Multiloop-MIR Fiber Optic ATR Probes

This MultiLoop-MIR™ system is perfect for analyzing liquids, pastes, and soft solids outside of the FTIR spectrometer sample compartment. These multiple reflection ATR probes are used in conjunction with the Harrick FiberMate2™ or other fiber optic coupler.  The MultiLoop-MIR™ includes one CIR and one PIR fiber optic probe, each with a set of five disposable loop tips. This combination is designed for spectral measurements across the entire mid-infrared region. To analyze a sample, simply dip the ATR loop tip into the sample or press it gently against the sample.

MultiLoop-MIR Short Wavelength Kit
Chalcogenide (CIR) fiber optic probe
Model No.
MultiLoop-MIR Long Wavelength Kit
Silver Hailide (PIR) fiber optic probe
Model No.
MultiLoop-MIR Combination Kit
Chalcogenide (CIR) and Silver Halide (PIR) fiber optic probes
Model No.
NOTE: A Model No. ending in "XXX" denotes spectrometer code.

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  • Multiple reflection ATR sampling outside the FTIR spectrometer.
  • Effectively provides two reflections when compared to ATR with ZnSe at 45°.
  • Wavelength range: 6500 cm-1 to 600 cm-1:
    • Chalcogenide glass probe for use from 6500 to 1450 cm-1.
    • Polycrystalline Silver halide probe for use from 2000 to 600 cm-1.
  • Sampling tips designed for the 6500 to 600 cm-1 spectral range:
    • Dip into or press against the sample.
    • Leak-free for analysis of liquids.
    • Readily replaceable.
    • Made from silver halide fiber material.
  • Easy to use.
  • Suitable for aqueous solutions and organic samples.
  • Standard probe length of 1 meter allows sampling outside the spectrometer sample compartment.
  • MCT detector recommended.
  • SMA connectors for easy connection to fiber optic couplers.
  • Operable from room temperature to 100°C.
  • Use with the Harrick FiberMate2™ fiber optic coupler for purged operation in most FT-IR spectrometers.
  • MultiLoop-MIR™ Mid-IR Set for the entire mid-IR
    • Silver Halide Probe.
    • Chalcogenide Probe.
    • Ten Silver Halide Tips.
  • MultiLoop-MIR™ Silver Halide Probe Set (2000 to 600 cm-1)
    • Silver Halide Probe.
    • Five Silver Halide Tips.
  • MultiLoop-MIR™ Chalcogenide Probe Set (6500 to 1450 cm-1)
    • Chalcogenide Probe.
    • Five Silver Halide Tips.
Model No. Product Description Price
FM2-XXX FiberMate2

Fiber optic coupler

Model No. Product Price
FOP2-C05 MultiLoop-MIR CIR Probe Tips, Set of 5 $462.00
FOP2-P05 MultiLoop-MIR PIR Probe Tips, Set of 5 $462.00
FOP2-PRT Covers for MultiLoop-MIR Probe $115.00
Model No. Product Description Price
IRS-671 Internal Reflection Spectroscopy by N.J. Harrick $0.00
IRS-V24 Infrared and Raman Spectroscopy of Biological Materials Edited by Hans-Ulrich Gremlich And Bin Yang $251.00

Figure 1. MultiLoop-MIR™ installed on the FiberMate2.

Infrared fibers combined with high performance FTIR spectrometers now make it possible to offer a fiber optic system for use with the TGS and optional MCT FTIR detectors..  The MultiLoop-MIR, features two fiber optic probes with readily replaceable sampling tips.  The silver halide (PIR) probe operates over the fingerprint region, from 2000 to 600 cm-1, while the chalcogenide (CIR) probe covers the 6500 to 1450 cm-1 region. The probes connect to Harrick’s FiberMate2 fiber optic coupler using SMA connectors.  The probe tips are affixed onto the end of the probes to provide a leak-free assembly that can be dipped into or pressed gently into liquid, pastes, and soft solids.  These tips are the only part of the system that comes in contact with the sample and are easily replaced as needed.

The MultiLoop-MIR effectively provides two reflections from the sample as compared to single reflection 45º ZnSe ATR.  It has excellent throughput for infrared fiber optics, allowing data collection with a DTGS detector, although an MCT detector is highly recommended for best performance.

Several examples are shown below using the MultiLoop-MIR with the FiberMate2.  These measurements were recorded with 64 scans at 8 cm-1 resolution using a DTGS detector.  The entire mid-infrared spectrum was measured using the two fiber probes.  The CIR probe was used for 4000 cm-1 to 1520 cm-1 and the PIR probe for the 1530 cm-1 to 600 cm-1 region. The spectra were baseline corrected and joined together to show the full spectral range.

Figures 2 and 3 show spectra of three different liquids. The two children's analgesics shown in Figure 2 are clearly distinguishable from each other in the fingerprint region. The spectrum of a wine sample (Figure 3) shows characteristics from the organic component of the grapes, in addition to the strong aqueous bands.

Figures 4 and 5 demonstrate using the MultiLoop-MIR™ for solid sampling. The silicone rubber tape is soft and flexible, so good contact was readily obtained between the sampling tip and the tape, as shown by the strong band intensities. The peak intensities in Figure 5 are much weaker, indicating that the contact with this sample was not as good. Yet the spectrum is clearly identifiable as polyester. Note: pressing the sampling tip against solid samples reduces the lifetime of the tip and is only recommended for use with soft solids.

The MultiLoop-MIR™ provides a quick and easy method for quantitative and qualitative in-situ analysis of liquids, pastes, and soft solids within one meter of the spectrometer.

Figure 2. ATR Spectra of Children's Liquid Pain-Relievers Motrin (black) and Tylenol (blue).

Figure 3. ATR Spectrum of Kouros White Wine.

Figure 4. ATR Spectrum of Silicone Rubber Tape.

Figure 5. ATR Spectrum of a Plastic Toy Fish. and Water (lower).