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Topic: Fluoromethane

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In the News (Mon 22 Jul 19)

  Thermochemical and Chemical Kinetic Data for Fluorinated Hydrocarbons
Fluoromethanes: Abstraction of Hydrogen by F Atoms and Fluorine by H
Fluoromethane decompositions via abstraction of H atoms by H, O, and OH radicals are important pathways.
The fluoromethanes are primarily destroyed in hydrocarbon flames via H atom abstraction by H and OH and through unimolecular decomposition.
www.cstl.nist.gov /div836/836.03/papers/NistTNKinet.html   (10069 words)

The aim of this work is to obtain a distinct picture of the thermochemistry of the relevant species and of the dynamics of the underlying reactions.
This is the region where the first excited state of the fluoromethane ion can be populated as apparent from the TPES (figure 5B).
The kinetic energy released in the F loss reaction from fluoromethane ions has been measured as a function of the internal energy of the parent ions.
userpage.chemie.fu-berlin.de /fb_chemie/ipc/baumgwww/www/Synchrotron/mefpost.htm   (1436 words)

 [No title]   (Site not responding. Last check: 2007-10-15)
Then, a second RIE etch is performed using fluoromethane (CH3F), which forms holes through the portions of the etch stop layer that are exposed through the holes in the insulator layer, down to the interconnect areas of the devices.
This is possible because fluoromethane has a high etch rate for the etch stop layer, but a low etch rate for silicon dioxide.
3c, the etch stop layer 54 is etched using fluoromethane to form a hole 54a which extends down to the silicide interconnect area 18b on the drain 14b.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=99/16118.990401&ELEMENT_SET=DECL   (4149 words)

 Non-metallized and subtoichiometric metallized reactions with ammonia and other weak bases in the dehalogenation of ...
The method of claim 1 wherein the fluoromethane refrigerant is a member selected from the group consisting of chlorodifluoromethane, fluorodichloromethane, chlorofluoromethane, bromofluoromethane, bromodifluoromethane and mixtures thereof.
A method of disposing of hydrofluorocarbon refrigerants, which comprises the steps of providing a refrigerant consisting essentially of a fluoromethane compound having at least one hydrogen atom and one other halogen atom in addition to fluorine, and reacting said compound with a nitrogen-containing base to decompose said compound, said base being non-aqueous.
The method of claim 21 wherein the fluoromethane compound is chlorodifluoromethane and the nitrogen-containing base is ammonia.
www.freepatentsonline.com /5414200.html   (4624 words)

 GSU Chemistry Department Molecular Modeling Exercises   (Site not responding. Last check: 2007-10-15)
The purpose of this exercise is to allow you to look at how the type of atom affects the bond length.
Build and minimize the halogen series of methanes: fluoromethane, chloromethane, bromomethane, and iodomethane.
Which is a better property to use to determine the stability of a compound, the energy or the
chemistry.gsu.edu /glactone/modeling/Luise/genchem/bndlnt2.html   (134 words)

 NLM Technical Bulletin, January - February 1997
Keep in mind that these Locator listings may be several months out-of-date, depending on when you are conducting your search.
See Figure 2 for an example of retrieving on the registry number for fluoromethane in MEDLINE and displaying the Registry Number field containing the Name of Substance.
SS 4 /C? prt include rn PROG: 1 AU - Green T TI - The metabolic activation of dichloromethane and chlorofluoromethane in a bacterial mutation assay using Salmonella typhimurium.
www.nlm.nih.gov /pubs/techbull/jf97/jf97_chem.html   (1268 words)

 CEJ Vol. 8, No. 2 (Serial No. 15). Reg. No. 8-9   (Site not responding. Last check: 2007-10-15)
Thus, the resulting fluoromethane has orbits of various types as collected in Fig.
The fluorine atom in the fluoromethane molecule constructs a one-membered orbit governed by the CR 3v
On the other hand, the three hydrogen atoms in the fluoromethane molecule construct a three-membered orbit governed by the CR 3v
chem.sci.utsunomiya-u.ac.jp /~cej/v8n2/fujita2   (2859 words)

 Letters to the Editor - March 2000   (Site not responding. Last check: 2007-10-15)
I would like to pursue this in greater depth, but right now I need to call my patient and find out how he is doing with a kidney stone.
To me, it makes better sense to have him use a volatile petrochemical that probably won’t hurt his system as much as strong narcotics and a lithothriptor.
He smiles, hands me a stone in a jar, and gives me what is left of the fluoromethane.
www.rollanet.org /~internis/mar00/letters.html   (846 words)

 Oxidative Addition of the Fluoromethane C-F Bond to Pd. An ab Initio Benchmark and DFT Validation Study
Oxidative Addition of the Fluoromethane C-F Bond to Pd. An ab Initio Benchmark and DFT Validation Study
2) for oxidative addition of the fluoromethane C-F bond to the palladium atom and have used this to evaluate the performance of 26 popular density functionals, covering LDA, GGA, meta-GGA, and hybrid density functionals, for describing these reactions.
The ab initio benchmark is obtained by exploring the PES using a hierarchical series of ab initio methods (HF, MP2, CCSD, CCSD(T)) in combination with a hierarchical series of seven Gaussian-type basis sets, up to g polarization.
pubs.acs.org /cgi-bin/abstract.cgi/jpcafh/2005/109/i42/abs/jp053587i.html   (374 words)

 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
Determination of regional cerebral blood flow in patients with cerebral infarction.
Use of fluoromethane labeled with fluorine 18 and positron emission tomography
Preliminary preoperative results of fluoromethane positron emission tomographic determination of perfusion reserve in patients with carotid TIA and stroke
www.osti.gov /energycitations/searchresults.jsp?Author=Nickles,+R.J.   (375 words)

 NGC - NGC Summary   (Site not responding. Last check: 2007-10-15)
Cold or pressure application to the head has been shown to be an effective headache strategy.
Application of vapocoolant spray (fluoromethane) has been demonstrated to decrease myofascial pain in tension-type headache.
The use of cold gel packs is beneficial as a self-help technique.
www.guideline.gov /summary/summary.aspx?ss=15&doc_id=6588&nbr=4148   (2555 words)

 Annual Report, PRFB-33191-B3   (Site not responding. Last check: 2007-10-15)
C gave a chromatogram with three detectable features whose peak spectra suggested their identities to be water, ethylene, and ethyl acetate.
Similar treatment of TMAF generated four detectable gaseous products: water, methanol, trimethylamine, and fluoromethane.
Clearly, the pyrolysis of these melts entails chemistry beyond simple Hoffman degradation, though the details have not been pursued.
www.uncp.edu /home/pwf/prfrep99.htm   (551 words)

 Process for preparing a foamed perfluorocarbon dielectric coaxial cable - Patent 4304713
The process of claim 1 wherein the average particle size of the polytetrafluoroethylene is less than 200 microns.
with a suitable volatile fluid such, for example, as a lower fluorocarbon preferably having one or two carbon atoms--i.e., a fluoromethane represented by the formula: ##STR1## or, preferably, a fluoroethane represented by the formula: ##STR2## where X is selected from the group consisting of fluorine, chlorine, bromine and hydrogen.
Coaxial cables with a foam dielectric between the inner and outer conductors have been in commercial production since at least the 1950's.
www.freepatentsonline.com /4304713.html   (3714 words)

 QSAR - Theory: QSAR+ Descriptors
Fluoromethane has one edge, representing the C-F bond.
For order two, we consider pairs of edges (bonds) in the molecular graph.
Since methane has no bonds and fluoromethane has only one bond, CHI - 2 for methane and fluoromethane are zero.
www.scripps.edu /rc/softwaredocs/msi/cerius45/qsar/theory_descriptors.html   (6749 words)

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