State‐to‐state vibrational excitation of I2 in collisions with He
State‐to‐state vibrational excitation of I2 in collisions with He
复制标题
I2 与 He 碰撞时的状态振动激发
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
W. Gentry
中科院分区：
文献类型：
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作者：
G. Hall;Kopin Liu;M. McAuliffe;C. F. Giese;W. Gentry
采用一种新的实验技术测量了I2+He碰撞中v=0→1,2,3激发在阈值到0.4 eV的动能范围内的截面，该实验技术将脉冲分子束以可变交会角交叉，并用激光诱导荧光对散射产物进行状态选择性检测。测量截面的值范围从0.4 eV时v=1的约0.2 A2到低能检测极限时v=3的约10−5 A2。激励v=1、2和3时，截面的动能依赖分别近似为线性、二次和三次。实验截面与简单的经典模型和Schwenke和Truhlar在随文中报告的详细量子计算所预测的截面进行了比较。该系统的振动激发似乎主要来自与近似共线几何中相互作用势的陡排斥部分的近脉冲碰撞。
Cross sections for v=0→1, 2, 3 excitation in I2+He collisions have been measured over the kinetic energy range from threshold to 0.4 eV by means of a new experimental technique in which pulsed molecular beams are crossed at a variable intersection angle and scattered products are state selectively detected by laser induced fluorescence. The values of the measured cross sections range from about 0.2 A2 for v=1 at 0.4 eV to about 10−5 A2 for v=3 at the low‐energy detection limit. The kinetic energy dependences of the cross sections for exciting v=1, 2, and 3 are approximately linear, quadratic, and cubic, respectively. The experimental cross sections are compared with those predicted by a simple classical model and by the detailed quantum calculations reported by Schwenke and Truhlar in the accompanying article. It appears that vibrational excitation in this system comes primarily from nearly impulsive collisions with the steeply repulsive part of the interaction potential in approximately collinear geometr...