  Motivated by previous studies of QSO spectra that reported a variation of the
fine structure constant alpha, a search for C IV and Si IV doublets was
conducted in the absorption spectrum toward QSO 1101-264, obtained by VLT-UVES
during the Science Verification. Seven C IV and two Si IV systems were
identified and accurate measurements of wavelengths over the redshift range
1.1862 < z < 1.8377 were performed. After a careful selection of pairs of
lines, the "Alkali Doublet" method with a derived analitical expression for the
error analysis was applied to compute the alpha variation. The result according
in magnitud order with previous doublets measurements, corresponds to one Si IV
system: Delta alpha/alpha = (- 3.09 +/- 8.46) x 10^(-5).
