理论上通过从头算法(abinitio)计算强相互作用的N2分子二聚物可能存在的6种点群构型的势能曲线,证明N2分子二聚物以D2h对称群构型存在,且存在电偶极允许的类准分子跃迁a1B2g→a1B3u,并计算了a1B2g→a1B3u跃迁的荧光谱.估算了N2分子二聚物(336.21nm)的小信号增益系数.利用微波(2.45GHz)激励高纯氮,实验观测了N2分子二聚物的系列荧光谱带,并利用放大自发辐射(ASE)法测量N2分子二聚物(336.21nm)的小信号增益系数,在误差范围内与理论估算基本一致.最后从理论上估算了N2分子二聚物激光振荡的输出功率.

Theoretical ab intio calculations for different symmetry groups of N 2 molecular dimer are performed. It is proved that the potential energy curves of N 2 molecular dimer with D 2h symmetry group have an excimer like a 1B 2g→a 1B 3u transition. The theoretical emission spectra for a 1B 2g→a 1B 3u transition is calculated. The experimentally observed spectra for N 2 molecular dimer is found to be in good agreement with theoretical calculations. The gain coefficient of N 2 molecular dimer at 336.21 nm is estimated. The gain coefficient is measured with amplified spontaneous emission method, experimental results correspond to the estimation in the range of error. In the end the output laser power is estimated.