Collision Cell Purpose
Collision Cell Purpose - Related Videos
01:04
Types Of Collisions - I
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2023
When two objects come in direct contact with each other, it is called a collision. During a collision, two or more objects exert forces on each other in a relatively short amount of time. A collision can be categorized as either an elastic or inelastic collision. If two or more objects approach each other, collide and then bounce off, moving away from each other with the same relative speed at which they approached each other, the total kinetic energy of the system is said to be conserved. This...
01:19
Types of Collisions - II
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2023
When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
01:22
Purposive Learning
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2024
E. C. Tolman emphasized the purposiveness of behavior — the idea that much of our behavior is goal-directed. For instance, employees who aim for a promotion work diligently to meet their targets. Tolman argued that when classical conditioning and operant conditioning occur, the organism acquires certain expectations. In classical conditioning, a child might fear a dog because they expect it to bite. In operant conditioning, a person might consistently work overtime because they expect a bonus...
10:39
Preparation of Pancreatic Acinar Cells for the Purpose of Calcium Imaging, Cell Injury Measurements, and Adenoviral Infection
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Cited by 8 •
2013
We describe a reproducible method of preparing mouse pancreatic acinar cells from a mouse for the purpose of examining acinar cell calcium signals and cellular injury with physiologically and pathologically relevant stimuli. A method for adenoviral infection of these cells is also provided.
02:43
Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision
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2020
The ideal-gas equation, which is empirical, describes the behavior of gases by establishing relationships between their macroscopic properties. For example, Charles’ law states that volume and temperature are directly related. Gases, therefore, expand when heated at constant pressure. Although gas laws explain how the macroscopic properties change relative to one another, it does not explain the rationale behind it. The kinetic molecular theory is a microscopic model that helps understand what...
FAQs
Ion–gas collisions can reduce the kinetic energy of transmitted ions or provide enough energy for collisionally activated dissociation. The instrument design and operating conditions determine which outcome dominates. Energy reduction can support interference management, whereas induced fragmentation produces product ions that carry structural information. Thus, collision behavior directly affects which ions ultimately contribute to the measurement.
Helium and argon serve as inert collision gases through which ions travel before detection. Their presence enables controlled ion–gas interactions without serving as the chemical analyte itself. By promoting energy loss or collisionally activated dissociation, the gas environment helps the instrument regulate transmission, generate product ions, or remove unwanted polyatomic interferences, depending on the mass-spectrometric application.
Operating conditions determine whether collisions primarily lower ion kinetic energy or induce fragmentation. That distinction changes the balance among sensitivity, selectivity, mass resolution, and measurement accuracy. Conditions that favor informative product-ion formation are valuable for molecular structural analysis, while conditions that support interference removal are important for elemental measurements. The appropriate setting therefore depends on the analytical objective.
In tandem mass spectrometry, the collision cell is used to generate product ions through collisionally activated dissociation, making molecular structure easier to analyze. In inductively coupled plasma mass spectrometry, it can reduce polyatomic interferences before detection, improving the reliability of elemental measurements. The same general collision principle therefore supports different analytical goals: structural information in one case and interference control in the other.
Ions enter the gas-filled region and undergo collisions under instrument conditions selected to promote fragmentation. Collisionally activated dissociation produces product ions from precursor ions, and those products provide informative patterns for structural analysis. Researchers can therefore use the resulting ion signals to obtain more chemical information than a measurement based only on the original transmitted ions.
Collision-cell operation is especially useful in inductively coupled plasma mass spectrometry when polyatomic interferences could compromise elemental measurements. Collisions with an inert gas reduce the impact of those unwanted species before ions reach the detector. This interference-removal role can improve measurement accuracy and selectivity, making the approach relevant when distinguishing analytical ions from overlapping polyatomic signals is necessary.