Raman

Raman Spectroscopy Page
Last updated: 20210317 mtim

Raman Spectroscopy is a molecular vibration technique and is used in a wide variety of applications.
The sample is excited by laser of a certain wavelength and the inelastically scattered photons from the sample are collected and delivered to a CCD Array detector.
The resulting spectra is a fingerprint of the sample under test.
Raman is complimentary to FTIR. FTIR is sensitive to non symetric molecules, Raman is sensitive to symetric bonds.

Raman can be used to measure:
Raman shift, Photoluminescence, Crystal Lattice vibrations, Temperature, Stess

Raman Applications:
Materials, Life, Chemical, Earth & Analytical sciences.
Materials Science Applications: Carbon, 2D Materials, Nanotechnology, Photovoltaics, Battery Technology, Semiconductors and Catalysis.

Instrument Specifics:
Renishaw Invia Reflex Raman Confocal Microscope
Standard Operting Procedure (PDF)

This is a fully automated confocal Raman microscope system with three laser excitation lines a motorized stage and open sample compartment to accommodate cryostats.
A Temperature controlled microscope stage is available for temperature dependent measurements.

Raman Reflex Beampath

Data Acquisition Modes:
Point Mapping, Imaging - Stream HR fast imaging, Depth Profiling, Polarization, Time Dependent, Temperature Dependent, Photoluminescence

Laser Sources:
473nm                        25mw
532nm                        50mw (With Computer Controlled Linear Polarizer)
785nm                        100mw, Bar Laser
The laser power changed using computer controlled neutral density filters

Detector:
1” CCD array, Deep Depletion for enhanced IR Range
400-1050nm, 1024 X 256 pixel

Holographic Reflectance Gratings:
600l/mm, 1200l/mm, 2400l/mm

Rayleigh Filters:
473nm edge                        10%@150cm-1 shift
532nm eclipse (Notch)         <15cm-1 shift, Stokes & Antistokes
532nm edge                        ~100cm-1shift
785nm edge                        10%@50cm-1 shift

Microscope:
Leica Optical Microscope
Infinity Corrected, 200mm Tube Length, semi parfocal objectives
Free Space with linterlocked (laser safe) enclosure
External Reflected Light

Objectives: Semi par-focal
Objective       Opening        WD                 NA

10X                 4mm               12mm             0.25
LWD50X        2mm               8mm               0.50
50X                 4mm               350um            0.75
LWD100X      2mm               ~3mm             0.75
100X               2mm               0.1mm            0.90
External Microscope Lamp, Reflected Light Polarization

Microscope Stages:
Renishaw HSES motorized stage
Step Size: 100nm, Stage Travel: 112mm x 76mm

Rotating Microscope Stage - for polarization experiments

Temperature controlled Microscope Stage
Linkam THMS600  (-196deg C to 600deg C).

Macro Sampling Set:
Cuvettes, Powders , Capillaries, Etc.

Software:
Renishaw Wire 4,4 ,(Software available to users for data analysis)
Spectral Reference Libraries - Organic Polymers, Inorganic materials, Sample substrates

Computer & Monitor, HP Computer, Monitor 22”
 

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Kaiser Hololab 5000 Modular Research Raman Microscope & Spectrometer (Retired)

785nm, 400mw Solid State Laser
Range: 200 to 3400 Raman shift
Leica DLMP Optical Microscope
Objectives: 10X, 50X, 100X, LWD50X
Macro Sampling Accessory
Calibration Accessory