Radio frequency potential

Mass spectrometer that consists of four parallel rods whose opposing poles are connected. The voltage applied to the rods is a superposition of a static potential and a sinusoidal radio frequency potential. The motion of an ion in the x and dimensions is described by the Mathieu equation whose solutions show that ions in a particular m/z range can be transmitted along the z-axis.1... 

Chemical ionization with an ion trap mass spectrometer is possible at much lower-reagent gas pressures and longer reaction times than typical external sources. A preliminary ionization period is used to establish the reagent gas ion concentration, followed by a relatively long (10s of ms) reaction period at a slightly higher radio frequency potential, during which sample ions are formed and stored. The radio... 

The MD simulations are a flexible and efficient tool the effect of various forces can be studied individually or in conjunction with other forces. In particular, the simulations can be performed with the time-varying radio-frequency potential, or in the pseudopotential approximation and the results compared. For many purposes the simulations need to compute the ion dynamics only for a few tens of milliseconds. Therefore, for not too large ion numbers ( 1000) the time required to obtain useful information using a personal computer is quite reasonable (hours), making the simulations a practical tool. 

Transmission quadrupole to which an oscillating radio frequency potential is applied so as to focus a beam of ions through a colhsion gas with no miz separation. 

A transmission hexapole, octapole or square quadrupole colhsion ceU to which an osciUating radio frequency potential is apphed that is filled with a collision gas at low pressure and used to generate collision induced dissociation (CID) of ions to form a product ion spectrum. The coUision cell has no mass separating capabihties. Axial fields accelerate product ions to leave the colhsion cell for a fast switch of SRM reactions. 

Static and alternating (radio frequency) electric potentials are applied to opposite pairs of rods to give a resultant fluctuating electric field. 

Electrical, electromagnetic, or radio frequency interference causes malfunction of the BPCS and SIS. Potential for common cause failure. 

If the potential applied across the cathode and the anode is constant (dc), conductive materials can be analyzed if the potential is varying at radio frequency (rf), both conductive and non-conductive materials can be analyzed. 

Power supply, x-ray tube, constant-potential, 245, 246 full-wave, 244, 245 half-wave, 244, 245 radio frequency, 149 three-phase, 246 Pre-amplifier, use, 60, 243 Precision, 266... 

The radio-frequency glow-discharge method [30-34] has been the most used method in the study of a-C H films. In this chapter, it is referred to as RFPECVD (radio frequency plasma enhanced chemical vapor deposition). Film deposition by RFPECVD is usually performed in a parallel-plate reactor, as shown in Figure 1. The plasma discharge is established between an RF-powered electrode and the other one, which is maintained at ground potential. The hydrocarbon gas or vapor is fed at a controlled flow to the reactor, which is previously evacuated to background pressures below lO"" Torr. The RF power is fed to the substrate electrode... 

In connection with the square-wave technique, mention can be made of high-frequency polarography, also called radiofrequency polarography and developed by Barker53, in which a sinusoidal radio-frequency cu, (100kHz to 6.4 MHz) square-wave modulated at co2 (225 Hz) is superimposed on to the dc potential ramp as the wave form includes (apart from additional higher... 

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