  The spectroscopic hyperfine constants for all the alkali atoms are reported.
For atoms from lithium to cesium, only the long lived atomic isotopes are
examined. For francium, the measured data for nuclear ground states of all
available isotopes are listed. All results obtained since the beginning of
laser investigations are presented, while for previous works the data of
Arimondo {\it et. al.} Rev. Mod. Phys. 49, 31 (1977) are recalled. Global
analyses based on the scaling laws and on the hyperfine anomalies are
performed.
