國立虎尾科技大學 |

Electron probe sub-micron analysis in geoscience : = Problems and potential solutions of low voltage electron microprobe analysis, as applied to reduced lunar phases and pyroxene lamellae.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Electron probe sub-micron analysis in geoscience :/
Reminder of title:	Problems and potential solutions of low voltage electron microprobe analysis, as applied to reduced lunar phases and pyroxene lamellae.
Author:	Gopon, Phillip N.
Description:	1 online resource (201 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.
Contained By:	Dissertation Abstracts International78-01B(E).
Subject:	Geology. -
Online resource:	click for full text (PQDT)
ISBN:	9781369098891

Electron probe sub-micron analysis in geoscience : = Problems and potential solutions of low voltage electron microprobe analysis, as applied to reduced lunar phases and pyroxene lamellae.
Gopon, Phillip N.

Electron probe sub-micron analysis in geoscience :Problems and potential solutions of low voltage electron microprobe analysis, as applied to reduced lunar phases and pyroxene lamellae. - 1 online resource (201 pages)

Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

Conventional electron-probe microanalysis (EPMA) has an X-ray analytical spatial resolution on the order of 1-4 mum width/depth. Many of the naturally occurring Fe-Si compounds analyzed in this study are smaller than 1 im in size, requiring the use of lower accelerating potentials and non-standard X-ray lines for analysis. The problems with the use of low energy Xray lines (soft X-rays) of iron for quantitative analyses are discussed and a review is given of the alternative X-ray lines that may be used for iron at or below 5 keV (i.e., accelerating voltage that allows analysis of areas of interest smaller than 1 mum). Problems include the increased sensitivity to surface effects for soft X-rays, peak shifts (induced by chemical bonding, differential selfabsorption, and/or buildup of carbon contamination), uncertainties in the mass attenuation coefficient (MAC) for X-ray lines near absorption edges, and issues with spectral resolution and count rates from the available Bragg diffractors. In addition to the results from the traditionally used Fe Lalpha line, alternative approaches, utilizing Fe Lbeta, and Fe Ll-n lines, are discussed.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369098891Subjects--Topical Terms:

670379
Geology.
Index Terms--Genre/Form:

554714
Electronic books.

Electron probe sub-micron analysis in geoscience : = Problems and potential solutions of low voltage electron microprobe analysis, as applied to reduced lunar phases and pyroxene lamellae.
LDR:02577ntm a2200349Ki 4500 001 911502
005 20180529094435.5
006 m o u
007 cr mn||||a|a||
008 190606s2016 xx obm 000 0 eng d
020 $a 9781369098891
035 $a (MiAaPQ)AAI10154796
035 $a (MiAaPQ)wisc:13949
035 $a AAI10154796
040 $a MiAaPQ $b eng $c MiAaPQ
099 $a TUL $f hyy $c available through World Wide Web
100 1 $a Gopon, Phillip N. $3 1183367
245 1 0 $a Electron probe sub-micron analysis in geoscience : $b Problems and potential solutions of low voltage electron microprobe analysis, as applied to reduced lunar phases and pyroxene lamellae.
264 0 $c 2016
300 $a 1 online resource (201 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.
500 $a Advisers: John W. Valley; John H. Fournelle.
502 $a Thesis (Ph.D.) $c The University of Wisconsin - Madison $d 2016.
504 $a Includes bibliographical references
520 $a Conventional electron-probe microanalysis (EPMA) has an X-ray analytical spatial resolution on the order of 1-4 mum width/depth. Many of the naturally occurring Fe-Si compounds analyzed in this study are smaller than 1 im in size, requiring the use of lower accelerating potentials and non-standard X-ray lines for analysis. The problems with the use of low energy Xray lines (soft X-rays) of iron for quantitative analyses are discussed and a review is given of the alternative X-ray lines that may be used for iron at or below 5 keV (i.e., accelerating voltage that allows analysis of areas of interest smaller than 1 mum). Problems include the increased sensitivity to surface effects for soft X-rays, peak shifts (induced by chemical bonding, differential selfabsorption, and/or buildup of carbon contamination), uncertainties in the mass attenuation coefficient (MAC) for X-ray lines near absorption edges, and issues with spectral resolution and count rates from the available Bragg diffractors. In addition to the results from the traditionally used Fe Lalpha line, alternative approaches, utilizing Fe Lbeta, and Fe Ll-n lines, are discussed.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Geology. $3 670379
650 4 $a Geochemistry. $3 648291
655 7 $a Electronic books. $2 local $3 554714
690 $a 0372
690 $a 0996
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a The University of Wisconsin - Madison. $b Geoscience. $3 1183368
773 0 $t Dissertation Abstracts International $g 78-01B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10154796 $z click for full text (PQDT)