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Ordering Process in Sodium Nitrite Observed by Using Neutron Diffractometry
Hiroyuki Mashiyama,Tatsuki Miyoshi,Takanao Asahi,Hironobu Kasano,Yukio Noda,Hiroyuki Kimura 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
From neutron diffraction data, the nuclear density of sodium nitrite is guessed directly by a maximum entropy method, and is compared with the results of usual least-squares calculations. The obtained nuclear density displays that the disordered NO_2 molecule becomes partially ordered in the ferroelectric phase just below the transition temperature. However, the density distribution cannot be explained by a two-Gaussian function, which suggests that the ordering is not a classical stochastic process but a quantum tunneling in a double minima local potential.