中国激光, 2011, 38 (7): 0715001, 网络出版: 2011-05-31
在Na2(A1∑+u)与H2碰撞中的相干反斯托克斯拉曼谱研究
Coherent Anti-Stokes Raman Spectroscopy Study in the Na2(A1∑+u)-H2 Collision
激光光谱 能量转移 相干反斯托克斯拉曼谱 能量配置 速率系数 laser spectroscopy energy transfer coherent anti-Stokes Raman spectroscopy energy disposal rate coefficient Na2-H2 Na2-H2
摘要
利用相干反斯托克斯拉曼谱(CARS)分析了H2在与Na2(A1∑+u)碰撞后的振转态布居数分布。扫描CARS表明了在能量转移过程中H2在V=1,2,3振动能级上得到布居。由扫描CARS的峰值得到2个可能的布居数比值,通过解速率方程组及时间分辨CARS轮廓模拟,确定实际的布居数比n1/n2为1.82,得到了在能量转移中H2在V=1,2,3振动能级上的布居数之比为0.530.300.17。平均转移能量分配的相对值〈ft〉,〈fv〉,〈fr〉分别为0.51,0.46,0.03,能量主要配置在振动和平动上,支持Na2-H2的直线式碰撞传能机制。
Abstract
Coherent anti-Stokes Raman spectroscopy (CARS) has been used to analyze the internal state distribution of H2 after energy transfer with Na2(A1∑+u). The scanned CARS reveals that during energy transfer processes H2 molecules are produced at the V=1, 2 and 3 vibrational levels. Two possible populations ratios (n1/n2) are obtained from scanned CARS peaks. The actual population ratio n1/n2 is determined to be 1.82 through shape simulations of the time resolved CARS profiles under a kinetic model. The n1/n2 ratio indicates that the H2 molecules produced by the energy transfer process are 0.53 populated at the V=1 level, 0.30 at V=2 and 0.17 at V=3. The relative fraction (〈ft〉, 〈fv〉, 〈fr〉) of average energy disposal is derived as 0.51, 0.46, 0.03, which has a major energy releases in vibrational and translational. This consequence supports the collinear collision geometry in ratio Na2-H2 energy transfer.
蔡勤, 张利平, 栾楠楠, 程玉锋, 戴康, 沈异凡. 在Na2(A1∑+u)与H2碰撞中的相干反斯托克斯拉曼谱研究[J]. 中国激光, 2011, 38(7): 0715001. Cai Qin, Zhang Liping, Luan Nannan, Cheng Yufeng, Dai Kang, Shen Yifan. Coherent Anti-Stokes Raman Spectroscopy Study in the Na2(A1∑+u)-H2 Collision[J]. Chinese Journal of Lasers, 2011, 38(7): 0715001.