Measurements of Rate Constants for HO2 + NO and NH2 + NO Reactions by
Time-Resolved Photoionization Mass Spectrometry

Absolute rate constants for HO2 + NO and NH2 + NO reactions were measured by a photoionization mass spectrometry coupled with a laser flash photolysis. HO2 and NH2 radicals were photoionized by an Ar resonance lamp and were detected as their parent ions (HO2+ and NH2+). The rate constants were determined to be K(HO2 + NO)=(6.5 ± 2.0) 10−12cm3molecule−1s−1K(NH2 + NO)=(1.9 ± 0.3) 10−11cm3molecule−1s−1 Both rates are consistent with those previously reported.

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Kinetic studies of C1 and C2 Criegee intermediates with SO2 using laser flash photolysis coupled with photoionization mass spectrometry and time resolved UV absorption spectroscopy

Physical Chemistry Chemical Physics ◽

10.1039/c8cp03115k ◽

2018 ◽

Vol 20 (34) ◽

pp. 22218-22227 ◽

Cited By ~ 6

Author(s):

N. U. M. Howes ◽

Z. S. Mir ◽

M. A. Blitz ◽

S. Hardman ◽

T. R. Lewis ◽

...

Keyword(s):

Flash Photolysis ◽

Laser Flash Photolysis ◽

Kinetic Studies ◽

Laser Flash ◽

Major Product ◽

Time Resolved ◽

Photoionization Mass Spectrometry ◽

Criegee Intermediates ◽

Wide Range ◽

Kinetics Of

Kinetics of CH2OO + SO2 confirmed over a wide range of [SO2]. Acetaldehyde observed as a major product of the reaction of CH3CHOO + SO2.

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Laser flash photolysis determination of absolute rate constants for reactions of bromine atoms in solution

Journal of the American Chemical Society ◽

10.1021/ja00071a048 ◽

1993 ◽

Vol 115 (18) ◽

pp. 8340-8344 ◽

Cited By ~ 26

Author(s):

J. C. Scaiano ◽

M. Barra ◽

M. Krzywinski ◽

R. Sinta ◽

G. Calabrese

Keyword(s):

Rate Constants ◽

Flash Photolysis ◽

Laser Flash Photolysis ◽

Laser Flash ◽

Absolute Rate

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Direct detection of methylphenylgermylene and 1,2-dimethyl-1,2-diphenyldigermene — Kinetic studies of their reactivities in solution

Canadian Journal of Chemistry ◽

10.1139/v06-107 ◽

2006 ◽

Vol 84 (7) ◽

pp. 934-948 ◽

Cited By ~ 13

Author(s):

William J Leigh ◽

Ileana G Dumbrava ◽

Farahnaz Lollmahomed

Keyword(s):

Acetic Acid ◽

Rate Constants ◽

Flash Photolysis ◽

Laser Flash Photolysis ◽

Direct Detection ◽

Kinetic Studies ◽

Laser Flash ◽

Absolute Rate ◽

Hydrocarbon Solvents ◽

Diffusion Controlled

Photolysis of 1,3,4-trimethyl-1-phenylgermacyclopent-3-ene (5) in hydrocarbon solvents containing isoprene, methanol, or acetic acid affords 2,3-dimethyl-1,3-butadiene (DMB) and the expected trapping products of methyl phenylgermylene (GeMePh) in chemical yields exceeding 90%. The germylene has been detected in hexane solution by laser flash photolysis as a short-lived species (τ ~ 2 µs) exhibiting a UV-vis absorption spectrum centered at λmax = 490 nm. It decays with second-order kinetics and a rate constant close to the diffusion-controlled limit, with the concomitant growth of a second longer-lived transient (λmax = 420 nm) that is assigned to a mixture of (E)- and (Z)-1,2-dimethyl-1,2-diphenyldigermene (4). Absolute rate constants have been determined for the reactions of the germylene with primary and tertiary amines (n-BuNH2 and Et3N, respectively), acetic acid (AcOH), a terminal alkyne and alkene, isoprene, DMB, CCl4, and the group 14 hydrides Et3SiH and Bu3SnH. GeMePh is slightly more reactive than GePh2 towards all the reagents studied in this work; both are significantly less reactive than GeMe2 toward the same substrates. Absolute rate constants for the reactions of 4 have also been measured or assigned upper limits in every case and are compared to previously reported values for tetraphenyl- and tetramethyl-digermene with the same reagents.Key words: germylene, digermene, kinetics, laser flash photolysis, germirane, germirene, vinylgermirane, complex, UV–vis spectrum, insertion, addition.

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