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Raman Spectroscopy

Raman Spectroscopy System

Raman spectroscopy and Infrared (IR) spec- troscopy 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 transi- tions between the molecular energy levels of the vibration modes of molecules. In Raman Spectroscopy a monochro- matic 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 budg- ets, ranging from single channel double monochromators to multichannel, triple monochromator systems with versatile multimode instruments.

 

Model

Description

Price (USD)

RM9040-DA

Full Raman spectroscopy system

P.O.R

RM-250, RM- 500 & RM-900

Other Raman System

P.O.R

Sciencetech Raman 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 sam- ples 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 de- terminations as the rotational modes of air molecules pos- sible.

 

The Raman RM-9040DA includes:

 

  1. Ar ion laser (optional or customer supplied), air cooled, fixed or switchable at 488 nm or 512 nm with power supply.
  2. Laser focusing optics onto the sample with optimization alignment adjustments.
  3. 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 rein- stalled.
  4. Light tight enclosure for the all compartments.
  5. 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.
  6. 9040DA double additive half-meter spectrometer.  This instrument has been specially designed for Raman Ap- plications and special care has been taken to eliminate stray light. This also includes a light tight enclosure as well as spe- cial baffles, gaskets, division wall between the two mono- chromator sections and special mounts for mirrors and gratings.
  7.   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.
  8. Data acquisition board with 16 bits A/D, programmable gain.
  9. SciSpec software package for Windows.
  10. Optical base for the sample chamber, laser and the monochromator.
 RM9040-DA Full Raman Spectroscopy System

The 9040DA includes:

  • Input, intermediate and output adjustable slits up to 30 mm in height. All slits are micrometer activated with easy access to adjust width and height.
  • Holographic gratings, mounted in kinematic mounts for easy replacement.
    • Stepper motor with a microprocessor controller.

 

  • User selectable scanning, done linearly in energy (cm-1, eV, etc.) or wavelengths (nm, mm, A).

The 9040DA can also be fitted with one of Sciencetech's photodiode array detectors or cooled CCDs.

 

OTHER SINGLE CHANNEL SPECTROMETER SYSTEMS FOR RAMAN

RM-250 system consists of:

  1. Sample chamber
  2. Double additive monochromator
    1. 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.

 

RM-900 system consists of:

  1. Sample chamber with coupling optics, X-Y stage for alignment control.
  2. 1 meter double additive monochromator (Sciencetech 9490DA).
    1. Photomultiplier detector system.

    D. All electronics for motor control and data acqui- sition with optional 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. Please refer to page 3-22 for more information.

Multichannel Systems:

Multichannel Raman spectroscopy offers many ad- vantages for the user: It allows the recording of a large por- tion of the spectrum at once. Routine acquisition can be reduced from minutes and even hours to a few seconds. As a consequence of this fact other advantages arise:

  • • Decrease in noise, due to decrease in light fluctuations during the much shorter acquisition time.
  • • Increase in sensitivity due to the possibility of longer integration times.
  • • Decrease in background variations and sample deterioration.
 
 

RM-500 system consists of:

  1. Sample chamber with coupling for laser and filter mono- chromator, X-stage for alignment control
  2. Double monochromator (1/4 meter) 9055D in subtractive mode.
  3. Sciencetech 9040 dispersive high resolution monochro- mator.
    1. Dual detector system (optional).
      1. Photon counting photomultiplier (PMT);       ii.1024 element Photodiode array detector (PDA) or CCD.
      2. All electronics for motor control and data acquisition.
      3. Software for control of gratings, data acquisition and display.
        1. Optional computer.

In this system, a double monochromator first sepa- rates a selected wavelength segment out of the incoming radiation. The segment is then passed onto a spectrograph stage where is dispersed over the multichannel detector sensitive area. Optional dual detector operation with flipping mirror allows the selection of the additional port in spectro- graph for photomultiplier detection.

 

Camera features

Photodiode array detector system. 1024 elements, 25µm each. Detection range 200-1050nm. Specifications with 9040 monochromator:

Spectral coverage: 26 nm, 980 cm-1(@1800 l/mm, 514 nm)

(1024 elements) 78 nm,

2940 cm-1 (@600 l/mm, 514 nm)

Camera resolution: 0.026nm, 1cm-1(@1800 l/mm, 514 nm)

(25µm elements) 0.077 nm, 3 cm-1 (@600 l/mm, 514 nm)