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Holmarc

HO-ED-S-06A Laser Raman Spectrometer

$11,250.00

Laser Raman Spectrometer

(CCD Based)

Holmarc's CCD Based Laser Raman Spectrometer apparatus (Model No: HO-ED-S-06A) is an apparatus designed for recording Raman spectra of both solids and liquid samples. Raman spectroscopy is a scattering technique. It is based on Raman Effect, i.e., frequency of a small fraction of scattered radiation is different from frequency of monochromatic incident radiation.

It is based on the inelastic scattering of incident radiation through its interaction with vibrating molecules. It probes the molecular vibrations. This will produce a different range of frequencies, namely intense stokes and anti stokes, which have higher frequency than the incident radiation along Rayleigh line. Rayleigh and Raman scattering can be explained both classically and quantum mechanically.

In CCD based Raman spectrometer, sample is kept in cuvette accompanied by the mechanical chamber with DPSS laser (532nm). The vibrational state of molecule while relaxing the high energy state re-emits the radiation in all directions. Spectrometer is positioned in such a way that laser beam collide at the cuvette perpendicularly. Notch filter is used in front of the spectrometer to avoid Rayleigh scattering so that Raman radiations are measured efficiently.

Czerny Turner design is applied in the spectrometer with precision holographic grating as dispersion element. The control electronic devices convert the optical dispersion to electronic pulses which is transmitted to computer via USB.

The software used to interpret the data is user friendly. Regression / curve fit algorithms ( Newton - Raphson numerical analysis, Levenberg Marquardt algorithms, etc ) are used. Savitzky - Golay filtering / Box car smoothing purposes, etc are the features of the software. Material library is provided for customized versions.

Experiment:

  •     Raman spectrum study of solid and liquid samples like TiO2, CeO2, Sulfur, Urea, Cyclohexane, CCl4, etc

Specifications - Spectrometer:

  Design     Czerny Turner design
    Type     Plane grating
    Lines / mm     1200 l/m
    Wavelength range     538 nm to 598 nm *
    Raman Shift range     210 cm-1 -  2000 cm-1
    Wavelength accuracy     < 0.4 nm
    Wavelength repeatability     < 0.2 nm
    Laser     532nm, 40mW DPSS laser
    Notch filter wavelength     532 nm
    CWL tolerance (nm)     +/- 5.3 nm
    Calibration source used     Mercury lamp
    Calibration type     Regression / curve fitting

CCD:

 CCD detector     High sensitive CCD detector 3648 element
    Signal to noise ratio     500 : 1
    A/D resolution     12 / 16 Bit
    Exposure time     0.1 - 6500 ms

Features:

  Computer-controlled, user-friendly interface
    Automatic recording of Raman spectra
    DPSS laser is used as light source
    Both solid and liquid samples can be analyzed

Drawings:

Click HERE for video