High dynamic range isotope ratio measurements using an analog electron multiplier

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985882%3A_____%2F13%3A00387686" target="_blank" >RIV/67985882:_____/13:00387686 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1002/sia.5048" target="_blank" >http://dx.doi.org/10.1002/sia.5048</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/sia.5048" target="_blank" >10.1002/sia.5048</a>

Jazyk výsledku

angličtina

Název v původním jazyce

High dynamic range isotope ratio measurements using an analog electron multiplier

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

High dynamic range isotope ratio measurements using an analog electron multiplier

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JA - Elektronika a optoelektronika, elektrotechnika

OECD FORD obor

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Projekt

<a href="/cs/project/ME%20894" target="_blank" >ME 894: Micro-Faraday array detektor s vysokým dynamickým rozsahem pro multikolekční izotopický SIMS</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Surface and Interface Analysis

ISSN

0142-2421

e-ISSN

—

Svazek periodika

45

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

4

Strana od-do

549-552

Kód UT WoS článku

000319048700140

EID výsledku v databázi Scopus

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