It is shown that 2,2'-di-methylstyrylbenzene (bis-MSB) at a concentration of 10^-3 M in l-methyl-2-pyrrolidone can fluoresce at 420 nm upon excitation by a 708-nm femtosecond Ti: sapphire laser. The dependence of the fluorescence intensity on the excitation power proved to be cubic. The three-photon absorption cross section of bis-MSB was estimated as (1.61 ± 0.10) x 10^-79 cm^6 s^2 phot^-2. bis-MSB is recommended as a cubic standard to normalise laser powers in three-photon measurements.
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