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Atmospheric chemistry of ozone react...

Orzechowska, Grazyna Elzbieta.

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Atmospheric chemistry of ozone reactions with alkenes.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Atmospheric chemistry of ozone reactions with alkenes./
作者:	Orzechowska, Grazyna Elzbieta.
面頁冊數:	189 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2679.
Contained By:	Dissertation Abstracts International64-06B.
標題:	Chemistry, Organic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3094202

Atmospheric chemistry of ozone reactions with alkenes.
Orzechowska, Grazyna Elzbieta.

Atmospheric chemistry of ozone reactions with alkenes. - 189 p.

Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2679.

Thesis (Ph.D.)--University of California, Los Angeles, 2003.

The present dissertation considers the reaction mechanisms of C 2 to C10 organics as they are relevant to the chemistry of the Earth's atmosphere. I address topics such as radical formation in the troposphere and sources of acidity and particles in the air we breathe. The objectives of studies were to elucidate mechanisms of the gas-phase reactions of ozone with selected alkenes and quantify these reactions products.Subjects--Topical Terms:

516206
Chemistry, Organic.

Atmospheric chemistry of ozone reactions with alkenes.
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100 1 $a Orzechowska, Grazyna Elzbieta. $3 1899895
245 1 0 $a Atmospheric chemistry of ozone reactions with alkenes.
300 $a 189 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2679.
500 $a Co-Chairs: Suzanne E. Paulson; Peter M. Felker.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2003.
520 $a The present dissertation considers the reaction mechanisms of C 2 to C10 organics as they are relevant to the chemistry of the Earth's atmosphere. I address topics such as radical formation in the troposphere and sources of acidity and particles in the air we breathe. The objectives of studies were to elucidate mechanisms of the gas-phase reactions of ozone with selected alkenes and quantify these reactions products.
520 $a The formation of acetone from the reaction of selected monoterpenes (α-pinene, β-pinene, myrcene, terpinolene, and Δ<super>3</super>-carene) with ozone in the presence of an OH scavenger is described in Chapter II. Acetone is a relatively long-lived species that when transported to the upper troposphere acts as a source of radicals. Most acetone is produced via straight forward decomposition of the primary ozonide formed from methyl substituted internal alkenes, but for some alkenes yields of acetone arise from alkoxy radical rearrangements later in the reaction chain. For instance, Δ<super>3</super>-carene produces surprisingly high acetone yields via rearrangement of a cyclopropyl carbinyl radical.
520 $a Chapter III contains results from high-accuracy measurements of OH radical formation from a series of internal alkenes relevant particularly to urban air and from a series of styrenes. The styrenes were included in the study for their potential to provide structurally-based mechanistic insights. The resulting data reveals that subtle changes around the double bond have significant effect on OH formation yields. The relationship between structure of these alkenes and OH formation and OH production for the conditions in Los Angeles is discussed.
520 $a The reaction of ozone with alkenes under humid conditions, have been highly debated as potential sources of organic acids in the atmosphere. The formation (or lack) of acids from alkene ozonolysis allows key insights to be made into the reaction mechanism. Two analytical methods: a solid phase microextraction-SPME (Chapter IV) and a GC in-inlet derivatization (Chapter V) were developed to monitor and quantify acid formation. Carboxylic acids, products of the reaction of ozone with selected alkenes in the presence of an OH scavenger under dry (RH < 1%) and humid (RH = 65%) conditions were identified and quantified. My results indicate that acids yields under atmospheric conditions are generally low, around 5% or less, and that acids are most likely formed from direct rearrangement of one of the ozonolysis products, rather than a reaction involving water.
590 $a School code: 0031.
650 4 $a Chemistry, Organic. $3 516206
650 4 $a Physics, Atmospheric Science. $3 1019431
690 $a 0490
690 $a 0608
710 2 0 $a University of California, Los Angeles. $3 626622
773 0 $t Dissertation Abstracts International $g 64-06B.
790 1 0 $a Paulson, Suzanne E., $e advisor
790 1 0 $a Felker, Peter M., $e advisor
790 $a 0031
791 $a Ph.D.
792 $a 2003
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