Perturber Dependence of Disalignment Cross Sections of the Argon 2p2 Atoms Measured at Temperatures between 77 and 295 K
Perturber Dependence of Disalignment Cross Sections of the Argon 2p2 Atoms Measured at Temperatures between 77 and 295 K
复制标题
在 77 至 295 K 温度下测量的氩 2p2 原子错位截面的扰动依赖性
DOI：
10.1143/jpsj.81.114302
复制
发表时间：
2012
影响因子：
1.7
通讯作者：
Masahiro Hasuo
中科院分区：
文献类型：
--
作者：
Hiraku Matsukuma;Hirotaka Tanaka;Yukihiro Takaie;Taiichi Shikama;Cristian Bahrim;Masahiro Hasuo
在纯氩或氩和氦或氖的混合物在77、135、190、240和295 K的温度受控的辉光气体放电中，线性偏振激光脉冲从1s3能级产生2p2（在Paschen记法中）能级上的偏振氩原子。我们测量了从2p2能级到1s2能级的直接荧光，并对其偏振分量进行了分辨。从这些组件的强度的时间演变，我们确定的失调率。通过分离辐射重吸收的影响，确定了氦、氖、氩原子碰撞产生的非对准速率系数，并由速率系数除以碰撞原子的平均相对速度，确定了非对准的有效截面。发现原子序数越大的微扰稀有气体原子具有越大的退极化截面。这种效应可以归因于较大原子序数的微扰子的偶极极化率较大。
In a temperature controlled glow gaseous discharge of pure argon, or a mixture of argon and helium or neon at 77, 135, 190, 240, and 295 K, a linearly polarized laser pulse produces polarized argon atoms on the 2p2(in Paschen notation) level from the 1s3level. We measure the direct fluorescence from the 2p2level to the 1s2level with its polarization components resolved. From the temporal evolution of the intensities for these components, we determine the disalignment rate. We also determine the disalignment rate coefficients due to helium, neon and argon atom collisions by separating the effect of radiation reabsorption, and then determine the effective cross section of disalignment from the rate coefficient divided by the mean relative velocity of colliding atoms. It is found that perturber rare gas atoms with larger atomic number have larger depolarization cross section. This effect can be attributed to larger values of the dipole polarizability for perturbers with larger atomic number.