Laser action on the B2 SIGMA+1/2 --> X2 SIGMA+1/2 band of HgCl at 557.
6 nm (v' = 0 --> v'' = 22) has previously been achieved under a variet
y of electronic and optical excitation mechanisms. This letter describ
es a chemical mechanism for producing excited HgCl. We report on the g
as phase reaction between alkali atoms (K, Rb, and Cs) and HgCl2 which
produces HgCl (B-X) emission.