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P2(cos ¦È) = 1/2 (3 cos2 ¦È − 1) A perfect alignment corresponds to an order parameter of 1, whereas a random orientation gives a value of 0. A typical liquid crystal has an order parameter in the range 0.3 to 0.8. The value generally decreases as the temperature is raised. In particular a sharp drop of the order parameter is observed when the system undergoes a phase transition. The order parameter can be measured experimentally in a number of ways, such as diamagnetism, birefringence, Raman scattering, NMR, and EPR. ÔõÑùÓÉDPDÄ£ÄâµÄ½á¹û¼ÆËãcos¦ÈÖµ£¬ÖÚ¶àÎÄÏ×¶¼Ã»ËµµÄºÜÇå³þÈçºÎ¼ÆË㣿£¿£¿£¿Çó´óÉñ½â´ð£¡£¡£¡ |
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