Study on IR Spectral Parameters of NO by Ab Initio Method

Abstract

Molecular spectral parameters are fundamental data for IR radiation calculation. Currently, there is no such gas spectral database as the high resolution transmission molecular absorption database (HITRAN database) in China. In this paper, supported by the National Numerical Windtunnel (NNW) project, we developed the calculation codes of high-temperature air spectral parameters to support the calculation of target IR radiation. To be specific, NO is one of the products of chemical reactions in the high-temperature air flow field of hypersonic vehicles, and the radiation generated by its vibration-rotation levels is in the typical band of infrared detectors. Based on the molecular potential and permanent dipole moment of split NO calculated by the ab initio