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	手性氨基酸分子的温度诱导相变——自发对称性破缺与复原(英文); Temperature-induced phase transitions in chiral amino acids - Search of spontaneous parity-breaking and restoration
	王文清 ; 闵玮 ; 龚
	2005
关键词	温度效应 温度鄄构象鄄宇称破缺能差关系 宇称破缺熵差 隧道动力学 丙氨酸对映体 temperature effect temperature-conforination-PVED relation parity-violating entropy difference tunneling dynamics alanine enantiomers
英文摘要	运用统计理论热力学函数自由能ΔG、焓ΔH、熵ΔS、平衡常数K与粒子平动、振动、转动配分函数关系,并通过变温D-与L-CDBrClF实例计算,证明在宏观温度变量下,可以导致手性分子D圳L平衡中宇称破缺熵差的反号.根据作者科研组14年来,采用变温X衍射、中子衍射、比热、直流和交流磁化率、1H和13C固相核磁共振、拉曼光谱、晶体旋光和双折射、超声测定相变等实验方法,证明Salam假说预言的温度范围(200～250K)存在温度变量诱导的相变,产生自发对称性破缺.在宇称破缺能差(PVED)接近0条件下,宇称破缺熵差导致D和L分子反向的物理行为,产生分叉机制(bifurcationmechanism).D...; The effects of temperature on the parity-violating entropy and energy differences of chiral molecules are investigated both theoretically and experimentally. Statistical thermodynamics calculations indicate the possible occurrence of sign reversal of parity-violating entropy difference at different temperatures, which is supported by temperature-dependent polarized Raman spectra of D-alanine and L-alanine. An incoherent spontaneous symmetry breaking is proposed to describe the bifurcation mechanism between mirror-image systems at the critical temperature, in which usually violated parity symmetry will be dynamically restored again. An asymmetric double-well potential with a tiny parity-violating energy difference(PVED) in the depths of the two potential wells showed that the presence of PVED can lead to the enrichment of L-form amino acid. Tunneling dynamics of amino acids with PVED provides a plausible mechanism for much faster development of homochirality.; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 1; 10; 1186-1194; 21
语种	中文
出处	知网 ; SCI
出版者	物理化学学报
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/80127]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	王文清,闵玮,龚. 手性氨基酸分子的温度诱导相变——自发对称性破缺与复原(英文), Temperature-induced phase transitions in chiral amino acids - Search of spontaneous parity-breaking and restoration. 2005-01-01.

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