The phrase "are accelerated by a" is correct and usable in written English.
It can be used in contexts where you are describing a process or phenomenon that is being sped up or enhanced by a specific factor or agent.
Example: "The chemical reactions are accelerated by a catalyst, leading to faster production rates."
Alternatives: "are sped up by a" or "are enhanced by a".
Some stock plans and bonus programs for Kmart employees are accelerated by a change in control as well, the plan notes.
These are called anomalous cosmic rays and, because they are accelerated by a different mechanism, their intensity changes relative to the galactic cosmic rays.
In a mass spectrometer the material under investigation is in the form of a gas of ionized particles that are accelerated by a fixed electric field.
Photoelectrons from the cathode are accelerated by a potential difference of 20 30 kV and deposit their kinetic energy in the scintillator (or Phosphor).
Pellets are accelerated by a short pulse of pressurized helium propellant gas to velocities in the range of 100 250 m/s.
Photo-electrons are produced in a semi-transparent multi-alkali photo-cathode (S20) and are accelerated by a voltage of 20 kV onto a pixelated silicon anode.
Their velocity decreases drastically when they are accelerated by an externally applied magnetic force within a microfluidic channel.
The gas is then ionized by a radio-frequency power source, and the ions are accelerated by an electric field toward the metal surface.
A cyclotron, for example, is a device used for scientific research in which subatomic charged particles are accelerated by an alternating electric field in a constant magnetic field.
The gaseous ionized clusters are accelerated by an electric field and then analyzed according to their masses (see mass spectrometry); these results immediately reveal the number of atoms or molecules in the cluster.
Then, the detached ions are accelerated by an electric field emanating from a grid toward a target.
