Presented spectrometer allows to conduct express and routine measurement of Raman spectra. The complex has the ability to measure liquids and solid samples: glassy, crystalline, organic and inorganic substances in the form of powders, thin films, and can work with microquantities of the substances. The complex has a system of optical imaging of the samples - Olympus. The spectrometer is equipped with three lasers with wavelengths of 488, 532, 785 nm, and fiber-optic sensor for registering the spectra of samples in an external sample compartment.
Main features
- - Spectrometer is located on a platform of the confocal optical microscope and it has a class I protection from laser radiation.
- - Spectral range of recording the Raman spectra of 80-4500 cm-1.
- - Spectral resolution: better than 3 cm-1.
- - Calibration wavelength: continuous, throughout the process of registration of the spectrum.
- - Wavelength of the excitation laser (in parentheses the maximum power is shown): 532 nm (20mW), 785 nm (100 mW), 488 nm (40 mW).
- - Detection: High-sensitive CCD detector with a Peltier-cooling to -70оС.
- - 2 diffraction gratings – 400 grooves/mm and 1200 grooves/mm.
- - Polarizer for measurements in polarized light.
- - Fiber-optic sensor for recording the spectra of samples in an external sample compartment.
Characteristics of the confocal microscope with the visualization device
- - Spatial resolution – 1 mm.
- - The confocal optics with hybrid iris controled by computer.
- - Aperture: combined slotted aperture for high luminosity and round aperture for confocal measurements.
- - Confocal a resolution 2 microns.
- - Color CCD camera to visualize the viewpoint, with a resolution 1.3 megapixel.
- - Trinocular head for optical lenses with different degrees:
- - 20x (working distance – 1.3 mm),
- - 50x (working distance – 0.38 mm),
- - 4x, 10x, 50x (long-focus),
- - 100x (operating distance – 0.9 mm).
- - Stage: an automated, controled with joystick and software, movement range – 75 mm x 50 mm, movement accuracy – 0.1 mkm.
Software features
The software kit for the spectrometer control allows to diagnosethe operating capacity of the optical system, the registration of spectra, measured data processing with special software packages:
- - Identification with the optimization function of the spectrum.
- - Implementation of univariate and multivariate analyzes.
- - Conducting the routine analysis.
- - Three-dimensional visualization of spectral data.
- - Identification of the substance using the library search, the ability to build their own spectral libraries.
- - The function of the spectrum intensity correction.
- - Automatic fluorescence rejection of the laser with a wavelength of 785 nm.
- - Library of the Raman scattering spectra.
Fields of application
Typical applications of Raman spectroscopy in materials science and nanotechnology.
- - Materials for the study of any type of inorganic and organic materials, including semiconductor elements.
- - In gemology, mineralogy for the study of gems, minerals.
- - In organic chemistry for the study of reaction mechanisms of synthesis and characterization of the products.
- - The development and control of various production processes.
- - In criminology, Raman spectroscopy can be used to identify:
- - paints, inks (car accident, identification of the figure),
- - polymer films, different fibers, shot, glasses,
- - explosives, drugs, toxic substances,
- - the composition of explosive mixtures of powders.
- - In the pharmaceutical industry in the development and production control tablet forms of drugs and creams.
- - Determination of lattice defects.
- - The study of corrosion processes.
