SPP ATR Plates

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Harrick Scientific offers single-pass parallelepiped for ATR spectroscopy in a variety of optical materials. We stock SPP ATR crystals in Si, Ge, ZnSe and ZnS, as listed below. We welcome the opportunity to quote on other sizes and materials to meet your needs.

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
EJ3111 SPP Plate Ge 45º 50 x 20 x 1 mm N/A
EJ3112 SPP Plate Ge 45º 50 x 10 x 1 mm N/A
EJ3121 SPP Plate Ge 45º 50 x 20 x 2 mm $568.00
EJ3122 SPP Plate Ge 45º 50 x 10 x 2 mm $600.00
EJ3131 SPP Plate Ge 45º 50 x 20 x 3 mm $638.00
EJ3132 SPP Plate Ge 45º 50 x 10 x 3 mm $529.00
EJ3135 SPP Plate Ge 45º 25 x 10 x 3 mm N/A
EJ3211 SPP Plate Ge 60º 50 x 20 x 1 mm $438.00
EJ3212 SPP Plate Ge 60º 50 x 10 x 1 mm $486.00
EJ3221 SPP Plate Ge 60º 50 x 20 x 2 mm $568.00
EJ3222 SPP Plate Ge 60º 50 x 10 x 2 mm $486.00
 
Model No. Product Price
EE3111 SPP Plate Si 45º 50 x 20 x 1 mm N/A
EE3112 SPP Plate Si 45º 50 x 10 x 1 mm N/A
EE3121 SPP Plate Si 45º 50 x 20 x 2 mm $520.00
EE3122 SPP Plate Si 45º 50 x 10 x 2 mm N/A
EE3131 SPP Plate Si 45º 50 x 20 x 3 mm $551.00
EE3132 SPP Plate Si 45º 50 x 10 x 3 mm N/A
EE3135 SPP Plate Si 45º 25 x 10 x 3 mm N/A
EE3197 SPP Plate Si 45º 10 x 5 x 0.5 mm $125.00
EE3211 SPP Plate Si 60º 50 x 20 x 1 mm $514.00
EE3212 SPP Plate Si 60º 50 x 10 x 1 mm $503.00
EE3217 SPP Plate Si 60º 10 x 5 x 1 mm $138.00
 
Model No. Product Price
EI3117 SPP Plate ZnS 45º 10 x 5 x 1 mm $132.00
EI3123 SPP Plate ZnS 45º 50 x 5 x 2 mm $396.00
EI3197 SPP Plate ZnS 45º 10 x 5 x 0.5 mm N/A
EI3232 SPP Plate ZnS 60º 50 x 10 x 3 mm $575.00
 
Model No. Product Price
EM3111 SPP Plate ZnSe 45º 50 x 20 x 1 mm N/A
EM3112 SPP Plate ZnSe 45º 50 x 10 x 1 mm N/A
EM3121 SPP Plate ZnSe 45º 50 x 20 x 2 mm N/A
EM3122 SPP Plate ZnSe 45º 50 x 10 x 2 mm $514.00
EM3125 SPP Plate ZnSe 45º 25 x 10 x 2 mm N/A
EM3131 SPP Plate ZnSe 45º 50 x 20 x 3 mm N/A
EM3132 SPP Plate ZnSe 45º 50 x 10 x 3 mm $546.00
EM3135 SPP Plate ZnSe 45º 25 x 10 x 3 mm N/A
EM3232 SPP Plate ZnSe 60º 50 x 10 x 3 mm N/A
IR Optical Materials for SPP-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.