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The 0 and 1 order indexes ~0B and ~1B of ~mB were derived to correlate the long wavelength limit(¦Ë)and the lattice energy (U)of 23 different types of transparent ionic crystals in infrared range.
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In electricity and magnetism, the long wavelength limit is the limiting case when the wavelength is much larger than the system size. This corresponds to the quasi-static case, and reduces to electrostatics and magnetostatics.
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