Temperature dependence of the collisional energy transfer of OH(v=10) between 220 and 310 K
Temperature dependence of the collisional energy transfer of OH(v=10) between 220 and 310 K
复制标题
220 至 310 K 之间 OH(v=10) 碰撞能量转移的温度依赖性
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
R. Copeland
中科院分区：
文献类型：
--
作者：
J. Lacoursière;M. J. Dyer;R. Copeland
使用双激光泵-探针技术和专门设计的真空隔离流通池在 220 至 310 K 之间测量 O2、N2O 和 CO2 的热平均碰撞去除截面 (X 2∏, v=10) 的温度依赖性。氢原子与臭氧反应生成 v=6-9 的 OH 分子。 (10,7) 振动跃迁由脉冲近红外激光激发，产生 OH (v=10) 分子群。 v=10 群体的时间演化通过延时紫外激光脉冲作为对撞机气体压力的函数进行监测。探针步骤通过激发 B 2Σ+–X 2∏ (0,10) 跃迁并检测 B 2Σ+–A 2Σ+ (0,6–8) 跃迁的荧光来使用激光诱导荧光。从 310 到 223 K，对撞机 O2、N2O 和 CO2 的 OH (v=10) 去除截面分别增加了 35±21、33±14 和 58±48%。这种逆温度依赖性是典型的由长程吸引力 f 控制的损耗机制...
The temperature dependence of the thermally averaged collisional removal cross section of OH (X 2∏, v=10) by O2, N2O, and CO2 is measured between 220 and 310 K using a two-laser pump–probe technique and a specially designed vacuum-isolated flow cell. OH molecules are generated in v=6–9 by the reaction of hydrogen atoms and ozone. The (10,7) vibrational transition is excited with pulsed near-infrared laser light to create a population of OH (v=10) molecules. The temporal evolution of the v=10 population is monitored as a function of collider gas pressure by a time-delayed ultraviolet laser pulse. The probe step uses laser-induced fluorescence by exciting the B 2∑+–X 2∏ (0,10) transition and detecting the fluorescence from the B 2∑+–A 2∑+ (0,6–8) transitions. From 310 to 223 K, the OH (v=10) removal cross section increases by 35±21, 33±14, and 58±48 percent for the colliders O2, N2O, and CO2, respectively. This inverse temperature dependence is typical of a loss mechanism governed by long-range attractive f...