  We probe the evolution of the fine-structure constant, alpha, with cosmic
time. Accurate positions of the FeII lines 1608, 2382,and 2600 A are measured
in the z = 1.84 absorption system from a high-resolution (FWHM = 3.8 km/s) and
high signal-to-noise (S/N >= 100) spectrum of the quasar Q1101-264 (z_em =
2.15, V = 16.0), integrated for 15.4 hours. The Single Ion Differential alpha
Measurement (SIDAM) procedure and the Delta chi^2 method are used to set
constraints on Delta alpha/alpha. We have found a relative radial velocity
shift between the 1608 A and 2382,2600 A lines of Delta v = -180 +/- 85 m/s
(both random and systematic errors are included), which, if real, would
correspond to Delta alpha/alpha = (5.4 +/- 2.5) 10^{-6} (1sigma C.L.).
Considering the strong implications of a such variability, additional
observations with comparable accuracy at redshift z ~ 1.8 are required to
confirm this result.
