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64 . RamanStation 400 Series Getting Started Guide
Acquiring Spectra with the Fiber Optic Probe
The standard Raman fiber optic probe has a tight focus spot that is approximately 7.5 mm
away from the lens. The focused spot enables you to pinpoint the measurement area on the
sample.
Sampling Solids
Solids can be analyzed by mounting the probe on a stand and adjusting the focal spot on the
surface of the sample. Whenever possible, powders should be compacted down and thin
films of materials should be folded so that the sample covers the entire depth of field. Solids
can be analyzed in glass and plastic containers, similar to liquid samples.
NOTE: Raman spectra are measured in the visible and near infrared region. Room lighting
and sunlight will contaminate your spectra. Take care not to misinterpret room
lighting or sunlight features as sample features.
If using a RamanStation 400F, and a fiber optic probe or RamanMicro 300 Accessory
is connected, ensure that the probe or microscope objectives are covered (or, if
fitted, that the microscope enclosure is closed) and that the microscope illumination
is off and the switch is set to Dark Field (DF) when using the sample compartment to
prevent contamination.
Sampling Liquids
Liquid samples can be analyzed by immersing the FOP in the liquid of interest or by analyzing
through the container.
Immersion
The FOP can only be immersed in liquid if you have purchased an immersible fiber probe
sleeve. Do not totally submerge the probe. It is only acceptable to immerse the probe up to
1 inch from the top of the sleeve. It may be useful to focus the sample by sliding the FOP
inside the immersion sleeve to obtain the best spectrum. Note that immersion sleeves
contain either quartz or sapphire windows, these windows can yield a detailed Raman
spectrum – do not confuse this with the spectrum of the sample.
Figure 31 Fiber Optic Probe with the immersion sleeve detached
Immersion sleeve
Fiber optic probe
Summary of Contents for RamanStation 400 Series
Page 1: ...RamanStation 400 Series Getting Started Guide MOLECULAR SPECTROSCOPY ...
Page 5: ...Introduction ...
Page 10: ...10 RamanStation 400 Series Getting Started Guide ...
Page 11: ...Safety Practices ...
Page 27: ...Raman History Theory and Instrumentation ...
Page 34: ...34 RamanStation 400 Series Getting Started Guide ...
Page 35: ...Preparing Your Facility ...
Page 39: ...Installing Your RamanStation 400 Series ...
Page 52: ...52 RamanStation 400 Series Getting Started Guide ...
Page 53: ...Introduction to the RamanStation 400 Series ...
Page 59: ...Fiber Optic Probe ...
Page 66: ...66 RamanStation 400 Series Getting Started Guide ...
Page 67: ...Using the RamanStation 400 ...