   Chapter 3, Problem 170CP

Chapter
Section
Textbook Problem

Gallium arsenide, GaAs, has gained widespread use in semiconductor devices that convert light and electrical signals in fiber-optic communications systems. Gallium consists of 60.% 69Ga and 40.% 71Ga. Arsenic has only one naturally occurring isotope, 75As. Gallium arsenide is a polymeric material, but its mass spectrum shows fragments with the formulas GaAs and Ga2As2. What would the distribution of peaks look like for these two fragments?

Interpretation Introduction

Interpretation: The compound gallium arsenide is widely used in semi-conductors that convert light and electrical signals in fiber-optic communication systems. Gallium consists of the given mass percent of each of the isotope of gallium. The mass spectrum, of gallium arsenide shows fragments with formula, GaAs and Ga2As2 . The distribution of peaks for these two fragments is to be stated.

Concept introduction: The technique that is used for the measurement of the masses of molecules, isotopes or molecular fragments by ionizing the chemical species is known as mass spectrometry. The apparatus used in this process is known as the mass spectrometer.

To determine: The distribution of peaks for the given two fragments, that is GaAs and Ga2As2 , is to be stated.

Explanation

Given

The mass percent of 69Ga in gallium is 60% .

The mass percent of 71Ga in gallium is 40% .

Arsenic has only one naturally occurring isotope, that is, 75As .

For the compound GaAs ,

The mass of 69Ga75As =69+75=144_

The mass of 71Ga75As =71+75=146_

Therefore, two peaks for GaAs will be observed in the mass spectra

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