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Criegee intermediate formation from ...

Fernandez, Christopher Nathan.

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Criegee intermediate formation from photolytic precursors and characterization of LI/MS instrumentation.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Criegee intermediate formation from photolytic precursors and characterization of LI/MS instrumentation./
Author:	Fernandez, Christopher Nathan.
Description:	331 p.
Notes:	Adviser: Scott Hewitt.
Contained By:	Masters Abstracts International46-04.
Subject:	Chemistry, Analytical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1451782
ISBN:	9780549423140

Criegee intermediate formation from photolytic precursors and characterization of LI/MS instrumentation.
Fernandez, Christopher Nathan.

Criegee intermediate formation from photolytic precursors and characterization of LI/MS instrumentation. - 331 p.

Adviser: Scott Hewitt.

Thesis (M.S.)--California State University, Fullerton, 2008.

The reactions of chlorine atoms (·Cl) with several hydrocarbons, methane, dichloromethane, ethane, dimethyl ether, and toluene, have been investigated as a laser photolysis source of Criegee intermediates (CI), which are a class of reactive species normally involved in the ozonolysis of alkenes in the atmosphere. The detection of secondary ozonides (SOZ), using gas chromatography with flame ionization detection and mass spectrometry, has been used as an indicator of stabilized CI production. Methane and ethane were the only precursors that resulted in detection of SOZ with significantly larger SOZ signals from methane. This is the first unequivocal proof that a Criegee intermediate can be produced in the gas phase from a pathway other than ozone-alkene reactions. A preliminary study comparing the pressure dependence of SOZ produced from ·Cl + methane vs. ozone + ethene has been conducted to determine possible differences in Criegee energetics. A laser ionization/mass spectrometer (LI/MS) has been further characterized to study radicals under atmospheric conditions. The distance required for radical production with respect to the inlet aperture of the mass spectrometer has been estimated. The time-of-flight of the hydroxymethyl radical has been confirmed from previous work. A reinvestigation into the timing of the instrument has been conducted. The implications of these results to the goal of studying CI with the LI/MS are discussed.

ISBN: 9780549423140Subjects--Topical Terms:

586156
Chemistry, Analytical.

Criegee intermediate formation from photolytic precursors and characterization of LI/MS instrumentation.
LDR:02363nam 2200277 a 45 001 958882
005 20110704
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020 $a 9780549423140
035 $a (UMI)AAI1451782
035 $a AAI1451782
040 $a UMI $c UMI
100 1 $a Fernandez, Christopher Nathan. $3 1282344
245 1 0 $a Criegee intermediate formation from photolytic precursors and characterization of LI/MS instrumentation.
300 $a 331 p.
500 $a Adviser: Scott Hewitt.
500 $a Source: Masters Abstracts International, Volume: 46-04, page: 2114.
502 $a Thesis (M.S.)--California State University, Fullerton, 2008.
520 $a The reactions of chlorine atoms (·Cl) with several hydrocarbons, methane, dichloromethane, ethane, dimethyl ether, and toluene, have been investigated as a laser photolysis source of Criegee intermediates (CI), which are a class of reactive species normally involved in the ozonolysis of alkenes in the atmosphere. The detection of secondary ozonides (SOZ), using gas chromatography with flame ionization detection and mass spectrometry, has been used as an indicator of stabilized CI production. Methane and ethane were the only precursors that resulted in detection of SOZ with significantly larger SOZ signals from methane. This is the first unequivocal proof that a Criegee intermediate can be produced in the gas phase from a pathway other than ozone-alkene reactions. A preliminary study comparing the pressure dependence of SOZ produced from ·Cl + methane vs. ozone + ethene has been conducted to determine possible differences in Criegee energetics. A laser ionization/mass spectrometer (LI/MS) has been further characterized to study radicals under atmospheric conditions. The distance required for radical production with respect to the inlet aperture of the mass spectrometer has been estimated. The time-of-flight of the hydroxymethyl radical has been confirmed from previous work. A reinvestigation into the timing of the instrument has been conducted. The implications of these results to the goal of studying CI with the LI/MS are discussed.
590 $a School code: 6060.
650 4 $a Chemistry, Analytical. $3 586156
650 4 $a Chemistry, Physical. $3 560527
690 $a 0486
690 $a 0494
710 2 $a California State University, Fullerton. $3 1017845
773 0 $t Masters Abstracts International $g 46-04.
790 $a 6060
790 1 0 $a Hewitt, Scott, $e advisor
791 $a M.S.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1451782