Heat of Formation of OBrO: Experimental Photoionization Study

Autor:	R. Bruce Klemm, R. Peyton Thorn, Thomas J. Buckley, Russell D. Johnson, Louis J. Stief
Rok vydání:	2001
Předmět:	Range (particle radiation) Chemistry Atmospheric chemistry Yield (chemistry) Analytical chemistry Appearance energy Photoionization Physical and Theoretical Chemistry Ionization energy Mass spectrometry Standard enthalpy of formation
Zdroj:	The Journal of Physical Chemistry A. 105:1638-1642
ISSN:	1520-5215 1089-5639
DOI:	10.1021/jp002397z
Popis:	The potential importance of OBrO in atmospheric chemistry has been suggested recently. Although there appear to be no experimental measurements of deltaH(OBrO), estimated values range from 70 to 152 kJ/mol. In the present investigation, the appearance energy (AE) of BrO+ from OBrO was measured by employing a discharge flow-photoionization mass spectrometer that is operated at beamline U-11. The heat of formation was derived from the AE result and the ionization energy of OBrO [IE = 10.29 eV]. The AE experiments yield a threshold at about 98.7 nm that gives, in turn, a value for AH(OBrO) of 180 +/- 10 kJ/mol. The difference with the estimated values mentioned above and the concomitant implications for the atmospheric reactions of OBrO will be discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a5b75e51c4c9cb17a6552a6309059220 https://doi.org/10.1021/jp002397z Zobrazit plný text záznamu