Fresh lifehacks

What do you mean by ion mobility?

What do you mean by ion mobility?

Ion mobility refers to the differential speeds at which ions migrate through a gas under the influence of an electric field. In addition to the effect of the ion’s mass and charge, its mobility is also influenced by shape making it possible, in some cases, to separate isomers.

How does ion mobility work?

In an ion mobility spectrometer, organic molecules are ionized and driven by an electric field against a counterflow of neutral drift gas. In their way to the detector, the ions collide multiple times with the drift gas, which reduce their speed. After each collision, ions are accelerated again by the imposed field.

What is ion mobility spectrometer for?

Ion mobility spectrometry (IMS) is widely used for national security and law enforcement, placed at key transportation checkpoints such as airports and border crossings for the trace detection of drugs and explosives.

What is mobility electrophoresis?

The electrophoretic mobility, μ (m2/Vs), is the observed electrophoretic velocity, v (m/s), divided by electric field strength, E (V/m): \mu =\frac{v}{E} The electrophoretic velocity is the distance of migration divided by time, also called velocity of migration.

How ionic mobility is related to ionic conductance?

The ionic mobility (μ) is defined as the velocity attained by an ion moving through a gas under unit electric field. Ionic mobility or Ionic conductance is the conductivity of a solution containing 1 g ion, at infinite dilution, when two sufficiently large electrodes are placed 1 cm apart.

How is the mobility of an ion related to the field?

As the field is held constant, the velocity, and therefore the mobility, of an ion is dependent upon its mass, charge, size, and shape as it traverses the drift tube and collides with the buffer gas molecules. This is demonstrated by the following equation:

How is ion mobility spectrometry ( IMS ) used to measure ion mobility?

In its simplest form, an IMS system measures how long a given ion takes to traverse a given length in a uniform electric field through a given atmosphere.

How does a drift tube ion mobility spectrometer work?

A drift tube ion mobility spectrometer. In its simplest form, an IMS system measures how long a given ion takes to traverse a given length in a uniform electric field through a given atmosphere.

What does the Yost research group do for ion mobility?

One of the primary focuses of the Yost Research Group is developing novel instrumentation and methodologies for High-Field Asymmetric Waveform Ion Mobility Spectrometry (FAIMS). FAIMS can be performed on a standalone device, or, more prominently, coupled to a mass spectrometer (MS).

Share this post