Abstract
It is well established that a Chebyshev correlation function of the length 2 K can be calculated from a K-step Chebyshev propagation. Here, we propose an ansatz that such a doubling scheme can also be utilized to calculate positions and widths of narrow resonances using the low-storage filter diagonalization (LSFD) based on the damped Chebyshev propagation. This ansatz, which is shown to be numerically valid in two real molecular systems (HCO(X̃) and SO 2(C̃)), reduces the computational cost by half.
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