ATR Plates

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Harrick Scientific offers single-pass trapezoids for parallelepiped infrared ATR spectroscopy. SPT and SPP ATR crystals are available in Si, Ge, ZnSe. Our stock sizes are listed below. We welcome the opportunity to quote on other sizes and materials to meet your requirements.

IR Optical Materials for SPP-ATR Plates

 nKH

(psi)
MOR*

(psi)
useful range cm-1 (μm)chemical properties
Windows

1-2mm
IRE

70mm
Ge 4.0 550 7000 5000-600

(2.0-17)
5000-900

(2.0-11.4)
Insoluble in water, soluble in hot H2SO4, aqua regia
Si 3.42 1150 9000 10,000-100

(1.0-100)
9500-1500; 350-FIR (1.06-6.7 30-FIR) Insoluble in most acids and bases; soluble in HF and HNO3
ZnS 2.22 355 10,000 22,000-750

(0.45-14.0)
14,000-1000

(0.7-10)
Soluble in acid; insoluble in water
ZnSe 2.42 150 8000 20,000-500

(0.5-20)
20,000-700

(0.5-14.3)
Soluble in strong acids; dissolves in HNO3
n: Refractive IndexKH: Knoop HardnessMOR: Rupture Modulus

ATR Plates Specifications

ATR Specs

The dimension of an internal reflection (ATR) element (IRE) is given by its length (l), width (w), and thickness (t). The length of the IRE, measured from the center of the entrance aperture to the center of the exit aperture, determines the number of reflections, N.

N = ( l / t ) tan θ

If l is kept constant, plates of a different thickness can be exchanged without the necessity of realigning the accessory.

Note that for l = 50 mm and θ = 45° degrees, the tip-to-tip length, l ( t - t ) = l + t. This length is 52 mm for t = 2 and 51 mm for t = 1 mmm.

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