Mass Spectrometry: How Do Different Masses Have Same Velocity?

In summary, the velocity selector in the Bainbridge mass spectrometer uses the principle of deflection rather than velocity to separate different masses. The ions are affected by magnetic fields and move in circular paths, with lighter ions having a larger radius and heavier ions having a smaller radius. This means that the mass difference can be determined by the deflection of the particles, rather than their speed.
  • #1
ananthu
106
1
When different masses are accelerated by the same potential,the lighter mass should move with a greater velocity than that of the heavier one. But, how in the velocity selector in the Bainbridge mass spectrometer, different masses(isotopes) come out with same velocity?
 
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  • #2
The velocity selector in the Bainbridge mass spectrometer follows the principal of deflection rather than the velocity. It explains that the ions are affected by the magnetic fields and then move in circular paths. The lighter ions move in the larger path radius and the heavier ones with a smaller radius. So you should check with the deflection rather that the speed of the particles as all the particles are rotated with the same speed. Hence radius is the only way to get the mass difference.
 

Related to Mass Spectrometry: How Do Different Masses Have Same Velocity?

1. How does mass spectrometry work?

Mass spectrometry works by ionizing a sample and separating its components based on their mass-to-charge ratio. This is achieved by passing the sample through a mass analyzer that uses electric and magnetic fields to deflect the ions. The resulting spectrum shows the relative abundance of each ion, which can be used to determine the composition of the sample.

2. What is the principle behind mass spectrometry?

The principle behind mass spectrometry is based on the fact that ions with different masses will have different velocities in a given electric and magnetic field. This allows for the separation and identification of different components in a sample based on their mass-to-charge ratio.

3. How is the velocity of ions measured in mass spectrometry?

The velocity of ions is measured in mass spectrometry through the use of a detector, which records the time it takes for the ions to reach it after being deflected by the mass analyzer. This time is then used to calculate the velocity of the ions based on the distance between the analyzer and the detector.

4. Why do ions with different masses have the same velocity in mass spectrometry?

In mass spectrometry, ions with different masses are given the same velocity because they are all subjected to the same electric and magnetic fields. This allows for the separation of ions based on their mass-to-charge ratio, as the lighter ions will be deflected more than the heavier ones.

5. What are the applications of mass spectrometry?

Mass spectrometry has a wide range of applications in various fields, including chemistry, biology, forensics, and environmental science. It is commonly used for the identification and quantification of molecules in a sample, as well as for analyzing the structure and composition of complex molecules.

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