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Intracavity optogalvanic spectroscopy for radiocarbon analysis with attomole sensitivity

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TypeOfResource
Text
TitleInfo
Title
Intracavity optogalvanic spectroscopy for radiocarbon analysis with attomole sensitivity
Identifier
ETD_2148
Identifier (type = hdl)
http://hdl.rutgers.edu/1782.2/rucore10002600001.ETD.000051643
Identifier (type = doi)
doi:10.7282/T3736R4G
Language
LanguageTerm (authority = ISO639-2); (type = code)
eng
Genre (authority = marcgt)
theses
Genre (authority = ExL-Esploro)
ETD doctoral
Subject (authority = RUETD)
Topic
Applied Physics
Subject (authority = ETD-LCSH)
Topic
Radiocarbon dating
Subject (authority = ETD-LCSH)
Topic
Optogalvanic spectroscopy
Abstract
Carbon-14 (radiocarbon) is a naturally occurring radioactive isotope of carbon, having an extremely low natural abundance in living organisms (14C/C ~ 10-12) and a long half life of ~ 5730 years. These properties make it an ideal organic tracer for various applications
in biological, pharmaceutical and environmental sciences as well as carbon dating. Today, the state of the art radiocarbon quantitation technique is Accelerator Mass Spectrometry (AMS) which is based on ion counting using a several megavolt tandem electrostatic accelerator as a mass spectrometer. Although AMS sets the standard for high sensitivity detection, its size, cost and complexity as an analysis system, limits its wide and routine use especially in laboratory or field applications. In this thesis, a new ultrasensitive
laser based analytical technique that can quantify attomoles of 14C in submicrogram samples is demonstrated. The new system exhibits similar or better
measurement capabilities as AMS, in sensitivity (14C/C ≤ 10-15), precision (≤3%) and accuracy (≤5%). Additional advantages include non destructive analysis capability, small size, being a table top instrument, high sample throughput capability via flow processing
and the potential to be coupled to GC/LC instrumentation.
The developed Intracavity Optogalvanic Spectroscopy (ICOGS) system is based on measuring changes in electrical properties of a weakly ionized glow discharge placed inside the cavity of a periodically modulated high power (50 W) 14CO2 laser. This new configuration enabled improvement of the signal detection sensitivity by about six orders of magnitude compared to the conventional external cell optogalvanic spectroscopy
method. The signal enhancement mechanism is similar to, but with key differences from the well studied optical detection method Intracavity Absorption Spectroscopy (ICAS). Measurement capability of this new system is demonstrated with calibration curves
relative to AMS measurements with a dynamic range of more than five orders of magnitude. The systems studied exhibited saturation effects with laser power and
measurement time and also non-linearities in response with samples having enrichments greater than 12 Modern. (1 Modern = 1.10-12 14C/12C ratio.) However, standard operating procedures were developed for accurately measuring unknown samples. For a more thorough quantitative understanding of the enhancement mechanism, a physical rate equations model has been outlined.
PhysicalDescription
Form (authority = gmd)
electronic resource
Extent
x, 95 p. : ill.
InternetMediaType
application/pdf
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text/xml
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references (p. 88-93)
Note (type = statement of responsibility)
by Erhan Ilkmen
Name (type = personal)
NamePart (type = family)
Ilkmen
NamePart (type = given)
Erhan
NamePart (type = date)
1977
Role
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author
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Erhan Ilkmen
Name (type = personal)
NamePart (type = family)
Murnick
NamePart (type = given)
Daniel
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chair
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Advisory Committee
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Daniel Murnick
Name (type = personal)
NamePart (type = family)
Wu
NamePart (type = given)
Zhen
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internal member
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Advisory Committee
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Zhen Wu
Name (type = personal)
NamePart (type = family)
Schaden
NamePart (type = given)
Martin
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internal member
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Advisory Committee
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Martin Schaden
Name (type = personal)
NamePart (type = family)
Hall
NamePart (type = given)
Gene
Role
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internal member
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Advisory Committee
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Gene Hall
Name (type = personal)
NamePart (type = family)
Barat
NamePart (type = given)
Robert
Role
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internal member
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Advisory Committee
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Robert Barat
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School - Newark
Role
RoleTerm (authority = RULIB)
school
OriginInfo
DateCreated (qualifier = exact)
2009
DateOther (qualifier = exact); (type = degree)
2009-10
Place
PlaceTerm (type = code)
xx
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
RelatedItem (type = host)
TitleInfo
Title
Graduate School - Newark Electronic Theses and Dissertations
Identifier (type = local)
rucore10002600001
Location
PhysicalLocation (authority = marcorg); (displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
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Rights

RightsDeclaration (AUTHORITY = GS); (ID = rulibRdec0006)
The author owns the copyright to this work.
Copyright
Status
Copyright protected
Notice
Note
Availability
Status
Open
Reason
Permission or license
Note
RightsHolder (ID = PRH-1); (type = personal)
Name
FamilyName
Ilkmen
GivenName
Erhan
Role
Copyright holder
Telephone
Address
Email
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Type
Permission or license
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DateTime
Detail
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Role
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Name
Erhan Ilkmen
Affiliation
Rutgers University. Graduate School - Newark
AssociatedObject (ID = AO-1); (AUTHORITY = rulib)
Type
License
Name
Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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Technical

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ETD
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application/pdf
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application/x-tar
FileSize (UNIT = bytes)
1484800
Checksum (METHOD = SHA1)
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