Total Collision Cross Sections for the Interaction of Atomic Beams of Alkali Metals with Gases
Total Collision Cross Sections for the Interaction of Atomic Beams of Alkali Metals with Gases
复制标题
碱金属原子束与气体相互作用的总碰撞截面
DOI：
10.1063/1.1730662
复制
发表时间：
1959
期刊：
影响因子：
--
通讯作者：
R. Bernstein
中科院分区：
文献类型：
--
作者：
E. Rothe;R. Bernstein
用30″角分辨率的装置测量了K和Cs原子束与多种分子相互作用的总碰撞截面（Q）。虽然Q的绝对测定是困难的，但相对值很容易获得（±3%）。结果报告为给定分子的横截面与相同束原子的氩的横截面的比率（Q*）。77个分子（不同的复杂性和反应性）用K和16个用Cs束进行了研究。Q* 的范围为0.29 ~ 2.8。数据采用Massey-Mohr理论进行关联，假设分子间吸引势V（r）= -C/r6。对于这种情况，Q=B（C/vr）2/5，其中vr是相对速度，B是已知常数。使用已知的折射和偶极矩数据，根据伦敦色散和偶极诱导偶极力的标准公式估计C。Q的理论值与实验结果相差一个几乎恒定的因子，因此Q* 的值预测具有良好的精度。德……
Total collision cross sections (Q) for the interaction of atomic beams of K and Cs with a number of molecules were measured with an apparatus of 30″ angular resolution. Although absolute determinations of Q are difficult, relative values are readily obtained (±3%). Results are reported as the ratio (Q*) of the cross section for a given molecule to that of argon for the same beam atom. Seventy‐seven molecules (of varied complexity and reactivity) were studied with K and 16 with Cs beams. Q* ranged from 0.29 to 2.8.The data were correlated using the Massey‐Mohr theory, assuming an attractive intermolecular potential V(r) = —C/r6. For this case Q=b(C/vr)2/5, where vr is the relative velocity and b a known constant. C was estimated from standard formulas for the London dispersion and dipole‐induced dipole forces, using known refraction and dipole moment data. The theoretical values of Q differ by a nearly constant factor from the experimental results; thus values of Q* are predicted with good accuracy. The de...