【摘要】 用532 0nm激光激发Na2分子到B1Πu电子态,记录了Na(3P)原子的跃迁和Na2分子的A1Σ+u-Χ1Σ+g的谱带。由Na与Na2激发态发射的光谱及其强度可以认定在Na-Na2系统中的碰撞过程,Na(3P)原子线是Na2(B1Πu)到Na(3P)的碰撞能量转移产生的,预解离过程也可产生原子线。而A1Σ+u的辐射而引起的。在360℃,u-Χ1Σ+g到A1Σ+g谱带是由B1Πu到21Σ+g的碰撞转移后再由21Σ+根据辐射衰变率和荧光强度,得到Na2(B1Πu)到Na2(21Σ+g)碰撞转移率系数为7 1×10-10cm3s-1,而B1Πu的预解离率为2 3×106s-1。更多还原

【Abstract】 The B（）¹Π_u electronic state of Na₂ is excited by the 532.0?nm laser line.The Na（3P） atomic transitions and the A（）¹Σ⁺_u→X（）¹Σ⁺_g band of Na₂ have been recorded.From the intensities and spectra of the Na and Na₂ fluorescence several collisional processes in the excited sodium atom-dimer system have been identified.The Na（3P） atomic lines are the result of collisional energy transfer from the Na₂ （B（）¹Π_u） to the Na（3P）.Predissociation process may also contribute to atomic fluorescence.The A（）¹Σ⁺_u→X（）¹Σ⁺_g band is interpreted through a populating mechanism involving collisional transfer from the B（）¹Π_u to the 2（）¹Σ⁺_g followed by radiative transfer to the A（）¹Σ⁺_u state. From the decay constants and fluorescence intensities,the rate coefficient at 360℃ for collisional energy transfer from Na₂（B（）¹Π_u） to Na₂（2（）¹Σ⁺_g） is 7.1×10^-10?cm³S^-1.The predissociation rate of the B（）¹Π_u is 2.3×10⁶?S^-1.更多还原