About: High dynamic range isotope ratio measurements using an analog electron multiplier

Facets (new session)
Description
Metadata
Settings
- owl:sameAs
- Inference Rule:

About: High dynamic range isotope ratio measurements using an analog electron multiplier Goto Sponge NotDistinct Permalink

An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	We have explored measurement and accuracy issues in the use of an electron multiplier (EM) detector as a fast analog amplifier rather than in pulse-counting mode. EM on a Cameca IMS 3f instrument was modified to allow both analog and digital signals to be recorded simultaneously. The digital signal was picked up on the last dynode and the analog signal was recorded at the anode (operated near ground potential). The digital signal was differentiated to convert the positive pulse at the last dynode to a negative-going signal that could be processed by the digital electronics of the IMS 3f and fed into the pulse counting system. The analog signal was amplified by an operational amplifier with a 106 ohm feedback resistor and the resulting signal was fed into the voltage/frequency convertor that normally processes the electrometer output from the Faraday cup collector. Isotope ratio measurements were explored for negative ion signals of the silicon and sulfur isotopes under Cs+ primary ion bombardment. For 32S and 34S signals of 3 _ 107 and 1.3 _ 106 counts/s respectively and 1 s counting times for each isotope, the standard deviations of the means of 140 ratio measurements averaged 0.3 per mil. Measurements on two sulfide samples with isotope ratios previously determined to differ by 13.6 per mil were within 1.2_0.5 per mil of the previous difference value. Sources of residual error are discussed We have explored measurement and accuracy issues in the use of an electron multiplier (EM) detector as a fast analog amplifier rather than in pulse-counting mode. EM on a Cameca IMS 3f instrument was modified to allow both analog and digital signals to be recorded simultaneously. The digital signal was picked up on the last dynode and the analog signal was recorded at the anode (operated near ground potential). The digital signal was differentiated to convert the positive pulse at the last dynode to a negative-going signal that could be processed by the digital electronics of the IMS 3f and fed into the pulse counting system. The analog signal was amplified by an operational amplifier with a 106 ohm feedback resistor and the resulting signal was fed into the voltage/frequency convertor that normally processes the electrometer output from the Faraday cup collector. Isotope ratio measurements were explored for negative ion signals of the silicon and sulfur isotopes under Cs+ primary ion bombardment. For 32S and 34S signals of 3 _ 107 and 1.3 _ 106 counts/s respectively and 1 s counting times for each isotope, the standard deviations of the means of 140 ratio measurements averaged 0.3 per mil. Measurements on two sulfide samples with isotope ratios previously determined to differ by 13.6 per mil were within 1.2_0.5 per mil of the previous difference value. Sources of residual error are discussed (en)
Title	High dynamic range isotope ratio measurements using an analog electron multiplier High dynamic range isotope ratio measurements using an analog electron multiplier (en)
skos:prefLabel	High dynamic range isotope ratio measurements using an analog electron multiplier High dynamic range isotope ratio measurements using an analog electron multiplier (en)
skos:notation	RIV/67985882:_____/13:00387686!RIV14-MSM-67985882
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(ME 894)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Lörinčík, Jan
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fotoniky a elektroniky AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	77331
http://linked.open...ai/riv/idVysledku	RIV/67985882:_____/13:00387686
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Isotope ratios; electron multiplier; dynamic range (en)
http://linked.open.../riv/klicoveSlovo	dynamic range Isotope ratios electron multiplier
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[D9F8A89C7169]
http://linked.open...i/riv/nazevZdroje	Surface and Interface Analysis
http://linked.open...in/vavai/riv/obor	JA
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	http://linked.opendata.cz/resource/domain/vavai/projekt/ME%20894
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	45
http://linked.open...iv/tvurceVysledku	Williams, P. Lorinčík, Jan Franzreb, K. Herwig, R.
http://linked.open...ain/vavai/riv/wos	000319048700140
issn	0142-2421
number of pages	4 (xsd:int)
http://bibframe.org/vocab/doi	10.1002/sia.5048

Faceted Search & Find service v1.16.118 as of Jun 21 2024

Alternative Linked Data Documents: ODE Content Formats:

RDF

ODATA

Microdata

About

OpenLink Virtuoso version 07.20.3240 as of Jun 21 2024, on Linux (x86_64-pc-linux-gnu), Single-Server Edition (126 GB total memory, 58 GB memory in use)
Data on this page belongs to its respective rights holders.
Virtuoso Faceted Browser Copyright © 2009-2024 OpenLink Software