EKHI

Materials

Curve 1

Temperature K: 298 Wavelength Range, µm: 2.50-20.0 Geometry θ θ': ~0° Reported Error, %: 2π Composition (weight percent), Specifications, and Remarks: Ultra pure (impurities<80 ppm) powder (4 mm thick) on aluminum flat; data extracted from smooth curve.

Wavelength / 𝜇m	Reflectance /
2.5	0.994
2.7	0.978
2.86	0.932
3.0	0.918
3.15	0.91
3.31	0.916
3.45	0.906
3.62	0.961
3.98	0.966
5	0.949
5	0.953
5.43	0.957
5.59	0.962
5.88	0.93
6.8	0.926
7.09	0.904
7.75	0.926
9.09	0.927
10.6	0.93
14	0.909
17.5	0.895
20.0	0.898

Curve 2

Temperature K: 573 Wavelength Range, µm: 2.50-20.0 Geometry θ θ': ~0° Reported Error, %: 2π Composition (weight percent), Specifications, and Remarks: 99.9 pure powder (4 mm thick) on aluminum flat; data extracted from smooth curve.

Wavelength / 𝜇m	Reflectance /
2.5	0.951
2.81	0.933
2.86	0.923
2.92	0.906
3.11	0.901
3.22	0.893
3.34	0.901
3.44	0.904
3.76	0.897
5.0	0.883
5.0	0.887
5.65	0.856
5.95	0.846
6.1	0.83
6.25	0.778
6.37	0.79
6.71	0.789
6.94	0.796
7.19	0.767
7.35	0.725
7.41	0.673
7.52	0.736
7.69	0.771
8.0	0.78
8.47	0.694
8.85	0.586
9.26	0.525
9.35	0.522
9.9	0.561
10.7	0.666
11.3	0.701
11.6	0.693
11.9	0.719
12.8	0.71
13.5	0.731
14.2	0.74
15.6	0.727
16.6	0.715
17.5	0.715
19.2	0.697
20.0	0.697

Curve 3

Temperature K: 298 Wavelength Range, µm: 2.50-20.0 Geometry θ θ': ~0° Composition (weight percent), Specifications, and Remarks: 99.9 pure powder (4 mm thick) on aluminum flat; data extracted from smooth curve.

Wavelength / 𝜇m	Reflectance /
2.5	0.924
2.72	0.922
2.8	0.772
2.87	0.747
3.03	0.719
3.23	0.726
3.44	0.759
3.69	0.787
4.24	0.799
5.0	0.804
5.0	0.809
5.59	0.775
5.88	0.761
6.21	0.725
6.33	0.704
6.41	0.675
6.58	0.707
6.8	0.707
7.04	0.71
7.25	0.673
7.41	0.604
7.52	0.69
7.75	0.76
7.94	0.769
8.2	0.736
8.7	0.596
9.09	0.539
9.35	0.521
9.9	0.561
10.6	0.646
11.3	0.702
11.6	0.689
11.9	0.71
12.5	0.698
12.8	0.694
13.5	0.719
15.8	0.71
16.3	0.699
16.6	0.711
19.2	0.677
20.0	0.634

High Purity Powdered Csl as a High Reflectance Infrared Diffuser