Study of isotope effects in the photoionization of HI and DI using phase lag spectroscopy

Khachatrian, Ani; Billotto, Richard; Zhu, Langchi; Gordon, Robert J.; Seideman, Tamar
June 2002
Journal of Chemical Physics;6/1/2002, Vol. 116 Issue 21, p9326
Academic Journal
Phase lag spectroscopic measurements are performed for HI and DI in the 5d(π, δ) resonance region. Measurements of the phase lags for both molecules reveals a strong isotopic effect, especially pronounced in the ionization channel. The energy dependence of the phase lag provides clear examples of continuum and resonance coupling effects that were previously predicted theoretically but have not yet been observed. It is demonstrated that phase lag spectroscopy is a sensitive technique for studying properties of molecular continua, furnishing information that is not available from phase-insensitive observables.


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