Discussion
Why is diamond used for some attenuated total reflectance crystals?
Answer: C
Diamond withstands hard samples clamped at high pressure and is chemically inert, which zinc selenide and germanium are not. Its index is lower than germanium's, it has a weak absorption of its own near 2000, and it is far more expensive. A material chosen for durability rather than optical performance is the right trade when the alternative is replacing a soft crystal regularly.
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