Research On The Precessions Of Molecular Electric Dipolemoments

Inertial navigation systems are autonomous navigation systems measuring theangular motion and the linear motion of the vehicle in the inertial space with the use ofinertial instruments. According to the differential equations, the position, velocity andattitude angle of the motion carriers could be timely and accurately calculated by theinertial navigation systems, where gyroscopes play a very important role.As the primary tool for measuring the angular rate of rotation, the main features ofgyroscopes are of fixed axis and precession. Both the general conventional gyroscopes andthe new-style atomic spin gyroscopes which take advantages of spin precession in thestatic magnetic field have these features. In this paper, based on the principles of theprecession gyroscopes, we propose a preliminary scheme for measuring the frequency ofrotation using the precessions of molecular dipole moments in the electrostatic field.We introduce the principles of varieties of precession gyroscopes at first, and thenbased on these principles, we propose a preliminary scheme for measuring the frequencyof rotation using the precessions of molecular dipole moments in the electrostatic field.Based on the analysis for different types of molecules, we choose the CH3F molecules asthe experimental molecules. The classical and quantum images about the precession ofCH3F in the electrostatic field are described in detail, and the physical processes andvariables involved in the scheme are elucidated as well. By analysing the sensing electricfield amplitude of the molecule at room temperature, the state of|J=6，|K|=6﹥isselected as the molecular resonance state in experiments, and the interferences from othermolecule states are suppressed by improving the strength of the electrostatic field. Underthe condition of the strength of the electrostatic field of5.0×104V/m, the temperature of300K and the molecular density of2.7×1014cm-3, the precession frequency of CH3F is420MHz, the amplitude of the induced voltage is10-6V and the detection sensitivity ofthe rotational frequency could be at the level of100Hz. On the other hand, if we use thismethod to measure the strength of electric field, the accuracy can reach0.07V/m.