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Raman System Selection
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Raman
System Selection Guide
Raman spectroscopy
is quickly becoming one of the preferred
chemical identification techniques in many
application areas. Raman is advantageous because
it is:
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Non-invasive: Sample through glass and
pastic
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Non-destructive: Sample can be reused
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Fast: Typical measurement times 5-30 seconds
Raman
spectroscopy provides rapid and reliable
non-destructive chemical analysis of aqueous
solutions, powders, tablets, gels and surfaces.
A basic setup consists of a monochromatic
source, typically a laser, which interacts with
the sample. The scattered radiation is then
collected by a spectrometer. We offer several
options for using Raman as a measurement tool:
QE65000
Modular Raman System, Click Here
The QE65000
Scientific-grade Spectrometer was designed for
low-light level applications such as Raman
spectroscopy. You have several grating and
entrance aperture sizes from which to choose to
optimize a system for your specific application.
In
Raman
System Selection Guide
addition, we have lasers and Raman probes to
complete your own modular Raman setup.
Turnkey
Raman Systems, Click Here
We offer
several Raman turnkey sensing systems from our
partner, Raman Systems, Inc. Their
high-performance systems are designed
specifically for quick material identification
and verification in almost any setting.
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PinPointer™
Pinpointer, the "Point-Click"
solution designed specifically for quick
material identification and verification on
the go and for various field deployments.
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PeakSeeker™
The PeakSeeker by Raman Systems is
our most practical and easy-to-use Raman
spectrometer. It is an excellent choice for
users who want a full featured Raman
spectrometer but have a limited budget.
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PeakSeeker Pro™
The PeakSeeker Pro represents the
state-of-the-art for an accurate, cost-effective
and easy-to-use Raman spectrometer. The
premier instrument in the Raman Systems line
utilizes TE-cooled, high efficiency CCD
detector arrays, and is available with
either a 532 nm or 785 nm laser.
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RAM-LR Laser
A stabilized diode laser (at 785 nm)
provides an ideal narrow linewidth
excitation source for Raman spectroscopy
using CCD detectors. The laser can be
controlled through software and has all the
laser Class IIIb safety features.
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RSM Microscope
The Raman Systems RSM Video Raman
Microscope is an upright laboratory
microscope that couples to a Raman Systems
spectrometer (sold separately). The
accessory is supplied with a Reflected Light
Illuminator and a USB Color Video Camera.
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MSK Microscopy Kit
The MSK Raman Microscopy Kit from
Raman Systems turns an upright laboratory
microscope into a video Raman spectroscope.
The kit includes a Raman Beamsplitter Module
that mounts below the eyepiece assembly and
a USB Color Video Camera that mounts above
the eyepiece.
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MMS-Raman,
Click Here
Centice
Corporation offers their Multimodal Multiplex
Spectroscopy Raman System to provide high
performance chemical analysis for a fraction of
the cost of research-grade systems. Due to its
high sensitivity and great resolution, the
MMS-Raman is an ideal system for substance
verification and accurate concentration
analysis, as well as for analysis of very
low-concentration samples.
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Raman
Application Areas
Raman spectroscopy is
useful for analyzing molecules without a permanent
dipole moment, which does not show up on an IR
spectrum. Raman spectroscopy is used to determine
bond lengths in non-polar molecules. It is useful
for determining the identity of organic and
inorganic species in solution, as the Raman
transitions for these species are more
characteristic than for IR, where the transitions
are much more affected by the other species present
in the solution. Raman can be used to analyze solid,
liquid and gaseous sample components even through
glass and plastic containers.
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- Art: Pigments,
inks, substrates, resins
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- Biology: in vivo
studies, surface studies, SERS
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- Catalysts: NO
decomposition, kinetics of hydrogenation
reactions
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- Corrosion:
corrosion kinetic studies, bronze, aluminum
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- Forensics:
drugs, explosives, pigments, powders, tablets,
gels and surfaces, chemicals
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- Materials:
diamond films, semiconductors, nanotubes,
asbestos, materials ID
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- Pharmaceuticals:
in situ crystal growth monitoring, kinetics,
active ingredients, polymorphs differentiation
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- Polymers:
polymerization monitoring, plasticizer studies,
density mapping of films
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- Process: online
monitoring, quality control, research
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- Other: gemology,
geology, chemical and petrochemical processes,
water-quality analysis
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Next-generation
Raman
Spectroscopy
We've
teamed
with
Centice
Corporation
to offer
next-generation
Raman
spectroscopy
that
combines
the
simplicity
of
dispersive
instruments
with the
multiplex
advantage
of a
transform
spectrometer.
The
MMS-Raman
Spectrometer
uses
Centice's
patent-pending
Multimodal
Multiplex
Spectroscopy
to
provide
high-performance
Raman
analysis
for a
fraction
of the
cost of
research-grade
systems.
The
MMS-Raman
Spectrometer
offers a
unique
combination
of
resolving
power,
spectral
range
and
flexibility,
making
it an
ideal
system
for the
routine
analysis
of many
types of
liquids
and
solids.
How
Multimodal
Multiplex
Spectroscopy
Works
Dispersive,
fixed-grating
spectrometer
designs
typically
use a
slit or
a fiber
as the
input
into the
spectrometer.
These
apertures
restrict
the
amount
of light
that can
reach
the
detector.
In these
designs,
there is
an
inherent
tradeoff
between
resolution
and
light
throughput.
While
spectral
resolution
increases
as slit
width
decreases,
a narrow
input
slit
limits
the
light
throughput
and,
likewise,
measurement
sensitivity.
In the
MMS-Raman
Spectrometer,
a
wide-area
coded
aperture
takes
the
place of
a
traditional
slit
entrance
that
allows
10-1000x
greater
light
throughput
-- and
then
applies
precise
algorithms
to
extract
a high
resolution
spectrum
from the
collected
light.
There is
much
more
light
collected,
without
sacrificing
resolution.
Multimodal
Multiplex
Spectroscopy
instruments
are
ideal
for
measuring
weak,
scattering
and
diffuse
samples
because
the
spectrometer
can
collect
and
process
far more
light
through
its
wide-area
aperture,
without
affecting
spectral
resolution.
Key
Applications
Key
applications
include
material
inspection,
identification
of
unknown
materials,
and
quantitative
analysis
of both
intermediates
and
final
products
in the
chemical
and
pharmaceutical
industries.
Typical
samples
include
powders,
liquids
and
polymers.
All
experimental
and
parameter
set-up
options
are
computer-controlled
for
increased
ease of
use,
reliability
and
speed.
Integrated
Sample
Holder
The
MMS-Raman
Spectrometer
has a
sample
holder
with
cover
for
operation
in full
ambient
light
without
affecting
performance.
The
spectrometer's
removable
sample
compartment
is
integrated
into the
optical
path,
avoiding
inefficiencies
associated
with
remote
compartments.
Sample
positioning
is rapid
and
precise
using
the
external
z-axis
alignment
control
knob.
The
sample
compartment
is
especially
useful
for
measuring
measure
weak,
scattering
and
diffuse
sources
with the
highest
possible
sensitivity.
The
sample
holder
supports
up to
10-mm
cuvettes
and test
tubes.
MMS-Raman
Delivers
Great
Sensitivity
&
Resolution
The
MMS-Raman
spectrometer
samples
up to
1,000
optical
channels
simultaneously
through
the
large
coded
aperture.
A
mathematical
transformation
algorithm
precisely
reconstructs
the
spectrum
with a
4x
signal-to-noise
improvement
as
compared
with a
slit-based
system
equipped
with
identical
source,
grating
and
detector
components,
and
70-80x
greater
than
with a
fiber
input of
equivalent
resolution.
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Specification
SYSTEM
Wavelength range: 220 cm-1 to 2000 cm-1
Spectral resolution: ~4 cm-1
Grating: Transmissive
Stray light: <0.1%
Integration time: 50 ms to 100 seconds
A/D resolution: 16-bit
APERTURE AND DETECTOR
MMS aperture size: 0.58 mm x 2.3 mm
Detector array size: 512 x 122 pixels
Number of active pixels: 62,464
Pixel size: 24 μm x 24 μm
Well depth: ~300,000 electrons
Quantum efficiency: 85% at 250 nm
Dark noise: 300 e-/pixel/sec @ 0° C
Readout noise: 2 RMS counts, 8 RMS electrons
Gain: 4.7
Detector temperature: To -20 °C below ambient
LASER
Excitation wavelength: 785 nm
Laser power: 70 mW at sample
SAMPLE CHAMBER
Cuvettes: Square, up to 10 mm
Test tubes: Up to 17 mm
COMPUTER
Interface: USB 2.0
Operating systems: Windows XP (with SP2)
RAM requirements: 12 MB
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Special
Instrument
