Welcome to the Quiz!

This quiz contains 11 questions from a mix of 1 subtopics.

What is the correct order of stages in TOF mass spectrometry?

detection; ionisation; acceleration; ion drift

ionisation; ion drift; acceleration; detection

ionisation; detection; ion drift; acceleration

ionisation; acceleration; ion drift; detection

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TOF mass spectrometry is used to determine what property of an ion?

mass to shape ratio

mass to size ratio

mass to charge ratio

shape to charge ratio

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Which species could be accelerated using the electric field of a TOF mass spectrometer?

Cl2

Cl2-

Cl2+

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Select the correct statement about the time taken for different ions to reach the detector in a TOF mass spectrometer.

40Ar2+ would be detected before 40Ar+ but later than 20Ne+

40Ar2+ would be detected at the same time as 40Ar+ but later than 20Ne+

40Ar2+ would be detected before 40Ar+ but at the same time as 20Ne+

40Ar2+ would be detected after 40Ar+ but sooner than 20Ne+

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What is the molecular ion peak in mass spectrometry?

the most intense peak in the mass spectrum

the peak corresponding to the ion with the highest mass-to-charge ratio (m/z) 

the peak corresponding to the base peak in the spectrum

the peak corresponding to the lightest ion in the sample

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Relative abundance is the axis of a mass spectrum.

vertical

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Mass-to-charge ratio is the axis of a mass spectrum.

horizontal

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What assumption is made when performing time-of-flight calculations?

all ions have the same isotopic mass

all ions have the same velocity

all ions enter the flight tube at the same time

all ions have the same kinetic energy

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What is the correct formula for time of flight, t?

t=d×2Ekm
t=d×m2Ek
t=m×d2Ek
t=m×2Ekd

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How is the mass, in kg, of an ion calculated from its relative isotopic mass?

divide by 1,000, then multiply by Avogadro's constant

divide by 1,000, then divide by Avogadro's constant

multiply by 1,000, then multiply by Avogadro's constant

multiply by 1,000, then divide by Avogadro's constant

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What label is given to the molecular ion peak?

M+

m

m+

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