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Mass Spectroscopy Detection

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Questions and Answers

What is the primary function of the ion repeller in a mass spectrometer?

To deflect the ions according to their masses

To accelerate the ions to the same kinetic energy

To persuade the positive ions out of the ionisation chamber (correct)

To ionize the sample particles

What type of compounds are more likely to form multiple charged ions?

Hetero aromatic compounds (correct)

Inorganic compounds

Homo aromatic compounds

Aliphatic compounds

What is the typical charge carried by most positive ions formed in a mass spectrometer?

+1 (correct)

Variable

What is the reason for the predominance of positive ions in electronic impact ionization?

Greater stability Signup and view all the answers

What determines the amount of deflection of ions in a magnetic field in a mass spectrometer?

Both the mass of the ion and the number of positive charges Signup and view all the answers

What determines the amount of deflection of an ion in a mass spectrometer?

The mass and charge of the ion Signup and view all the answers

What is the purpose of the three slits with voltage in the decreasing order in a mass spectrometer?

To focus the ions into a finely focused beam Signup and view all the answers

What is the characteristic of metastable ions in terms of kinetic energy?

Lower kinetic energy than normal ions Signup and view all the answers

What is the process by which metastable ions arise?

Fragmentation during the flight down through the ion Signup and view all the answers

How do mass spectrometers typically work with ions?

With positive ions only Signup and view all the answers

What happens to ions that collide with the walls of the mass spectrometer?

They are neutralized and removed by the vacuum pump Signup and view all the answers

What is the result of bombarding molecules with an electron beam of energy between 10-15ev?

Formation of molecular ions Signup and view all the answers

What is the ultimate goal of the acceleration process in a mass spectrometer?

To give all ions the same kinetic energy Signup and view all the answers

What is the characteristic of metastable peaks in a mass spectrum?

They are smaller and broader than M1 and M2 peaks Signup and view all the answers

What is the purpose of studying negative ions in mass spectrometry?

Not very useful in structural determinations Signup and view all the answers

What is the process called when molecular ions break down into various fragments due to high excitation?

Fragmentation Signup and view all the answers

What is the type of ion that is formed when a molecule is ionized by removal of one electron?

Molecular ion Signup and view all the answers

What is detected as an electric current in the mass spectrometer?

The flow of electrons Signup and view all the answers