The use of VPH technology to manufacture Raman gratings also offers reduced polarization dependence and minimization of internal scatter to suppress background arising from scattered light in the optical bench. This is combined with Littrow configurations for the detection scheme to ensure good focusing at all wavelengths on the full detector range to improve resolution and detection efficiency. Wasatch Photonics’ Raman spectrometers and systems make use of our patented volume phase holographic (VPH) gratings, which offer much greater transmission efficiencies than standard surface relief gratings while also achieving excellent spectral resolution. Many of Wasatch Photonics’ instruments contain gratings suitable for recording Raman spectra over a broader spectral range, up to 5000 cm -1. Typically, a Raman grating is optimized for the desired wavelength range, with the fingerprint range (up to 1500 cm -1) being considered the minimum for analysis. The more lines/mm, the better the spectral resolution, but this also limits the working spectral range of grating, so there is a compromise to be made for what is best for required measurements. The dispersion of a Raman grating depends on the number of ruled or imaged lines per millimeter (lines/mm or lpmm). The Optimal Raman GratingĪnother key component for determining the spectral resolution of a Raman spectrometer is the dispersive grating used for detection. Therefore Wasatch Photonics allows customization of their spectrometers with a variety of slit sizes tailored to customers’ needs to balance the expected throughput with desired resolution. A narrower slit will result in a higher resolution spectrum but will limit the light throughput. There are several key components that determine the ultimate spectral resolution. This scattered light is collected, and often focused, onto a grating to disperse the spectrum into its wavelength components before it is focused onto a detector for recording. Resolution DeterminationĪ Raman measurement works by exciting the sample of choice with a laser beam of a given wavelength and monitoring the resulting Raman scattered light. Wasatch Photonics offer an extensive range of Raman instruments and many of those come with customizable slit widths, a key factor in determining the energy resolution of the final measurements. The resolution of the Raman spectrometer is therefore very important when working with different types of samples. Depending on the energetic separation of the vibrational modes, this can lead to a large amount of spectral congestion, where different vibrational bands overlap and cannot be resolved. Larger molecular systems have more vibrational degrees of freedom, often resulting in more peaks in the Raman spectra. The Raman spectrum provides information on chemical bonds in a system and can be used to identify which functional groups are present in a molecule, as well as the concentration of a species (with the correct calibrations). No.Raman spectroscopy is an excellent tool for qualitative and quantitative analysis of a variety of chemical compounds and materials. If you want a new game key just click on the “ Get It Free” button and follow the simple instructions. List of legit free Steam keys for our users.
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