Raman Spectroscopy
Sciencetech Raman Spectroscopy
Overview
Raman spectroscopy and Infrared (IR) spectroscopy are the two primary techniques to determine the vibrational modes of molecules. To a large extent these are complementary in that they measure two distinctly different physical phenomena. Infrared spectroscopy involves the measurement of absorption of light corresponding to transitions between the molecular energy levels of the vibration modes of molecules. In Raman Spectroscopy a monochromatic visible light beam is scattered by the molecules.
This scattered light is measured with a suitable spectrometer, usually at 90 degrees to the incident beam. A change in the scattered frequency with respect to the source is related to the vibrational frequencies of molecules. At the very most, the intensities of Raman lines are 0.001 % of the source. Lasers are the standard sources with Argon ion lasers being the most commonly used. Sciencetech offers several Raman spectrometers suited for different needs and budgets, ranging from single channel double monochromators to multichannel, triple monochromator systems with versatile multimode instruments.
Sciencetech Raman Spectroscopy System RM-9040DA
The RM-9040DA is a complete modular system, specially designed for educational and research purposes. The 9040DA allows the study of solid, liquid and gas samples with a variety of sample attachments. With its very low stray light level and high resolution, measurements very close to the Raman Line can be achieved making such determinations as the rotational modes of air molecules possible.
The Raman Spectroscopy RM-9040DA includes
Ar ion laser (optional or customer supplied), air cooled, fixed or switchable at 488 nm or 512 nm with power supply.
Laser focusing optics onto the sample with optimization alignment adjustments. Sample chambers: Gas and liquid cells
as well as a solid sample holder. The swap from the solid sample holder to the liquid holder and vice versa is very
simple. The system maintains alignment when either sample chamber is reinstalled. Light tight enclosure for the all
compartments. Filter holder with Notch filter and coupling optics to the monochromator with completely light tight
enclosure.
All components are achromatic in vibration free mounts and holders. 9040DA double additive half-meter
spectrometer. This instrument has been specially designed for Raman Applications and special care has been taken to
eliminate stray light. This also includes a light tight enclosure as well as special baffles, gaskets, division wall
between the two monochromator sections and special mounts for mirrors and gratings. Photomultiplier detector system
with high sensitive PMT tube. The Sciencetech PMH-02 room temperature housing is standard, or the optional PMH-04
thermoelectric cooled housing is available. Data acquisition board with 16 bits A/D, programmable gain. SciSpec software
package for Windows. Optical base for the sample chamber, laser and the monochromator.
| Model |
Description |
Price |
|
RM9040-DA |
Full Raman Spectroscopy System |
P.O.R |
|
RM-250
RM-500
RM-900 |
Other Raman System |
P.O.R |
Other Single Channel Spectrometer Systems for Raman Spectroscopy
Raman Spectroscopy RM-250 System Consists of:
Sample chamber, Double additive monochromator, and Photomultiplier detector.
The double monochromator
9055DA in this system works in additive mode. Dispersed light exiting the first monochromator is dispersed
again with both dispersions in the same direction. The 9055DA is a double 1/4 meter monochromator with
resolution optimized for 500-700nm, corresponding to the wavelengths of most of the lasers used as Raman
sources. It uses holographic gratings to minimize stray light.
Raman Spectroscopy RM-900 System Consists of:
Sample chamber with coupling optics, X-Y stage for alignment control. 1 meter double additive monochromator (Sciencetech 9490DA). Photomultiplier detector system. All electronics for motor control and data acquisition with optical computer. The 9490DA is an optimized Czerny Turner with a focal length of 914mm. It features manual and automatic grating control, kinematic holographic gratings for low stray light, scanning in nm or cm-1, multiple entrance and exit ports, and microprocessor controller with microstep.
