Langmuir–Taylor surface ionization of alkali (Li, Na, K) and alkaline earth (Ca, Sr, Ba) atoms attached to helium droplets
Langmuir–Taylor surface ionization of alkali (Li, Na, K) and alkaline earth (Ca, Sr, Ba) atoms attached to helium droplets
复制标题
附着在氦液滴上的碱金属（Li、Na、K）和碱土金属（Ca、Sr、Ba）原子的 Langmuir-Taylor 表面电离
DOI：
10.1063/1.1287750
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发表时间：
2000
影响因子：
1.6
通讯作者：
H. Lutz
中科院分区：
文献类型：
--
作者：
F. Stienkemeier;M. Wewer;F. Meier;H. Lutz
用Langmuir-Taylor表面电离法探测了一束掺碱金属和碱土金属原子的超流氦液滴（HeN，N_x104）。我们测量的检测效率和时间常数作为一个功能的一个热的表面的温度。自由K，Na和Ba原子的结果相比，我们发现几乎没有差异的检测性能;显然，氦主机环境并没有显着影响表面电离的机制。此外，数据锂，钙，锶的检测概率和停留时间的离子在热超导表面将首次提出。提取时间常数和解吸能量;对于碱土金属原子，发现后者显着高于碱金属的解吸。
A beam of superfluid helium droplets (HeN, N≈104) doped with alkali and alkaline earth atoms is detected by Langmuir–Taylor surface ionization. We measured detection efficiencies and time constants as a function of the temperature of a hot rhenium surface. Compared to results on free K, Na, and Ba atoms we find practically no differences in the detection properties; apparently the helium host environment does not significantly influence the mechanism of surface ionization. In addition, data for Li, Ca, and Sr on detection probabilities and residence times of the ions on the hot rhenium surface will be presented for the first time. Time constants and desorption energies are extracted; for alkaline earth atoms the latter are found to be significantly higher compared to the desorption of the alkalis.