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This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (September 2007) Caesium iodide IUPAC name Caesium iodide Identifiers CAS number 7789-17-5 Y ChemSpider 23003 Y EC-number 232-145-2 Jmol-3D images Image 1 SMILES [Cs+].[I-] InChI InChI=1S/Cs.HI/h;1H/q+1;/p-1 Y Key: XQPRBTXUXXVTKB-UHFFFAOYSA-M Y InChI=1/Cs.HI/h;1H/q+1;/p-1 Key: XQPRBTXUXXVTKB-REWHXWOFAA Properties Molecular formula CsI Molar mass 259.81 g/mol Appearance white crystalline solid Density 4.51 g/cm3, solid Melting point 621 °C Boiling point 1277±5 °C Solubility in water 44 g/100 ml (0 °C) Refractive index (nD) 1.739 Structure Crystal structure CsCl Space group Pm3m, No. 221 Lattice constant a = 456.67 pm Coordination geometry Cubic (Cs+) Cubic (I−) Hazards EU Index not listed Flash point non-flammable Related compounds Other anions Caesium fluoride Caesium chloride Caesium bromide Other cations Lithium iodide Sodium iodide Potassium iodide Rubidium iodide  Y(what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references Caesium iodide (American English: Cesium iodide) (CsI) is an ionic compound often used as the input phosphor of an x-ray image intensifier tube found in fluoroscopy equipment. An important application of caesium iodide crystals, which are scintillators, is electromagnetic calorimetry in experimental particle physics. Pure CsI is a fast and dense scintillating material with relatively high light yield. It shows two main emission components. One in the near ultraviolet region at the wavelength of 310 nm and one at 460 nm. The drawbacks of CsI are a high temperature gradient and a slight hygroscopicity. Caesium iodide can be used in Fourier Transform Infrared (FT-IR) spectrometers as a beamsplitter. CsI has a wider transmission range than the more common potassium bromide beamsplitters, extending usefulness into the far infrared. A problem with optical-quality CsI crystals is that they are very soft with no cleavage, making it difficult to create a flat polished surface. Also, the CsI optical crystals must be stored in a desiccator to prevent water damage to the surfaces, and coated (typically with germanium) to minimise water damage from short term atmospheric exposure during beamsplitter swapouts. Optical properties Transmission range: 250 nm to 55 µm Refractive index: 1.739 at 10.6 µm Reflection loss: 13.6% @ 10.6 µm (2 surfaces) Physical properties Hardness (Knoop): 137.9 kPa (20 lbf/in2) Young's modulus: 5.3 GPa (769 lbf/in2) Modulus of rupture: 5.6 GPa (810 lbf/in2) Apparent elastic limit: 5.6 GPa (810 lbf/in2) Structure: Cubic, no cleavage color: colorless References v · d · e  Caesium compounds CsBr · CsCl · CsClO4 · Cs2CrO4 · CsF · CsH · CsI · CsNO3 · CsOH · Cs2CO3 · Cs2SO4 · CsC2H3O2 · Cs2O · Cs2TiO2