turbines and power plants combustion is the central process. Polarized FTIR spectroscopy can filter out background radiation when ...


    By Specac Limited

  • Analyzing gemstones using infrared spectroscopy | Spectroscopy Solutions

    The demand for gemstones is increasing, and fraudulent gemstones are becoming a prominent and difficult-to-tackle problem in the gemstone and jewelry industries. Fake, synthetic, and enhanced gemstones can be identified quickly and with confidence using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). ...


    By Specac Limited

  • Analyzing gas using transmission spectroscopy | Spectroscopy Guides

    How can transmission spectroscopy analyze a gas sample? Like many other samples, a gas (or vapour) can be analyzed using the transmission of an infrared beam through the sample, reading the strength of the various wavenumbers upon exiting the sample and arriving at a detector. ...


    By Specac Limited

  • What is XRF? | Spectroscopy Guides

    X-ray Fluorescence (XRF) is a technique widely used in elemental analysis. It is based on the principle that an atom's inner electrons, when bombarded with high energy radiation such as X-rays, are ejected. The atom relaxes by emitting photons of characteristic wavelengths, which are used to identify the element.  If diagrams do not animate, try ...


    By Specac Limited

  • Beginners Guide to Spectroscopy - Transmission

    This is the first part of our introduction to Spectroscopy, more can be found on our blog (http://specac.blogspot.co.uk). Introduction Transmission spectroscopy is the oldest and simplest technique for analysing samples in infrared. This ...


    By Specac Limited

  • Encoded photometric infrared spectroscopy

    General Principle The EP-IR system contains the encoder-spectrograph, as well as a real-time embedded micro-processor for signal analysis, data treatment, and Chemometrics (quantitative) analysis in a single small-footprint enclosure. Operation Principle An infrared polychromatic beam is emitted from an external source (e.g. glow bar) onto the sample. Then ...


    By CIC Photonics

  • Analyze wine using ATR-FTIR spectroscopy | Spectroscopy Solutions

    Wine analysis using spectroscopy Within quality assurance and process monitoring practices, spectroscopy has been widely used for many years1. Increasingly spectroscopic techniques and advanced data processing are being adopted for authenticity testing.2 Such verification is particularly important in the wine industry, which provides a premium-priced ...


    By Specac Limited

  • Ultrafast laser spectroscopy of semiconductor nanocrystals

    Ultrafast laser spectroscopy is an efficient tool for investigation of ultrafast processes in nanostructures. We have been involved in the picosecond and femtosecond laser spectroscopy of semiconductor nanocrystals since the mid–1990s. This paper aims to review some of our results and to illustrate the potential of ultrafast laser spectroscopy in the research of semiconductor ...


    By Inderscience Publishers

  • What is a pellet die? | Spectroscopy Guides

    A pellet die is a simple tool used to form thin cylindrical pellets from a powder using a pellet press. At its simplest, a pellet die consists of a hollow cylindrical body capped at one end, ...


    By Specac Limited

  • Nanoholes in metals with applications to sensors and spectroscopy

    In this paper, we review our experimental and theoretical investigations of nano-holes in metal films. Our first contribution to this field was to demonstrate experimentally that the shape of the holes in arrays could be used to influence the optical properties; in particular, we showed how to control the polarisation with elliptical nano-holes. A theory explaining this shape-effect was presented ...


    By Inderscience Publishers

  • Nanoparticles and nanowires: synchrotron spectroscopy studies

    This paper reviews the research in nanomaterials conducted in our laboratory in the last decade using conventional and synchrotron radiation techniques. While preparative and conventional characterisation techniques are described, emphasis is placed on the analysis of nanomaterials using synchrotron radiation. Materials of primary interests are metal nanoparticles and semiconductor nanowires and ...


    By Inderscience Publishers

  • XRF cement analysis | Spectroscopy Solutions

    Cement is a primary building material in the modern world; as a major constituent of buildings, concrete structures and roads the consistency of its composition during production is essential. ...


    By Specac Limited

  • KBr pellet faults | Spectroscopy Guides

    Generally, it is easy to produce a good quality KBr pellet if a decent Evacuable Pellet Die is used correctly, in conjunction with an appropriate Hydraulic Press. However, some faults in the produced sample ...


    By Specac Limited

  • Using Spectroscopy for Used Oil Analysis

    Evaluating the wear condition of equipment is a primary requirement of condition monitoring programs. Oil wetted equipment will generate wear particles throughout its lifetime, the nature and rate of the wear varies from initial ...


    By Spectro Scientific

  • Environmental testing with XRF | Spectroscopy Solutions

    Monitoring of inorganic environmental pollutants is an ongoing challenge for analytical chemists. To establish the quality of different compartments of our environment (atmosphere, indoor air, water basins, soil, biota) in general a relatively large number of samples must be taken from a given location over the entire duration of sampling.29,30,31 ...


    By Specac Limited

  • FTIR products explained | Spectroscopy Guides

    FTIR range available from Specac At Specac, we produce a diverse selection of FTIR spectroscopy accessories, which can fit in a range of spectrometers. Primarily an optics company with a long history of meeting the needs of both industrial and laboratory customers, Specac's spectrometer accessories have been designed with ...


    By Specac Limited

  • The basics of polarization (animated) | Spectroscopy Guides

    In many spectroscopic and photonics applications, it is desirable to work with light that has been polarized in a particular direction. In this article we explore what polarization is, and how it may be obtained from an unpolarized light source. Electro-magnetic radiation (light) What we generally refer to as “light” is more correctly known as 'electromagnetic ...


    By Specac Limited

  • Rotating angled plate diffusing wave spectroscopy

    Solid–like non–ergodic samples can be difficult to study using standard single speckle diffusing wave spectroscopy as the measurement may lack requisite ensemble averaging. We demonstrate here that this required ensemble averaging can be induced by translating the speckle over the collection optics so that multiple speckles are observed over the duration of the experiment. Translation is achieved ...


    By Inderscience Publishers

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