(a) Interpretation: The type of mass spectrum used for molecular mass of compound and reason for using this mass spectrum is to be stated. Concept introduction: The mass spectrum of a compound is obtained by the ionization of the compound. The ionization can be done by using electron ionization or chemical ionization. The type in which the spectrum of compound obtained is simple and the process of the method is easy.

BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213
BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

Solutions

Chapter 20, Problem 20.19QAP
Interpretation Introduction

(a)

Interpretation:

The type of mass spectrum used for molecular mass of compound and reason for using this mass spectrum is to be stated.

Concept introduction:

The mass spectrum of a compound is obtained by the ionization of the compound. The ionization can be done by using electron ionization or chemical ionization. The type in which the spectrum of compound obtained is simple and the process of the method is easy.

Interpretation Introduction

(b)

Interpretation:

The type of mass spectrum used for the chemical structure of the compound and reason for using this is to be stated.

Concept introduction:

The chemical structure of the compound consists of the different orientation of atoms in a compound. The analysis of every atom is done to obtain a chemical structure of compound because a particular atom behaves differently with a different atom in the compound. The method used for the mass spectrum for the chemical structure of the compound should be such that the orientation of every atom can be analyzed separately.

Interpretation Introduction

(c)

Interpretation:

The flight time for ion in TOF mass analyzer is to be stated.

Concept introduction:

In TOF mass analyzer positive ions are produced by bombarding the electrons or photons on molecules of a compound. These produced ions then accelerated in the drift tube due to the electric field applied. The ions in the tube are separated on the basis of their masses. The kinetic energies of all the ions in the tube are the same because all ions are under the effect of the same electric field. The velocities of ions are in an inverse of their masses.

Interpretation Introduction

(d)

Interpretation:

The derivation of an equation for the differences in flight times as a function of two masses, charges and accelerating voltage is to be stated.

Concept introduction:

The ion in the tube of mass analyzer consists of kinetic energy and potential energy. The potential energy is due to charged electrons and kinetic energy due to the mass of ions. The difference in flight times is obtained by finding the flight time of each ion separately.

Interpretation Introduction

(e)

Interpretation:

The difference between flight time for ions of mass to charge ratios m1/z and m2/z is to be stated.

Concept introduction:

The difference in flight time for ions depends on mass of ions, charge of electrons and accelerating voltage in the tube. It is given by the formula t2=(mz)(L22V).

Interpretation Introduction

(f)

Interpretation:

The type of ionization source in tendom mass spectrometer and reason for using this is to be stated.

Concept introduction:

The mass spectrum is the plot between the relative abundance and mass to charge ratio. The mass spectrum is different for the same substance. The relative abundance represents the y-axis and the mass to charge ratio represents the x-axis. The heights of the peaks represent the relative intensity. The peak with the highest value in the plot is called the base peak. All the calculations are made with respect to this base peak. The structural information can be obtained by fragmentation of molecules in the sample.

Interpretation Introduction

(g)

Interpretation:

The types of mass spectra obtained from the MS/MS experiment is to be stated.

Concept introduction:

The mass spectrometry is a technique used to find the structure and chemical properties of different molecules. In the process of mass spectrometry, different molecules are converted into ions. The ions are separated by the mass to charge ratio and detected by relative abundance in the sample. The mass spectrum of ion is obtained by plotting the mass to charge ratio and relative abundance of the ion in a sample.

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