MEASUREMENT OF THE ELECTRON BINDING ENERGY OF SIZE SELECTED IBr$^-$(CO$_2$)$_n$ CLUSTERS THROUGH ANION PHOTOELECTRON IMAGING

We report the measurement of the electron binding energies of size selected IBr $-$ (CO $2$ ) $n$ , n$< $10 c l u s t e r a n i o n s . T h e d a t a a r e i n t e r p r e t e d u s i n g a b i n i t i o c a l c u l a t i o n s a n d F r a n c k − C o n d o n s i m u l a t i o n s t o a s s i s t i n t h e a s s i g n m e n t o f t h e p h o t o e l e c t r o n s p e c t r a . T h e I B r (C O$ _2 $)$ _n$ anion are formed by a 1 kV electron impact on dilute IBr and CO $2$ in a pulsed supersonic expansion. Time-of-flight mass spectrometry allows a size-selected cluster anion to interact with a pulsed ultraviolet laser radiation tunable between 210 and 320 nm. The photodetached electrons are energy analyzed using a photoelectron imaging spectrometer operating in the velocity map imaging mode. The spectrometer determines electron kinetic energy, with an energy resolution of 2.5 percent. Trends in electron binding energy as a function of size will be discussed in regard to the trend that develops upon the addition of each cluster, and compared to previous photoelectron spectroscopy of I $2−$ (CO $2$ ) $n$ clusters. Supported by NSF and AFOSR.

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Author Institution: JILA and Department of Chemistry and Biochemistry, University of Colorado and National Institute of Standards and Technology, Campus Box 440, University of Colorado, Boulder, Colorado 80309-0440

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http://hdl.handle.net/1811/30768

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Abstracts of OSU International Symposium on Molecular Spectroscopy 2000-2009

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