What is an ion mobility spectrometer IMS used for?
Table of Contents
What is an ion mobility spectrometer IMS used for?
Ion mobility spectrometry (IMS) is used as an online metabolite detection tool in human breath metabolomics research and related applications. IMS technology represents a user-friendly and fast platform that can measure hundreds of volatile gas-phase metabolites present in human breath.
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 IMS in chemistry?
Ion mobility spectrometry (IMS) is an analytical technique used to separate and identify ionized molecules in the gas phase based on their mobility in a carrier buffer gas.
What is a Plasmagram?
What is a ‘plasmagram’? The Radio Plasma Imager will produce, as its standard data product, a two- dimensional snapshot of the plasma in the magnetosphere called a plasmagram. These will be updated every 5 minutes during the 2 year mission.
What is a drift gas?
The drift gases chosen were helium, argon, nitrogen, and carbon dioxide. These drift gases provide a range of polarizabilities and molecular weights.
What does ion mobility depend on?
The larger the ion is, the longer the drift time, which forms the basis of ion separation. Since mobility is proportional to the number of collisions, the mobility of the ion is proportional to the gas density (pressure) of the buffer gas.
What is the unit of ionic mobility?
The ionic mobility is described as the speed achieved by an ion moving through a gas under a unit electric field. It is denoted by (μ). The unit of ionic mobility is m2s−1 volt−1.
What is ionic mobility formula?
Ionic mobility formula For an applied potential (V), let the current I flow through the cell. Since the solution obeys Ohm law, I = V/R = λV. The solution contains one g equivalent electrolyte and the conductance (1/R) = λ.
What does ionic mobility depends on?
The mobility depends not only upon the nature of the ion and gas but also upon the density of the gas, for the latter controls the mean free path of the ion. In atmospheric electricity, the mobilities of small and large ions weight their relative importance in atmospheric conduction.
What is mobility formula?
Mobility μ is defined as the magnitude of drift velocity per unit electric field. μ=E∣vd∣. Its SI unit is m2/Vs.
How do you calculate mobility of an electron?
We can show electron mobility mathematically by the equation, μ=VdE . The SI unit of electron mobility under the influence of an external electric field is shown as, m2V−1s−1 .
How is mobility calculated?
The SI unit of velocity is m/s, and the SI unit of electric field is V/m. Therefore the SI unit of mobility is (m/s)/(V/m) = m2/(V⋅s).
What is ionic mobility?
Ion mobility (IM) is a gas-phase technique allowing the separation of ions based on their mobility through an inert gas (typically helium or nitrogen) under the influence of an electric field [3–5,6•].
How do you increase ionic mobility?
High temperature generally increases the feed conductivity, facilitates ionic mobilities, reduces Ohmic losses, and hence increases the power density.
What is meant by mobility of gases?
(Abstract). The molecular mobility of gases is here considered in referenee. chiefly to the passage of gases, under pressure, through a thin porotus. plate or septum, and to the partial separation of mixed gases which. can be effected, as will be shown, by such means.
What is mobility and its units?
Mobility is defined as the drift velocity acquired per unit electric field. μ=meτ (or) μ=EVa. Its unit is m2V−1S−1.
