“宇称-时间不对称”的实验探索:手性丙氨酸单晶NH…O氢键的电子自旋翻转相变的不对称拉曼散射

doi:10.3866/PKU.WHXB201212273

CORC > 北京大学 > 化学与分子工程学院

	“宇称-时间不对称”的实验探索:手性丙氨酸单晶NH…O氢键的电子自旋翻转相变的不对称拉曼散射; Experimental Test of“Parity-Time Asymmetry”in Electron Spin-Flip Raman Scattering of the N+H…O Hydrogen Bond in Chiral Alanine Crystals
	王文清* ; 龚 ; 沈新春 ; 张玉凤
刊名	物理化学学报
	2013
关键词	宇称-时间不对称自发对称性破缺不对称拉曼散射极性N+H…O氢键次甲基电子自旋翻转相变真实手性 D-和L-丙氨酸单晶 Parity-time asymmetry Spontaneous symmetry breaking Asymmetric Raman scattering Polar N+H…O bond Methyne Electron spin-flip transition True chirality D-and L-alanine crystals Parity-time asymmetry Spontaneous symmetry breaking Asymmetric Raman scattering Polar N+H center dot center dot center dot O bond Methyne Electron spin-flip transition True chirality D- and L-alanine crystals
DOI	10.3866/PKU.WHXB201212273
英文摘要	手性丙氨酸单晶的极性N+H…O氢键在~270 K的自发对称性破缺,可用变温拉曼振动光谱在b(cc)b几何条件下在线测定.由于其对手性的灵敏度,可以测定D-和L-丙氨酸的N+H…O氢键在电子自旋翻转相变时的微小能差.晶体定向能量的正/负,在于电子自旋的上/下转向,取决于原子内在磁场的方向.变温拉曼振动光谱可以观察到:在D-和L-丙氨酸单晶之间,拉曼散射光子的波数位移方向相反,散射光子的不对称度约为1/3.由于自旋是轴矢量,样品必须是单晶,沿轴向测定.多晶粉末不能观察到相变.与次甲基(Cα-H)在260 K的自旋翻转相变,用变温拉曼振动光谱在c(aa)c几何条件下的相对测量结果接近一致.本实验提供了一条证明真实手性和“宇称-时间(PT)不对称”的新线索.; Spontaneous symmetry breaking of the N+H center dot center dot center dot O bond in chiral alanine crystals around 270 K was detected in situ by Raman vibrational scattering with b(cc)b geometry. An electron spin-flip transition of the N+H center dot center dot center dot O mode in D-/L-alanine was observed by the scattering of light with left/right orientation and its spin projection antiparallel to the direction of propagation. It is an internal magnetic field originated from the spin-orbit interaction. An obvious Raman wavenumber shift with opposite in sign and roughly one third of the asymmetry (A) of the scattered photon between D- and L-alanine crystals was observed. This shift was not seen in polycrystalline powder measurements because spin is an axial vector. An electron spin-flip transition of the methyne (C-alpha-H) mode around 260 K was shown to be approximative coincidence by examining the temperature-dependent relative intensity of asymmetric Raman scattering with c(aa)c geometry. This article provides evidence for the true chirality and parity-time (PT) asymmetry in molecular clusters of D- and L-alanine crystals.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000315584400004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; 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); 2; 3; 473-478; 29
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/226659]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	王文清*,龚,沈新春,等. “宇称-时间不对称”的实验探索:手性丙氨酸单晶NH…O氢键的电子自旋翻转相变的不对称拉曼散射, Experimental Test of“Parity-Time Asymmetry”in Electron Spin-Flip Raman Scattering of the N+H…O Hydrogen Bond in Chiral Alanine Crystals[J]. 物理化学学报,2013.
APA	王文清*,龚,沈新春,&张玉凤.(2013).“宇称-时间不对称”的实验探索:手性丙氨酸单晶NH…O氢键的电子自旋翻转相变的不对称拉曼散射.物理化学学报.
MLA	王文清*,et al."“宇称-时间不对称”的实验探索:手性丙氨酸单晶NH…O氢键的电子自旋翻转相变的不对称拉曼散射".物理化学学报 (2013).