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http://pubs.acs.org/doi/abs/10.1021/jp2057404

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pi_g µÄ¼£Îª £­2cosA
pi_uµÄ¼£Îª 2cosA
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(sigma_u^+) * (sigma_u^-) * (delta_u) = - 1 - 1 -2cos(2A) = pi_g * pi_u

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