Infrared Spectra and Vapor Pressure Isotope Effect of Crystallized Ammonia and Its Deuterium Derivatives
Infrared Spectra and Vapor Pressure Isotope Effect of Crystallized Ammonia and Its Deuterium Derivatives
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结晶氨及其氘衍生物的红外光谱和蒸气压同位素效应
DOI：
10.1063/1.1676229
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发表时间：
1971
影响因子：
4.4
通讯作者：
E. Wolff
中科院分区：
文献类型：
--
作者：
H. Wolff;H.‐G. Rollar;E. Wolff
我们重新研究了由Reding和Hornig在1951年和1955年彻底研究过的结晶NH_3、NH_2D、ND_2H和NH_3的红外光谱。NH_3和ND_3的反对称伸缩带被分裂。它们的位移相对于气相的值，以前的测量发现是近似相等的，现在已经显示出明显不同。NH_2D和ND_2H的反对称伸缩振动与NH_3和ND_3的反对称伸缩振动是分开的。NH2D的ND伸缩振动由未受扰的振动中心带和由于相关场分裂而产生的两个卫星带组成的三重态组成。从这种分裂可以得出氨分子间的分子间耦合很弱。NH_2D和ND_2H以及NH_3和ND_3中NH和ND伸缩力常数相等的原因是：（1）ND_2H的NH伸缩振动位于NH_2D的NH_2伸缩振动的中间，ND伸缩振动位于ND_2伸缩振动的中间。
We have reinvestigated the infrared spectra of crystalline NH3, NH2D, ND2H, and NH3, which were throughly studied by Reding and Hornig in 1951 and 1955. The antisymmetric stretching bands of NH3 and ND3 are found to be split. Their shifts relative to the values for the gas phase found to be approximately equal by the previous measurements have now been shown to be distinctly different. The antisymmetric stretching vibrations of NH2D and ND2H are observed separately from those of NH3 and ND3. The ND stretching vibration of NH2D consists of a triplet composed of the unperturbed vibrational center band and of two satellite bands due to correlation field splitting. It has been derived from this splitting that intermolecular coupling between the ammonia molecules is weak. The equality of the NH and ND stretching force constants in NH2D and ND2H as well as in NH3 and ND3 follows from two facts: (1) The NH stretching vibration of ND2H lies in the middle of the NH2 stretching vibrations of NH2D, also the ND stret...