Dissociative recombination of H2D+: Cross sections, branching fractions, and isotope effects.
Dissociative recombination of H2D+: Cross sections, branching fractions, and isotope effects.
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H2D 的解离重组：横截面、分支分数和同位素效应。
DOI：
10.1103/physreva.52.2901
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Ugglas
中科院分区：
文献类型：
--
作者：
Datz;Larsson;Stromholm;Sundström;Zengin;Danared;Källberg;Ugglas
我们已经在斯德哥尔摩的Manne Siegbahn实验室使用CRYRING重离子存储环来存储和冷却${\mathm{H}}_{2}$${\mathm{D}}^{+}$。这些电子束以每安培MeV的能量循环，并与以几乎相同速度行进的电子束合并。通过这种方式，获得了从几分之一微伏到数十微伏的相对能量。当发生解离重组(DR)时，中性碎片离开环并撞击探测器，从而能够测量DR总截面。利用这项技术，再加上“半透明势垒”，一些粒子直接穿过空穴，另一些粒子穿过薄固体，在撞击探测器之前损失部分能量，我们能够测量DR的总截面以及进入三体(H+H+H)通道和二体(H+H)通道的分支。将此方法与能量吸收器相结合，我们能够测量到这些量，其中包括Hd+H和Hd+D两个独立的二体通道以及有利于HD形成的同位素效应。
We have used the CRYRING heavy-ion storage ring at the Manne Siegbahn Laboratory in Stockholm to store and cool beams of ${\mathrm{H}}_{2}$${\mathrm{D}}^{+}$. These beams circulate with energies of MeV per amu and are merged with an electron beam traveling at nearly the same velocity. In this way, relative energies from a fraction of a meV to tens of an eV are achieved. When dissociative recombination (DR) takes place, the neutral fragments exit the ring and strike a detector, enabling the measurement of total DR cross sections. Using this technique, coupled with a ``translucent barrier'' in which some particles pass directly through holes and others pass through a thin solid and lose part of their energy before striking the detector, we are able to measure the total cross section for DR in ${\mathrm{H}}_{3}^{+}$ and the branching into the three-body (H+H+H) channel and the two-body (${\mathrm{H}}_{2}$+H) channel. Coupling this method with the use of energy absorbers, we are able to measure these quantities for ${\mathrm{H}}_{2}$${\mathrm{D}}^{+}$ and the separate two-body channels HD+H and ${\mathrm{H}}_{2}$+D. An isotope effect is observed favoring the formation of HD.