Reevaluation of the use of photoelectron angular distributions as a probe of dynamical processes: strong dependence of such distributions from s₁ paradifluorobenzene on photoelectron kinetic energy
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2003
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Bellm, S.
Reid, K.
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Physical Review Letters, 2003; 91(26):263002-1-263002-4
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Susan M. Bellm and Katharine L. Reid
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Abstract
Photoelectron angular distributions (PADs) have been measured following the excitation of the S₁ origin band in paradifluorobenzene using a range of ionizing wavelengths and for resolved ion vibrational states. The PADs show a dramatic sensitivity to the photoelectron kinetic energy over an energy range of at least 1 eV from threshold, and almost no sensitivity to any prepared intermediate state alignment. This has important consequences for those studies of intramolecular dynamics that use PADs. We suggest that the observed behavior is caused by a shape resonance in the continuum.
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©2003 American Physical Society