18 Questions
What is the primary function of the ion repeller in a mass spectrometer?
To persuade the positive ions out of the ionisation chamber
What type of compounds are more likely to form multiple charged ions?
Hetero aromatic compounds
What is the typical charge carried by most positive ions formed in a mass spectrometer?
+1
What is the reason for the predominance of positive ions in electronic impact ionization?
Greater stability
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
What determines the amount of deflection of an ion in a mass spectrometer?
The mass and charge of the ion
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
What is the characteristic of metastable ions in terms of kinetic energy?
Lower kinetic energy than normal ions
What is the process by which metastable ions arise?
Fragmentation during the flight down through the ion
How do mass spectrometers typically work with ions?
With positive ions only
What happens to ions that collide with the walls of the mass spectrometer?
They are neutralized and removed by the vacuum pump
What is the result of bombarding molecules with an electron beam of energy between 10-15ev?
Formation of molecular ions
What is the ultimate goal of the acceleration process in a mass spectrometer?
To give all ions the same kinetic energy
What is the characteristic of metastable peaks in a mass spectrum?
They are smaller and broader than M1 and M2 peaks
What is the purpose of studying negative ions in mass spectrometry?
Not very useful in structural determinations
What is the process called when molecular ions break down into various fragments due to high excitation?
Fragmentation
What is the type of ion that is formed when a molecule is ionized by removal of one electron?
Molecular ion
What is detected as an electric current in the mass spectrometer?
The flow of electrons
Learn about the principles of mass spectroscopy detection, including the effects of ion mass and charge on deflection, and how ions are detected electrically. Understand the behavior of ions in a mass spectrometer.
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