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The cone voltage is much lower than the capillary (a few ten of volts), and is used to remove the solvent molecules attached to the ions, by collision with the gas used to assist the spray.
Why is the cone voltage on mass spectrometers positive for positive ions? I would have thought that the positive ions would be attracted to the cone by a negative potential. Is the voltage, perhaps,
However, the equation for the apex point shows that at a specific voltage, called the Taylor Cone voltage, the force balance becomes independent of the curvature radius; hence, the radius can theoretically become zero, which is the moment when the Taylor Cone forms and the electrospray is initiated (10).
The cone voltage provides a means to reduce the incidence of ion clusters (declustering potential), which will reduce the complexity of resulting spectra and reduce spectral noise.
Then, behind the curtain plate there is the cone voltage—or declustering potential (DP). This is the voltage applied to the opening where the ions enter that helps to prevent the ions from clustering together.
ANSWER: No. Because the cone voltage is ramped for the duration of the scan, there is no way to pull out which cone voltage gave the best result.
Agilent has undertaken an in-depth study on the performance of its genuine Agilent cones for the Agilent 7900 ICP-MS using the x-lens configuration (these being the nickel sampler and the nickel skimmer cones), and to benchmark and compare with other cone manufacturers.
Cone-voltage fragmentation Fragmentation of ions, commonly produced by APCl or electrospray ionization, effected by the application of a voltage within the source of the mass spectrometer. [Pg.304] Fragmentor voltage Another term for cone-voltage fragmentation. [Pg.306]
It was found that cone voltage was the most critical parameter contributing to in-source fragmentation of both O - and N -glucuronides, whereas both the desolvation temperature and the source temperature had little effect.
Shimadzu LCMS 2020 Cone Voltage Discussions about GC-MS, LC-MS, LC-FTIR, and other "coupled" analytical techniques.