François Shindo et al 2007 J. Phys. B: At. Mol. Opt. Phys. 40 2841 doi:10.1088/0953-4075/40/14/005
François Shindo, James F Babb, Kate Kirby and Kouichi Yoshino
Show affiliationsWe have measured the reduced absorption coefficients occurring in the wings of the potassium 42S–52P doublet lines at 404.414 nm and at 404.720 nm broadened by helium gas at pressures of several hundred Torr. At the experimental temperature of 900 K, we have detected a shoulder-like broadening feature on the blue wing of the doublet which is relatively flat between 401.8 nm and 402.8 nm and which drops off rapidly for shorter wavelengths, corresponding to absorption from the X2Σ+ state to the C2Σ+ state of the K–He quasimolecule. The accurate measurements of the line profiles in the present work will sharply constrain future calculations of potential energy surfaces and transition dipole moments correlating to the asymptotes He–K(5p), He–K(5s), and He–K(3d).
32.70.Jz Line shapes, widths, and shifts
31.50.-x Potential energy surfaces
32.70.Fw Absolute and relative intensities
32.70.Cs Oscillator strengths, lifetimes, transition moments
Issue 14 (28 July 2007)
Received 9 May 2007
Published 4 July 2007
François Shindo et al 2007 J. Phys. B: At. Mol. Opt. Phys. 40 2841
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