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Chemical Analysis Laboratories
The Chemical Analysis Laboratories (IRSL) is housed in the Research
Center for Science and Technology at Clark Atlanta University. The
main goal of these laboratories is to carry out research involving the
use of infrared spectroscopy, Raman spectroscopy and/or Nuclear Magnetic
Resonance.
INFRARED SPECTROSCOPY
The main instrument for infrared spectroscopy in the IRSL is a Nicolet
Magna 750 FT-IR spectrometer. The main sample compartment of the
instrument can be configured for Near-IR, Mid-IR or Far-IR work, such that
spectra can be measured all the way from 1.1 mm to 200 mm (9,000 cm-1 to
50 cm-1), at a resolution of 0.125 cm-1. This is achieved through
the use of a combination of different sources, beamsplitters, and detectors.
An auxiliary sample compartment with a dedicated fast, liquid-nitrogen
cooled infrared detector is typically dedicated to the in situ study of
catalysts. A Nicolet Nic-Plan microscope with a computer-controlled
positioning stage is also coupled directly to the main interferometer.
In Table 1 are listed the techniques and capabilities which currently exist
in the IRSL for infrared studies. The ASTM methods which apply are
outlined in E1252-94e1. In addition, there are a wide variety of
specific-compound methods outlined in ASTM methods which can be carried
out easily using the equipment in the IRSL.
RAMAN SPECTROSCOPY
Two instruments are available in the IRSL for Raman Spectroscopy.
One instrument is a Nicolet Fourier transform Raman spectrometer (FT-Raman)
which uses a long wavelength Nd-YAG laser for excitation. This technique
has the advantage that materials which fluoresce can be examined using
Raman spectroscopy via this method. The other instrument uses a shorter
wavelength Ar+-ion laser for excitation, either 514 nm or 488 nm currently,
although the other Ar+-ion laser wavelengths are available as well as a
dye laser if appropriate filters are purchased. A 0.5m Spex monochromator
with CCD detector is available for use with the excitation source.
A macro chamber is available for normal samples as well as an Olympus microscope
for micro-Raman studies.
NUCLEAR MAGNETIC RESONANCE
The NMR Laboratory is housed in the Research Center for Research and
technology at Clark Atlanta Universities. The NMR centers main function
it to provide NMR services to the University and Industrial Communities.
In addition, the NMR laboratory provides for the training of students on
the use on our NMR spectrometers.
Instruments / Capabilities
|
Capability / Sample Form
|
Method
|
Instruments
|
| Solids/Powders/Fibers |
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KBr Pellet
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Nujol Mull
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Ambient Diffuse Reflectance
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Controlled Environment Diffuse Reflectance
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Attenuated Total Reflectance (ATR)
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Micro-Reflectance
|
Nicolet Magna 750 FT-IR spectrometer |
| Polymers |
-
Thin Film Transmission
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ATR
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Controlled Temperature ATR
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External Reflectance
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Micro-ATR
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Micro-Reflectance
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Micro-Transmission
|
Nicolet Magna 750 FT-IR spectrometer |
| Liquids |
-
Thin Film Transmission
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ATR
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Controlled Temperature ATR
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Micro-Reflectance
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Micro-ATR
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Micro-Transmission
|
Nicolet Magna 750 FT-IR spectrometer |
| Thin Films |
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Transmission
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ATR
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Controlled Temperature ATR
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External Reflectance
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Micro-Reflectance
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Micro-ATR
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Micro-Transmission
|
Nicolet Magna 750 FT-IR spectrometer |
| Gases |
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Transmission (10 cm gas cell)
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Transmission (2.4m folded path, small volume gas cell)
|
Nicolet Magna 750 FT-IR spectrometer |
| Solids/Powders/Fibers |
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Solids/Powders/Fibers Standard Raman Scattering (Ar+ Ion and dye laser)
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Micro Raman (Ar+ Ion and dye laser)
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FT-Raman (Nd-YAG)
|
Nicolet Fourier transform Raman spectrometer with Nd-YAG laser |
| Polymers |
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Polymers Standard Raman Scattering (Ar+ Ion and dye laser
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Micro-Raman (Ar+ Ion and dye laser)
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FT-Raman (Nd-YAG)
|
Nicolet Fourier transform Raman spectrometer with Nd-YAG laser |
| Liquids |
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Standard Raman Scattering (Ar+ Ion and dye laser)
|
Nicolet Fourier transform Raman spectrometer with Nd-YAG laser |
| Thin Films |
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Standard Raman Scattering (Ar+ Ion and dye laser)
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Micro Raman (Ar+ Ion and dye laser)
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FT-Raman (Nd-YAG)
|
Nicolet Fourier transform Raman spectrometer with Nd-YAG laser |
| Solution 80 MHz 1H and hetero-nuclear NMR |
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User Defined
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ASTM E386-90(1995)
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e1Double resonance
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2-D NMR
|
Bruker AC80 |
| Solution 250 MHz 1H and hetero-nuclear NMR |
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User Defined
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ASTM E386-90(1995)
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e1Double resonance
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2-D NMR
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Bruker WM250 |
| Solution 400 MHz 1H and hetero-nuclear NMR |
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User Defined
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ASTM E386-90(1995)
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e1Double resonance
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2-D NMR
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Bruker ARX400 |
| Solid State 50 MHz NMR 13C and other hetero-nuclear NMR |
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User Defined
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Magic Angle Spinning
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Bruker MSL200 |
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