lie close
7.The natural fractional isotope abundance ratio of boron was determined according to the intensity of v_3 bond of ~(11)BCl_3 and ~(10)BCl_3 by infrared spectroscopy in the fluorocarbon oil system with self-made BCl_3.The results(4.01 and 4.00±0.05)obtained by two methods, rectifying the disturbance of impurities and overlapping bands or selecting an improved base line under the controlled impurity quantity,lie close to the data by mass spectrometry.

