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const double boltzmann = 1.3806505e-23;//µ¥Î»J/K
const double epsilon = 120.0*boltzmann;//¦Åµ¥Î»J, LJ·½³ÌÖеij£Êý
const double sigma = 3.4e-10;//¦Òµ¥Î»m, LJ·½³ÌÖеij£Êý
const double atom_mass = 39.95*1.6747e-27;//µ¥Î»Ç§¿Ë£¬39.95ÊÇë²µÄÔ­×ÓÁ¿

ѹǿp = p'*¦Å/(¦Ò^d)£¬pΪ¹ú¼Êµ¥Î»ÖÆÑ¹Ç¿£¬p'Ϊ¸ÃÊéÖеĵ¥Î»ÖÆ
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