Effects of hydration on reactions of O sup minus (H sub 2 O) sub n (n = 0-2). 1. Temperature dependences of rate constants for reactions with O sub 2 , CO sub 2 , CO, NO, SO sub 2 , CH sub 4 , N sub 2 O, and H sub 2 O

Journal Article · Thu Oct 18 00:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100384a039· OSTI ID:6045347

Viggiano, A A; Morris, R A; Deakyne, C A; Dale, F; Paulson, J F ^[1]

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1. Ionospheric Physics Div., Hanscom AFB, MA (USA)

The effect of hydration on the reactivity of O{sup {minus}}(H{sub 2}O){sub n} (n = 0-2) with the neutrals O{sub 2}, CO{sub 2}, CO, NO, SO{sub 2} CH{sub 4}, N{sub 2}O, and H{sub 2}O has been investigated as a function of temperature. Rate constants for the above reactions were measured at 251, 343, and 473 K ({sup {minus}}(H{sub 2}O){sub 2} reactions were studied at 251 and 343 K only) by using a variable-temperature fast-flow system that incorporates optionally either a selected ion source or a high-pressure ion source. Hydration of O{sup {minus}} was found to decrease the reactivity for the neutrals CO, SO{sub 2}, CH{sub 4} and N{sub 2}O. For reactions of O{sup {minus}}(H{sub 2}O){sub n} with O{sub 2} and CO{sub 2}, no reaction was observed for n = 0, but hydration of O{sup {minus}} enabled reaction to proceed for O{sup {minus}}(H{sub 2}O){sub 1,2}. For reaction with NO, addition of one H{sub 2}O ligand to O{sup {minus}} increased the reactivity, while addition of a second H{sub 2}O caused a decrease in the rate constant to a value below that of the unsolvated O{sup {minus}}. No reaction was observed for any of the ions O{sup {minus}}(H{sub 2}O){sub 0-2} with H{sub 2}O. Temperature dependences of the rate constants were found to vary depending on the system.

• OSTI ID: 6045347
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:21; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
DATA
ELEMENTS
EXPERIMENTAL DATA
HYDRATION
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
KINETICS
MEASURING METHODS
MEDIUM TEMPERATURE
METHANE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
REACTION KINETICS
SOLVATION
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE DEPENDENCE
WATER