FTIR Attenuated Total Reflectance (ATR)

Attenuated total reflection (ATR) is a method that allows the direct measurement of samples for FTIR

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Attenuated total reflection (ATR) is a method that allows the direct measurement of samples for FTIR. ATR method involves pressing the sample against a high-refractive-index prism and measuring the infrared spectrum using infrared light that is totally internally reflected in the prism. A diamond, zinc selenide (ZnSe) or germanium (Ge) prism is used in the ATR accessory. Most ATR accessories use a single bounce design, where the IR radiation interacts with the sample only once. Horizontal ATRs (HATRs) would interact with the sample up to 45 times increasing the signal, but use a larger amount of sample.

ATR accessories can be used to measure a wide variety of samples; however, spectra can change based on the amount of pressure or have a small shift based on the crystal material. Shimadzu’s LabSolutions IR Software offers a ATR correction to correct for the interactions from the crystal material.

Additional precautions must be taken for quantitative measurements using an ATR. Due to the minor shifting of peaks with an ATR accessory, the intensity of a peak alone cannot be used for quantitation.

 

FTIR - Spectrum of PET, ZnSE crystal - germanium crystal

Available Models

FTIR ATR Accessories - QATR-S

QATR-S

  • Compatible Models: IRSpirit-T, IRSpirit-L
  • Available crystal materials: Diamond (High Through Put), Germanium, Zinc Selenide
  • Types of measurable samples: Powders, solids, films, liquids

 

FTIR ATR Accessory: QATR-10

QATR-10

  • Compatible Models: IRXross, IRTracer-100, IRAffinity-1S
  • Available crystal materials: Diamond (Extended Range), Diamond (High Through Put), Germanium, Zinc Selenide
  • Types of measurable samples: Powders, solids, films, liquids

 

FTIR ATR Accessory: MIRacle - 10

MIRacle-10

  • Compatible Models: IRTracer-100, IRAffinity-1S
  • Available crystal materials: Diamond, Germanium, Zinc Selenide
  • Types of measurable samples: Powders, solids, films, liquids

 

FTIR ATR Accessory: HATR-10

HATR-10

  • Compatible Models: IRXross, IRTracer-100, IRAffinity-1S
  • Available crystal materials: Germanium, Zinc Selenide, KRS-5
  • Types of measurable samples: Different sample holder for liquids and solids required

 

FTIR ATR Accessory: Golden Gate

Golden Gate

  • Compatible Models: IRXross, IRTracer-100, IRAffinity-1S, IRSpirit-T, IRSpirit-L
  • Available crystal materials: Diamond, Diamond with Zinc Selenide, Germanium with Zinc Selenide
  • Types of measurable samples: Powders, solids, films, liquids

 

FTIR Accessory: Gateway Horizontal ATR Accessory

Gateway Horizontal ATR Accessory

  • Compatible Models: IRXross, IRTracer-100, IRAffinity-1S, IRSpirit-T, IRSpirit-L
  • Available crystal materials: ZnSe
  • Types of measurable samples: Different sample holder for liquids and solids required
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