Production of cold beams of ND3 with variable rotational state distributions by electrostatic extraction of He and Ne buffer-gas-cooled beams.
Production of cold beams of ND3 with variable rotational state distributions by electrostatic extraction of He and Ne buffer-gas-cooled beams.
复制标题
通过静电提取 He 和 Ne 缓冲气体冷却束来生产具有可变旋转状态分布的 ND3 冷束。
DOI：
10.1063/1.4885855
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
T. Softley
中科院分区：
文献类型：
--
作者：
K. S. Twyman;M. T. Bell;B. R. Heazlewood;T. Softley
本文描述了ND_3选速缓冲气体冷却束流转动态分布的测量。在最近建造的研究冷离子-分子碰撞的装置中，使用具有三个90°弯曲的2.15m长的静电四极杆引导从低温冷却的缓冲气体室中提取ND 3束。通过调节缓冲气室的温度，可以产生转动态布居数约为T（rot）= 9-18 K的ND 3光束（在6 K或17 K下操作）、缓冲气体（He或Ne）的特性、或缓冲气体和ND 3的相对密度。在6 K氦和17 K氖缓冲气体电池中，被引导的ND 3的平移温度被发现是相似的（峰值动能分别为6.92（0.13）K和5.90（0.01）K）。这种冷分子源的表征提供了一个机会，在低温碰撞反应截面的旋转依赖性的第一次实验调查。
The measurement of the rotational state distribution of a velocity-selected, buffer-gas-cooled beam of ND3 is described. In an apparatus recently constructed to study cold ion-molecule collisions, the ND3 beam is extracted from a cryogenically cooled buffer-gas cell using a 2.15 m long electrostatic quadrupole guide with three 90° bends. (2+1) resonance enhanced multiphoton ionization spectra of molecules exiting the guide show that beams of ND3 can be produced with rotational state populations corresponding to approximately T(rot) = 9-18 K, achieved through manipulation of the temperature of the buffer-gas cell (operated at 6 K or 17 K), the identity of the buffer gas (He or Ne), or the relative densities of the buffer gas and ND3. The translational temperature of the guided ND3 is found to be similar in a 6 K helium and 17 K neon buffer-gas cell (peak kinetic energies of 6.92(0.13) K and 5.90(0.01) K, respectively). The characterization of this cold-molecule source provides an opportunity for the first experimental investigations into the rotational dependence of reaction cross sections in low temperature collisions.
影响因子：
56.9
作者：
Chang, Yuan-Pin;Dlugolecki, Karol;Willitsch, Stefan
通讯作者：
Willitsch, Stefan