Knowledge Bank

The features of IR spectroscopy of $N2O$ in the atmosphere are very important to detect atmospheric temperature, since the detection is based on the inversion evaluation from satellite data of radiance measurement with $N2O$ transmission in the atmosphere. The measurement and theoritical calculation of absorption spectra of ro-vibrational lines of 10 u bands of $N2O$ laser by atmospheric $N2O$ component in Shanghai Region have been obtained as a function of zenith angle, propagating path and wave length. Results showed that the attenuation became larger with decreasing zenith angle but the effect of propagating path on attenuation was not so high after the laser beam propagated a certain distance. For example, the decibel was of $0.259\ast 10-5$ at 5 km under $20\circ$ zenith angle for P(18) transition but $0.248\ast 10-5$ at the same distance under $50\circ$ zenith angle, and became almost a constant beyond propagating after 20 kilometers.