Collision Cross Section

If you use these values in your research please cite the appropriate publication s for the value s.

Collision cross section. A comprehensive database of collision cross section ccs measurements taken from a variety of sources see references below and a high quality and high throughput ccs prediction model trained with this database using machine learning. For example the rutherford cross section is a measure of probability that an alpha particle will be deflected by a given angle during a collision with an atomic nucleus cross section is typically denoted σ and is expressed in terms of the transverse area that the. In the image below the area within the black circle is molecule a s collisional cross section.

The unified compendium is a repository of 3800 experimentally acquired ccs values obtained from traceable molecular standards and measured with drift tube mass spectrometers. σ πr2 πd2 collision cross section in the direction of motion one will obtain an imaginary collision cylinder collision volume. The original reference for each value is included in the rightmost column of each table.

Launch the interactive unified ccs compendium here. Collision cross sections in both helium and nitrogen gases were measured directly using a drift cell with rf ion confinement inserted within a quadrupole ion mobility time of flight hybrid mass spectrometer waters synapt hdms manchester u k. A unified ccs compendium is an online interactive tool that utilizes ion mobility collision cross sections to annotate biochemical molecules.

That area can change depending on the size of the two particles involved. Collision cross section database and prediction. Collision cross sections for ions of many small molecules peptides denatured proteins native like proteins and native like protein complexes are reported below.

The collisional cross section is defined as the area around a particle in which the center of another particle must be in order for a collision to occur. The ccs measurements were made on a variety of instruments both drift tube and traveling wave. Online collision cross section compendium.