Citation: WANG Wen-Qing, NG Yan, SHEN Xin-Chun, ZHANG Yu-Feng. Experimental Test of“Parity-Time Asymmetry”in Electron Spin-Flip Raman Scattering of the N⁺H…O Hydrogen Bond in Chiral Alanine Crystals[J]. Acta Physico-Chimica Sinica, ;2013, 29(03): 473-478. doi: 10.3866/PKU.WHXB201212273 shu

Experimental Test of“Parity-Time Asymmetry”in Electron Spin-Flip Raman Scattering of the N⁺H…O Hydrogen Bond in Chiral Alanine Crystals

1.
1 Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China;
2 School of Materials Science & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, P. R. China

Received Date: 13 November 2012
Available Online: 27 December 2012
Fund Project: 国家自然科学基金(21002006, 20452002) (21002006, 20452002)国家科技部基础研究重大项目(2004-973-36)资助 (2004-973-36)

Spontaneous symmetry breaking of the N⁺H…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…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_α－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.
- 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
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Experimental Test of“Parity-Time Asymmetry”in Electron Spin-Flip Raman Scattering of the N+H…O Hydrogen Bond in Chiral Alanine Crystals

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通讯作者: 陈斌, bchen63@163.com

Experimental Test of“Parity-Time Asymmetry”in Electron Spin-Flip Raman Scattering of the N⁺H…O Hydrogen Bond in Chiral Alanine Crystals