首页> 外文期刊>The Journal of Chemical Physics >Computing resonance energies, widths, and wave functions using a Lanczos method in real arithmetic - art. no. 244107
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Computing resonance energies, widths, and wave functions using a Lanczos method in real arithmetic - art. no. 244107

机译:在实际算术中使用Lanczos方法计算共振能量,宽度和波函数-艺术。没有。 244107

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摘要

We introduce new ideas for calculating resonance energies and widths. It is shown that a non-Hermitian-Lanczos approach can be used to compute eigenvalues of H+W, where H is the Hamiltonian and W is a complex absorbing potential (CAP), without evaluating complex matrix-vector products. This is done by exploiting the link between a CAP-modified Hamiltonian matrix and a real but nonsymmetric matrix U suggested by Mandelshtam and Neumaier [J. Theor. Comput. Chem. 1, 1 (2002)] and using a coupled-two-term Lanczos procedure. We use approximate resonance eigenvectors obtained from the non-Hermitian-Lanczos algorithm and a very good CAP to obtain very accurate energies and widths without solving eigenvalue problems for many values of the CAP strength parameter and searching for cusps. The method is applied to the resonances of HCO. We compare properties of the method with those of established approaches. (c) 2005 American Institute of Physics.
机译:我们介绍了计算共振能量和宽度的新思路。结果表明,可以使用非Hermitian-Lanczos方法来计算H + W的特征值,其中H为哈密顿量,W为复吸收势(CAP),而无需评估复杂的矩阵向量乘积。这是通过利用CAP修改的哈密顿矩阵与Mandelshtam和Neumaier提出的真实但非对称矩阵U之间的联系来完成的[J.理论。计算化学1,1,(2002)],并使用耦合二项Lanczos程序。我们使用从非Hermitian-Lanczos算法获得的近似共振特征向量和非常好的CAP来获得非常准确的能量和宽度,而无需为CAP强度参数的许多值求解特征值问题并寻找尖点。该方法适用于HCO的共振。我们将方法的属性与已建立的方法进行比较。 (c)2005年美国物理研究所。

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