Infrared diode laser studies of the products from the reaction CH{sub 2}({tilde X}{sup 3}B{sub 1}) + O{sub 2} and from the near-UV photolysis of CH{sub 3}NCS [electronic resource].
- Published
- Washington, D.C. : United States. Dept. of Energy, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description
- 101 pages : digital, PDF file
- Additional Creators
- Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- Absolute yields of CO, CO₂, and H₂CO formed in reaction of triplet methylene ({tilde X} ³B₁ {triple_bond} CH₂) with O₂ were determined using a flash kinetic spectrometer. CH₂ radicals were generated by excimer laser photolysis of ketene and product formation was monitored by time-resolved infrared diode laser absorption. Reaction was carried out in a static gas cell at room temperature at 1--25 torr. Measured product yields were CO, 0.34 ± 0.06; CO₂, 0.40 ± 0.08 H₂CO, 0.16 ± 0.04. Rate constants for production of CO and CO₂ were equivalent to the published rate constant for removal of CH₂. Indirect evidence indicated that yield of OH is 0.30 ± 0.05. Ultraviolet spectrum of methyl isothiocyanate (CH₃NCS {triple_bond} MITC) and quantum yield for dissociation into methyl isocyanide (CH₃NC) and atomic sulfur at 308 nm, Φ 0.98 ± 0.24, were measured. MITC is widely used as a fumigant and readily enters the atmosphere during and after application. Results indicate that photodissociation by sunlight is an effective pathway for removal of MITC from atmosphere. A mechanism is proposed to account for the observed formation of methyl isocyanate (CH₃NCO) as a secondary product in controlled laboratory studies.
- Report Numbers
- E 1.99:lbl--34918
lbl--34918 - Subject(s)
- Other Subject(s)
- Dissertation Note
- Thesis (Ph.D); PBD: Dec 1993
- Note
- Published through SciTech Connect.
12/01/1993.
"lbl--34918"
"DE94005217"
Alvarez, R.A. - Funding Information
- AC03-76SF00098
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