optical spectroscopy Articles

  • 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, Inc.

  • Optical couplers: key hardware for high quality FTIR spectroscopy

    Description Optical couplers are used to take the light coming from the source of a FTIR and route it through the sampling accessory and into the FTIR detector. This is an essential process in the effective use of the FTIR spectrometer. Therefore, optical couplers play an essential role in the proper use and maintenance of a FTIR system. Recognizing the importance of optical couplers ...


    By CIC Photonics, Inc.

  • 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, Inc.

  • 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

  • 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

  • Surface optical modes in GaN nanowires

    We investigate the optical phonons in crystalline GaN nanowires using Raman spectroscopy. Reduced phonon lifetime in the nanostructures is attributed to the increased anisotropy in lattice vibrations. Apart from the group theoretically allowed optical phonons, new phonon modes around 652 cm−1 and 691 cm−1 have been observed. In view of its good agreement with values in GaN, the ...


    By Inderscience Publishers

  • Optical Remote Sensing in the United States

    Recent studies that involve the use of optical remote sensing (ORS) techniques to measure gaseous and particulate pollutants have rekindled interest among environmental researchers and regulators in this decades-old technology. This article describes some of the key research and development projects that are helping restore ORS-based methods to the list of currently available emissions ...


    By Arcadis

  • Optical in situ characterisation of carbon nanotube growth

    In situ optical characterisation of carbon nanotube growth is reported. The nanotubes are grown on a micro–scale heater using chemical vapour deposition (CVD). Optical emission is used to characterise the temperature of the small–scale heater prior to and during growth and to monitor any temperature changes due to the interaction of the growing nanotubes with the cold gas atmosphere. In situ ...


    By Inderscience Publishers

  • Optimising next-generation lithium ion batteries with infrared spectroscopy

    Lithium batteries have become the mainstay of modern portable electronics, providing a reliable power source to run mobile phones, laptop computers and electric vehicles. Lithium technology is now even being developed on a large scale to provide electricity storage to supplement the National Grid during peak demand [1]. The issue with lithium batteries remains the same – energy density ...


    By Specac Limited

  • Raman ‘optical biopsy’ of human breast cancer

    Abstract Raman imaging (RI) is a novel method of medical diagnostics of human breast cancer and has a potential to become a routine optical biopsy. Up to date the present study is the most statistically reliable Raman analysis based on data of normal, benign, and cancerous breast tissues for 146 patients. This paper present the first Raman ‘optical biopsy’ images of the ...


    By AcuTech Scientific Inc.

  • The effects of hydrogen on the electrical and optical properties of ZnO

    Hydrogen atoms introduced into oxides are considered to modify the electronic structure of the compounds. The effect of hydrogen on the electrical and optical properties of zinc oxide (ZnO) films was examined. The electronic state of hydrogen-doped ZnO films was studied by Ultraviolet Photoelectron Spectroscopy (UPS) and cathode luminescence measurements. Hydrogen introduced in ZnO forms impurity ...


    By Inderscience Publishers

  • Erbium–doped nanoparticles in silica–based optical fibres

    Developing of new rare–earth (RE)–doped optical fibres for power amplifiers and lasers requires continuous improvements in the fibre spectroscopic properties (like shape and width of the gain curve, optical quantum efficiency, resistance to spectral hole burning and photodarkening...). Silica glass as a host material for fibres has proved to be very attractive. However, some potential ...


    By Inderscience Publishers

  • On the possible optical resonance in carbon nanotubes based cavities

    An enhanced interference phenomenon in the IR absorbance-wavenumber profiles of ship-shaped carbon nanotubes powder has been observed by attenuated total reflection at room temperature. This room temperature interference phenomenon was considered as possibly originating from an optical resonance effect and that single carbon nanotubes could act as individual Fabry-Perot or Lummer-Gehrcke resonant ...


    By Inderscience Publishers

  • Deposition temperature effects on optical and structural properties of amorphous silicon carbide films

    Hydrogenated amorphous silicon carbide thin films (a–SiC:H) were elaborated by DC magnetron sputtering technique by using 6H–SiC as target. The a–SiC:H films of 0.9–1.5 µm thicknesses were deposited at different temperatures of 250, 350, 450 and 550°C on p–type Si(100) and Corning glass 9075 substrates. The deposited films (a–SiC:H) were investigated by Infrared Spectroscopy (FTIR), ...


    By Inderscience Publishers

  • On the Application of Open-Path Fourier Transform Infrared Spectroscopy to Measure Aerosols: Observations of Water Droplets

    ABSTRACT This paper proposes the application of Open-Path Fourier Transform Infra-Red (OP-FTIR) spectroscopy to measure aerosols. A preliminary experiment conducted in a standard shower chamber generated a condensed water aerosol cloud. The OP-FTIR beam acquired spectra through the ...


    By Arcadis

  • Effect of functionalisation of MWCNTs on optical and morphological properties of MEH–PPV/MWCNTs nanocomposites

    The effect of functionalisation of Multi–Walled CNTs (MWCNTs) as a way to ameliorate their dispersion has been quantified. Two kinds of nanocomposites have been elaborated, using a spin–coating as deposition technique: poly (2–methoxy–5–(2–ethyhexyl–oxy)–p–phenylenevinylene) (MEH–PPV) as an electron donor, pristine MWCNTs and polystyrene–functionalised MWCNTs (PS:MWCNTs) as electron acceptors. ...


    By Inderscience Publishers

  • Low level moisture measurement in Natural gas using a Lunable diode laser absorption spectroscopy (tdlas) based laser case study

    Introduction The measurement of water vapor in natural gas has long been of industrial importance, and has been addressed by a variety of analytical techniques over the years. Chief among these techniques has been the quartz crystal microbalance (QCM) based analyzers. The QCM technology is still the workhorse for production and pipeline applications, and the technique is considered by most ...

  • Structural, optical and photo catalytic properties of Cu–doped ZnO nanoparticles synthesised by co–precipitation method

    In this work, co–precipitation method was utilised to synthesise Cu–doped ZnO nanoparticles using zinc nitrate (Zn(NO3)2·6H2O), and copper(II) nitrate trihydrate (Cu(NO3)2·3 H2O) ...


    By Inderscience Publishers

  • The determination of major and minor elements in air filters and urine for hazard assessment, using a new CCD DUAL-VIEWED ICP optical emission spectrometer

    This article describes the application of a new type of CCD-based, dualviewed ICP optical emission spectrometer for the analyses of industrial hygiene types of samples. Several trace elements in air filter media are determined by ICP-OES. Urinary electrolytes and trace elements are determined in a single dilution automatically in both the axial and radial plasma viewing orientations. Results of ...


    By PerkinElmer, Inc.

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you