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Spectral density calculation by using the Chebyshev expansion
Tsutomu Ikegami1, Suehiro Iwata
1Department of Chemistry, University of Puerto Rico, San Juan 00931-3346, USA. ikegami@adam.uprr.pr
Abstract:
A method to calculate the spectral density of any state vectors with respect to a set of eigenstates of a Hamiltonian is presented. A spectral density operator, whose expectation value on the state vector gives the spectral density, is evaluated indirectly by using the Chebyshev expansion method. A spectral transformation function is introduced to improve resolution at the low energy region, at the expense of the one at the higher region. The predissociation spectrum of CO+ is calculated to demonstrate the method.
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