C 4þ and S 4þ -codoped titanium dioxide (TiO 2 ) having a rutile phase was prepared. By doping C 4þ and S 4þ ions into a TiO 2 lattice, the absorption edge of rutile TiO 2 powder was largely shifted from 400 to 700 nm. 2-Methylpyridine and methyleneblue were photocatalytically oxidized at high efficiency on C 4þ and S 4þ -doped TiO 2 under visible light at a wavelength longer than 5 nm.KEY WORDS: TiO 2 photocatalyst; photocatalysis with visible light.

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Femtosecond time-resolved coherent anti-Stokes Raman scattering has been observed from the C = C stretching of alkynes (monoalkylacetylenes and dialkylacetylenes). The dephasing of the C=C stretching of C3H7C-H is found to be accelerated in mixtures with either proton-donors or proton-acceptors. The dephasing rates of the m C stretching of monoalkylacetylenes ( C n H Z n + l m H ) with relatively long alkyl chains (n 1 4) are nearly the same and are accelerated in mixtures with dimethylformamide regardless of the length of the alkyl chain. On the other hand, the dephasing in dialkylacetylenes is not accelerated in mixtures with dimethylformamide, reflecting the absence of hydrogen bonding between dialkylacetylenes and dimethylformamide.

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