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We have measured the reduced absorption coefficients occurring in the wingsof the potassium 4S-5P doublet lines at 404.414 nm and at 404.720 nm broadenedby helium gas at pressures of several hundred Torr. At the experimentaltemperature of 900 K, we have detected a shoulder-like broadening feature onthe blue wing of the doublet which is relatively flat between 401.8 nm and402.8 nm and which drops off rapidly for shorter wavelengths, corresponding toabsorption from the X doublet Sigma+ state to the C doublet Sigma+ state of theK-He quasimolecule. The accurate measurements of the line profiles in thepresent work will sharply constrain future calculations of potential energysurfaces and transition dipole moments correlating to the asymptotes He-K(5p),He-K(5s), and He-K(3d).

Absorption spectrum in the wings of the potassium second resonance doublet broadened by helium