A veiocity selected atomic potassium beam produced by sputteriag has been utilized to shidy collisional excitation of K atoms by dfatomic mofecutes. K*(42P) sas d&e&cd by its xmE&ive decg. For Nz, SO and 02 the excitation thresholds coincide with the endoergicity of the 4% -t 43P transition, 1.6 eV (c3n.s.) whereas for CO the threshold occurs at 2.1 eV. The cross sections rise about Linearly witb velocity above threshold aud are of the order of 2.&2 at 4 eV.
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