Characterizing quasibound states and scattering resonances

Characterizing quasibound states and scattering resonances
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表征准束缚态和散射共振

DOI:
10.1103/physrevresearch.2.013291
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发表时间:
2020
影响因子:
4.2
通讯作者:
Frye M
Frye M
中科院分区:
--
文献类型:
--
作者:
Frye M

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从耦合通道散射计算中表征准束缚态可能是一项艰巨的任务,涉及大量的手动迭代和拟合。我们提出了一个自动化的过程,基于相移或S-矩阵本征相位和,可靠地收敛于一个准束缚态(或散射共振)从一定的距离。它可以用于单通道和多通道散射。它产生了态的能量和宽度以及背景散射的相移,从而产生了态的寿命。它还允许提取个别明渠的部分衰减宽度。我们证明了一个非常窄的状态在货车的范德华复杂的Ar-,衰减只有通过振动预解离,和近阈值状态,其寿命变化超过四个数量级的磁场的函数的方法。
Characterizing quasibound states from coupled-channel scattering calculations can be a laborious task, involving extensive manual iteration and fitting. We present an automated procedure, based on the phase shift orS-matrix eigenphase sum, that reliably converges on a quasibound state (or scattering resonance) from some distance away. It may be used for both single-channel and multichannel scattering. It produces the energy and width of the state and the phase shift of the background scattering, and hence the lifetime of the state. It also allows extraction of partial widths for decay to individual open channels. We demonstrate the method on a very narrow state in the Van der Waals complex Ar–, which decays only by vibrational predissociation, and on near-threshold states of, whose lifetime varies over four orders of magnitude as a function of magnetic field.
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