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application/vnd.openxmlformats-officedocument.presentationml.presentation ![]() | Presentation | Microsoft PowerPoint 2007 |
application/pdf ![]() | Abstract |
Description
Title: | EVALUATION OF THE EXOTHERMICITY OF THE CHEMI-IONIZATION REACTION Sm + O _ SmO+ + e_ |
Author(s): | Heaven, Michael |
Contributor(s): | Viggiano, Albert; Shuman, Nicholas S.; Ard, Shaun; Melko, Joshua J.; VanGundy, Robert A.; Bartlett, Joshua; Armentrout, Peter B.; Kim, JungSoo; Cox, Richard M |
Subject(s): | Metal containing |
Abstract: | The chemi-ionization reaction Sm + O $rightarrow$ SmO$^{+}$ + e$^{-}$ has been used for chemical release experiments in the thermosphere. This reaction was chosen, in part, because the best available data indicated that it is exothermic by 0.35 $pm$ 0.12 eV. Low ion yields in the initial atmospheric release experiments raised questions concerning the accuracy of the ionization energy (IE) for SmO and the bond dissociation energy (BDE) of SmO$^{+}$. New measurements of the BDE, obtained using a selected ion flow tube and guided ion beam techniques, yielded a more precise value of 5.73 $pm$ 0.07 eV. The ionization energy of SmO was reexamined using pulsed-field ionization zero kinetic energy (ZEKE) photoelectron spectroscopy. The value obtained, 5.7427 $pm$ 0.0006 eV, was significantly higher than the literature value. Combined with literature bond energies of SmO, this IE indicates an exothermicity for Sm + O $rightarrow$ SmO$^{+}$ + e$^{-}$ of 0.14 $pm$ 0.17 eV, independent from and in agreement with the value deduced from the guided ion beam measurements. The implications of these results for interpretation of chemical release experiments are considered. |
Issue Date: | 25-Jun-15 |
Publisher: | International Symposium on Molecular Spectroscopy |
Citation Info: | ACS |
Genre: | Conference Paper / Presentation |
Type: | Text |
Language: | English |
URI: | http://hdl.handle.net/2142/79216 |
Date Available in IDEALS: | 2016-01-05 |