The formulas for the ions responsible for the given peaks have to be determined. Concept Introduction: Mass spectrometry: It is a technique used to find out the molecular weight of the compounds and thus providing the structure and chemical properties of different molecules. The sample ion is converted into gaseous ions with or without fragmentation and are characterized by their charge to mass ratios and relative abundances. Mass spectrum is a plot of the relative abundance of the generated ions as a function of the charge to mass ratio. Electron impact ionization: It is an important technique in mass spectrometry. The sample is first vaporized and converted into ions. This technique involves the bombardment of compound with high energy electrons which carry a high amount of energy. When this much energy strikes the sample molecule, it causes one of the electrons to be ejected. Thus this technique generates both a radical and a cation and is called the molecular ion. Molecular ion is unstable and subject to fragmentation. The mass-charge ratio separates the molecular ion and the cationic fragments.

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Chapter 14, Problem 76CP

Interpretation Introduction

Interpretation: The formulas for the ions responsible for the given peaks have to be determined.

Concept Introduction:

Mass spectrometry:

It is a technique used to find out the molecular weight of the compounds and thus providing the structure and chemical properties of different molecules.

The sample ion is converted into gaseous ions with or without fragmentation and are characterized by their charge to mass ratios and relative abundances.

Mass spectrum is a plot of the relative abundance of the generated ions as a function of the charge to mass ratio.

Electron impact ionization:

It is an important technique in mass spectrometry. The sample is first vaporized and converted into ions. This technique involves the bombardment of compound with high energy electrons which carry a high amount of energy. When this much energy strikes the sample molecule, it causes one of the electrons to be ejected. Thus this technique generates both a radical and a cation and is called the molecular ion.

Molecular ion is unstable and subject to fragmentation. The mass-charge ratio separates the molecular ion and the cationic fragments.

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