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With an aim of examining the validity of non-LTE line-formation calculationsfor the strong C I lines of multiplet 1 at 1.068-1.069 mu~m, especially interms of the treatment of collisions with neutral hydrogen (H I) atoms, wecomputed theoretical equivalent widths (W_lambda) of these lines correspondingto specific intensities of different angles (mu = cos(theta)) on the solar diskunder various conditions, which were then compared with the empirical W_lambdavs. mu relations obtained from our spectroscopic observations using theDomeless Solar Telescope at Hida Observatory. It turned out that ourobservational data are almost consistent with the theoretical simulations donewith the H I collision rates computed with the classical formula, whichsuggests that the necessity of its significant revision (e.g., considerablereduction) is unlikely.

Empirical Investigation on the Impact of Hydrogen Collisions for the Formation of CI 1.07 mu~m Lines Based on the Solar Center-to-Limb Variation