ATR Probe & Cells

ATR makes mid–infrared liquid analysis possible. The absorptions corresponding to the fundamental vibrations of most organic chemical fall in the mid–infrared region of the spectrum. However, most of these absorptions are far too strong for practical transmission analysis. ATR solves this problem by providing very short effective pathlengths.11, 12 Axiom has pioneered the application of ATR to a wide range of tasks both in the lab and on the process line14, 15 and holds a number of important patents in this field.1, 2, 3 The company’s laboratory ATR product lines are summarized below. Additional ATR probes are included in the Process Line section of this website.
Overview of Mid-Infrared ATR Products (.pdf)


High Transmission ATR Probes

With the DPR-210 or 212 ATR probe, you can perform rapid FTIR analysis on a wide range of samples with virtually no sample handling.1, 2, 3 Mount the probe in the sample compartment of your spectrometer for easy analysis of liquids, pastes, or slurries. And, clean–up is simple, quick, and free from sample retention. Simply rinse the DPR–210 or 212 with a suitable solvent and wipe it off with a soft towel or brush. Interchangeable ATR elements allow you to optimize performance for most chemical systems.

DPR–210 and DPR-212 Features

  • Easily mounted in any mid–IR spectrometer
  • Dips into any container for rapid sample screening
  • Mates to standard reaction vessels
  • Rapid cleaning with no sample retention
  • Broad spectral response (650 – 4000 cm-1)
  • High transmission

DPR-210 and DPR-212 Data Sheet (.pdf)


Small Diameter ATR Probes

DPR–207 and DMD–270 ATR probes1, 2, 3, 8, 9, 15 feature the small diameter and mounting flexibility required by many research and process development applications. The key to their small diameter and high performance is the use of a single gold lightguide to couple the IR radiation both to the probe tip and back to the instrument. This is combined with a patented design which eliminates stray light due to first surface reflections. For optimum performance, these probes should be used with a liquid nitrogen cooled MCT detector.

DPR–207 and DMD–270 Features

  • Sample compartment or outboard mounting
  • Diamond element for high corrosion resistance (DMD–270)
  • Interchangeable ATR elements to meet diverse requirements(DPR–207)
  • High photometric accuracy and precision
  • Robust Construction

DPR-207 and DMD-270 Data Sheet (.pdf)


ATR Flow Cells

Hellma Axiom’s TNL Series "TUNNEL" ATR flow cells4, 5 set the standard for highly accurate, and yet economical, mid–IR liquid analysis. The patented design of these cells insures that all optical rays passing through the cell experience the same number of reflections and nearly the same angle. This results in a very high degree of photometric accuracy and repeatability.13 In addition, the helical flow characteristics insure rapid sample exchange and cleanout.5

TNL Series Features

  • Rugged, adjustment–free design
  • Cylindrical elements for optimum flow characteristics
  • Absolute repeatability
  • High sensitivity
  • Rapid sample clean out
  • High transmission

TNL Data Sheet (.pdf)


ATR Sampling Capabilities for the Bruker Alpha FTIR Spectrometer

Model SM-Alpha1 is an interface module designed to optimize the performance of the Bruker Alpha FTIR spectrometer for use with the Hellma Axiom ATR probes and other mid-infrared sampling equipment. Its unique optical design features an F:4.5 optical beam geometry, which maximizes transmission while allowing an ATR probe to rotate to any desired orientation. The SM-Alpha1 is interchangeable with standard Bruker QuickSnap™ sampling modules.

SM-Alpha1 Features (when used with the DMD-370 diamond ATR probe)

  • Uses standard DTGS IR detector (no liquid nitrogen required)
  • Extreme chemical resistance (DMD-370)
  • Resistant to extreme temperatures and thermal shock
  • Full fingerprint region spectral coverage

SM-Alpha1 Data Sheet (.pdf)