SPT ATR Plates

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

Ready to place an order? Need Help? Please call Customer Service at 1-800-248-3847, or click on the button below to send us an email.

 
Model No. Product Price
EJ2111 SPT Plate Ge 45º 50 x 20 x 1 mm N/A
EJ2117 SPT Plate Ge 45º 10 x 5 x 1 mm $180.00
EJ2121 SPT Plate Ge 45º 50 x 20 x 2 mm N/A
EJ2122 SPT Plate Ge 45º 50 x 10 x 2 mm $499.00
EJ2132 SPT Plate Ge 45º 50 x 10 x 3 mm N/A
EJ2211 SPT Plate Ge 60º 50 x 20 x 1 mm N/A
EJ2221 SPT Plate Ge 60º 50 x 20 x 2 mm N/A
HON-LSP-J Ge Horizon Trough $915.00
HON-SSP-J Ge Horizon Solid Sampling Plate $940.00
 
Model No. Product Price
EE2111 SPT Plate Si 45º 50 x 20 x 1 mm N/A
EE2121 SPT Plate Si 45º 50 x 20 x 2 mm N/A
EE2122 SPT Plate Si 45º 50 x 10 x 2 mm $528.00
EE2132 SPT Plate Si 45º 50 x 10 x 3 mm N/A
 
Model No. Product Price
EI2111 SPT Plate ZnS 45º 50 x 20 x 1 mm N/A
EI2121 SPT Plate ZnS 45º 50 x 20 x 2 mm N/A
EI2122 SPT Plate ZnS 45º 50 x 10 x 2 mm N/A
 
Model No. Product Price
EM2211 SPT Plate ZnSe 60º 50 x 20 x 1 mm N/A
EM2111 SPT Plate ZnSe 45º 50 x 20 x 1 mm $495.00
EM2121 SPT Plate ZnSe 45º 50 x 20 x 2 mm $531.00
EM2122 SPT Plate ZnSe 45º 50 x 10 x 2 mm $524.00
EM2132 SPT Plate ZnSe 45º 50 x 10 x 3 mm N/A
EM2221 SPT Plate ZnSe 60º 50 x 20 x 2 mm N/A
EM2222 SPT Plate ZnSe 60º 50 x 10 x 2 mm N/A
HON-LSP-M ZnSe Horizon Liquid Sampling Plate $930.00
HON-SSP-M ZnSe Horizon Solid Sampling Plate $915.00
IR Optical Materials for SPT-ATR Plates
  n KH
(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

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.