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The potential energy curves for the X1∑ g, B1△g and B′1∑ g states of C2 have been studied by using MRCI and approximate CI methods, and are benchmarked against the calculations of full configuration interaction (FCI). The results obtained by MRCI method agree with the FCI very well, and even are accurate enough to compare other approximate methods as benchmark, when the calculations of FCI are not feasible. The approximate CI methods mentioned in this paper are reliable for treating chemical problems. 相似文献
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We take the vertical distribution of the radial and azimuthal velocities into account in spherical coordinates, and find that the analytic relation c s0/ν K Θ=[(γ−1)/2γ]1/2 is valid for both geometrically thin and thick accretion flows, where c s0 is the sound speed on the equatorial plane, ν K is the Keplerian velocity, Θ is the half-opening angle of the flow, and γ is the adiabatic index.
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