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It supports the recent ab initio calculation.
The newly calculated ab initio spectrum is in very good agreement with experiment throughout the above spectral range, both in band positions and intensities.
It is suggested that the present experimental results provide new target values for validation of future ab initio calculations.
While Ames and UCL ab initio intensities are believed to be accurate within a few % for the strong unperturbed bands, the reported measurements allow testing important (>50%) differences between ab initio values of some weak perturbed bands.
Our results add to the existing ab initio database for use in fitting and testing interatomic potentials.
The results compare well with previous ab initio all-electron calculations and with experimental data.
Moreover, the method has been shown to be efficient and to be easily implemented in each ab initio software package.

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