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preface to fifteenth edition

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SPECTROSCOPY 7.67<br />

TABLE 7.28<br />

Infrared Transmitting Materials<br />

Material<br />

Wavelength<br />

range,<br />

m<br />

Wavenumber<br />

range,<br />

cm 1<br />

Refractive<br />

index at<br />

2 m<br />

NaCl,rock salt 0.25–17 40 000–590 1.52<br />

KBr,potassium bromide 0.25–25 40 000–400 1.53<br />

KCl,potassium chloride 0.30–20 33 000–500 1.5<br />

AgCl,silver chloride* 0.40–23 25 000–435 2.0<br />

AgBr,silver bromide* 0.50–35 20 000–286 2.2<br />

CaF 2 ,calcium fluoride (Irtran-3) 0.15–9 66 700–1 110 1.40<br />

BaF 2 ,barium fluoride 0.20–11.5 50 000–870 1.46<br />

MgO,magnesium oxide (Irtran-5) 0.39–9.4 25 600–1 060 1.71<br />

CsBr,cesium bromide 1–37 10 000–270 1.67<br />

CsI,cesium iodide 1–50 10 000–200 1.74<br />

TlBr-TlI,thallium bromide-iodide<br />

0.50–35 20 000–286 2.37<br />

(KRS-5)*<br />

ZnS,zinc sulfide (Irtran-2) 0.57–14.7 17 500–680 2.26<br />

ZnSe,zinc selenide* (vacuum deposited)<br />

1–18 10 000–556 2.45<br />

(Irtran-4)<br />

CdTe,cadmium telluride (Irtran-6) 2–28 5 000–360 2.67<br />

Al 2 O 3 ,sapphire* 0.20–6.5 50 000–1538 1.76<br />

SiO 2 ,fused quartz 0.16–3.7 62 500–2 700<br />

Ge,germanium* 0.50–16.7 20 000–600 4.0<br />

Si,silicon* 0.20–6.2 50 000–1 613 3.5<br />

Polyethylene 16–300 625–33 1.54<br />

* Useful for internal reflection work.

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