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What mass differences can just be resolved at m values of 100,1000,2000,3000and 5000if the mass spectrometer has a resolution of

(a) 500(b) 1000(c) 3000(d) 5000?

Short Answer

Expert verified

The mass difference calculation for the given data is:

Step by step solution

01

Mass difference

A common approach for obtaining a known amount (mass) of substance. A sample of material is introduced to a container that has been "massed," and the container is then "remassed." The mass of the sample is the difference between the starting and final masses.

02

Calculation of the resolution of spectrophotometer

The formula for calculating the resolution of spectrophotometer is :

R=mm

In this formula, Ris the resolution, mis nominal mass of the first peak and mis the mass difference between two adjacent peaks.

03

Calculation being done

The calculation of the mass difference is shown as

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Most popular questions from this chapter

Figure 20-29(page 536) shows the mass spectrum of the same compound from an EI source and a CI source.

a. Which mass spectrum would be best for determining the molecular mass of the compound? Why?

b. Which mass spectrum would be best for determining the chemical structure? Why?

c. The EI source was a pulsed source used with a TOF mass analyzer. If the flight tube were 1.0m long and the accelerating voltage were 3000V, what would the flight time be for the ion at m/z=58?

d. For two ions of m/z values m1zand localid="1646035174939" m2z, derive an equation for the difference in flight times tFas a function of the two masses, the charges, and the accelerating voltage.

e. For the same TOF analyzer as in part (c), calculate the difference in flight times between ions of m1/zand m2/z

f. To get more structural information, the compound of Figure 20-27was subjected to tandem mass spectrometry. Which ionization source, EI or CI, would be most suitable for this purpose? Why?

g. Using the ionization source chosen in part (f), describe the types of mass spectra that could be obtained from an MS/MS experiment by:

1. holding the first mass analyzer constant and scanning the second analyzer.

2. scanning both analyzers with a small m/z offset between them.

3. scanning the first analyzer while holding the second analyzer constant.

4. scanning the second mass analyzer for every mass selected by the first analyzer.

In your answer, use features of the mass spectrum of Figure 20-29 to illustrate your description.

Describe the difference between gaseous field ionization sources and field desorption sources.

How do gaseous and desorption sources differ? What are the advantages of each?

The following figure is a simplified diagram of a commercially available EI source.
(a) What voltage must be applied between the filament and target so that electrons interacting with molecules
at the point marked SS (sample source) will have 70 eV of kinetic energy?
(b) What will happen to a molecule that diffuses toward the filament and is ionized at point P?

How do gaseous and desorption sources differ? What are the advantages of each?

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