Gas-phase reactions of AlO with small molecules

Journal Article · Thu Nov 30 04:00:00 EST 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100361a017· OSTI ID:7157939

Parnis, J M; Mitchell, S A; Kanigan, T S; Hackett, P A ^[1]

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1. National Research Council of Canada, Ottawa, Ontario (Canada)

AlO is produced in the gas phase at 296 K by reaction of Al atoms with N{sub 2}O following Al atom formation by multiphoton dissociation of trimethylaluminum (TMA). Production and decay of Al and AlO are monitored by laser-induced fluorescence. The combination of efficient vibrational relaxation of AlO by N{sub 2}O and low reactivity of AlO with N{sub 2}O at room temperature allows studies of AlO reaction kinetics to be carried out with a range of molecules using N{sub 2}O as a buffer gas. Second-order rate constants at 296 K (cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}) are reported for the reactions of ground-state Al(3{sup 2}P{sub j}) with N{sub 2}O, (1.1 {plus minus} 0.1) {times} 10{sup {minus}11}; ethylene oxide, (1.3 {plus minus} 0.1) {times} 10{sup {minus}10}, and TMA, (1.3 {plus minus} 0.3) {times} 10{sup {minus}10} in Ar buffer gas, and for reactions of ground-state AlO(X{sup 2}{Sigma}{sup +}, v = O) with ethylene oxide, (2.1 {plus minus} 0.5) {times} 10{sup {minus}10}; tetramethylethylene, (1.1 {plus minus} 0.4) {times} 10{sup {minus}11}; and TMA, (3.0 {plus minus} 1.0) {times} 10{sup {minus}10} in N{sub 2}O buffer gas. A third-order rate constant of (4.3 {plus minus} 0.4) {times} 10{sup {minus}32} cm{sup 6} molecule{sup {minus}2} s{sup {minus}1} is reported for the AlO + CO association reaction in N{sub 2}O buffer gas. Reactions of AlO with CO{sub 2} and C{sub 2}H{sub 4} showed buffer gas pressure dependent pseudo-second-order rate constants, indicative of processes involving formation of association complexes. Estimates are made of the upper limits for the rate constants for reaction of AlO with N{sub 2}O, methane, molecular hydrogen, isobutane, benzene, toluene, CF{sub 2}Cl, CF{sub 3}Br, and CCl{sub 4}, for which the reaction rates at 296 K were negligible.

• OSTI ID: 7157939
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:24; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000 -- Chemistry
400500 -- Photochemistry
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BENZENE
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
DATA
DATA ANALYSIS
DECAY
ELEMENTS
EMISSION SPECTROSCOPY
ETHANE
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
HYDROCARBONS
HYDROGEN
INFORMATION
KINETICS
MEASURING INSTRUMENTS
MEASURING METHODS
METHANE
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PRODUCTION
REACTION KINETICS
SPECTROSCOPY