缓冲气体热化负离子从多极射频离子阱中的蒸发
Evaporation of buffer gas-thermalized anions out of a multipole rf ion trap
摘要：
我们确定平原蒸发的离子作为基本的损失机制的多极离子阱。使用热化负Cl-离子，我们发现，蒸发损失率是成正比的玻尔兹曼因子。这种热力学描述揭示了新的光粒子的动态随时间变化的限制潜力。它特别允许我们提取离子阱的有效深度作为蒸发的激活能。作为一个函数的射频振幅，我们发现两个不同的制度有关的运动的稳定性被困离子。对于低振幅，整个陷阱允许稳定的运动，陷阱深度随射频场增加。然而，对于较大的射频振幅，快速的能量转移，从外地的离子运动可以发生在大的陷阱半径，这导致有效的捕获体积的减少。在这种情况下，陷阱深度再次随着射频振幅的增加而减小。我们给出了一个分析参数化的陷阱深度为各种多极陷阱，允许预测的最有利的捕获条件。
英文摘要：
We identify plain evaporation of ions as the fundamental loss mechanism out of a multipole ion trap. Using thermalized negative Cl- ions we find that the evaporative loss rate is proportional to a Boltzmann factor. This thermodynamic description sheds new light on the dynamics of particles in time-varying confining potentials. It specifically allows us to extract the effective depth of the ion trap as the activation energy for evaporation. As a function of the rf amplitude we find two distinct regimes related to the stability of motion of the trapped ions. For low amplitudes the entire trap allows for stable motion and the trap depth increases with the rf field. For larger rf amplitudes, however, rapid energy transfer from the field to the ion motion can occur at large trap radii, which leads to a reduction of the effective trapping volume. In this regime the trap depth decreases again with increasing rf amplitude. We give an analytical parameterization of the trap depth for various multipole traps that allows predictions of the most favorable trapping conditions.
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