High-resolution UV photoelectron spectroscopy of diatomic halogens |
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Authors: | H. Van Lonkhuyzen C.A. De Lange |
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Affiliation: | Department of Physical Chemistry, Free University, de Boelelaan 1083, 1081 HV Amsterdam, The Netherlands |
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Abstract: | Diatomic halogens are studied with UV photoelectron spectroscopy using new techniques to preserve high resolution even for reactive species. For the first time vibrational structure is observed on the 2Πu,i (i = 1/2,3/2) states (F2+, Cl2+), the 2Σg+ states (F2+, Cl2+) and the Br2+ (2Πu,) state. On the 2Πu,i states (F2+, Cl2+, Br2+) spin-orbit splitting is resolved. Indications for a small potential barrier on the F2+ (2Πu,i) state for large internuclear distances are found. A new value for the spin-orbit splitting of the Cl2+(2Πg) state is presented (= ?725 cm?1). The complementary nature of optical emission and photoelectron spectroscopy for small ions is demonstrated leading to a more complete picture of the F2+ (2Πu,i) and Cl2+ (2Πu,i) ionic states. |
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