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利用变温直流磁化率测定,在外加磁场强度为1T,磁场平行晶体c轴,发现在温度270K,D-和L-丙氨酸发生磁手性相变.结合中子衍射确定磁手性相变机制为,D-和L-丙氨酸中的(N+H)有类金属氢原子特性,在相变点270K,由(N+H)释放的电子自旋有磁手性.用变温偏振拉曼光谱进一步证明,D-丙氨酸中的(N+H)的电子自旋(“),而L-丙氨酸中的电子自旋(#),处于高低不同的能态.磁手性相变(宇称和时间反演都破缺)能差为10-4-10-5eV·molecule-1.
Using the variable temperature DC magnetic susceptibility measurement, we found that the magnetic phase transition of D- and L-alanine occurs at a magnetic field parallel to the magnetic field of 1T at a magnetic field of 1T at a temperature of 270K. The mechanism is that (N + H) in D-and L-alanine has a metalloid hydrogen atom characteristic and the electron spins released by (N + H) have a magnetic chirality at a phase transition point of 270 K. With variable temperature polarization Raman spectroscopy further demonstrated that the (N + H) electron spin (”) in D-alanine, while the electron spin in L-alanine, is in a different energy state at high and low levels Chiral phase transition (parity and time inversion are broken) can be 10-4-10-5eV · molecule-1.