Abstract
Using high-resolution, Doppler-free spectroscopy, we recorded through resonance-enhanced multiphoton ionization the response of two-photon rotational lines of the Q-branch of CO to an independent photoionizing optical field. In direct proportion to the photoionization intensity, transitions were lifetime broadened and shifted toward positive frequency, from which we extracted absolute cross sections of photoionization and Stark shift respectively. Cross sections of and were determined for the case of photoionizing light at 230 nm, tuned in near resonance with the two-photon transition. Photoionization by 345-nm light resulted in similar cross sections, of and We observed a variation of and with rotational level for photoionization at 230 nm.
© 1999 Optical Society of America
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