Effect of damping force on CIT and QIT ion traps supplied with a periodic impulse voltage form

Kiai, S. M. Sadat; Chaharborj, Sarkhosh Seddighi; Bakar, Mohd Rizam Abu; Fudziah, I.

doi:10.1039/c1ja10170f

Cited by 12 publications

(8 citation statements)

References 35 publications

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“…If the force is also proportional to the velocity, as a simple mechanical viscous damper, the force F may be related to the velocity v by F ¼ Àcv, where c is the viscous damping coefficient, given in units of Newton-seconds per meter. [27][28][29] According to Seddighi Chaharborj et al 30 and Kiai et al, 31 the equations for ion motion in the zÀ and rÀdirections for a singly charged positive ion using the effect of a damping force on the confinement of ions in a QIT can be defined as follows,…”

Section: Effect Of Damping Forces On the Confinement Of Ionsmentioning

confidence: 99%

Applications of the fractional calculus to study the physical theory of ion motion in a quadrupole ion trap

Chaharborj

Moameni

2017

Eur J Mass Spectrom (Chichester)

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In this article, fractional calculus has been applied to study the motion of ions in a three-dimensional radio frequency quadrupole ion trap; we have called this arrangement a fractional quadrupole ion trap. The main purpose of the article is to show that by controlling the fractional parameter of a trapped ion, one can gain a more efficient mass separation. In what follows, we will see that with decreasing the fractional parameter, we can achieve a smaller first stability region. Note that a small stability diagram will result in a good and acceptable mass separation. Various methods can be proposed to obtain a desired ion acceleration with a sufficient accuracy for good mass separation, which is similar to the one obtained by a fractional ion trap. Some of these methods are using the effects of a damping force, a magnetic field or both on the confinement of particles in the quadrupole ion trap. The first stability regions are plotted for all of the aforementioned methods, and simulation results are provided to compare them with those for the fractional case.

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Section: Effect Of Damping Forces On the Confinement Of Ionsmentioning

confidence: 99%

Applications of the fractional calculus to study the physical theory of ion motion in a quadrupole ion trap

Chaharborj

Moameni

2017

Eur J Mass Spectrom (Chichester)

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“…The resolution of the quadrupole mass filter with hyperbolic cross-section rods, in general, is a function of the mechanical accuracy of the hyperboloid of the QMF, Dr 0 , and the stability performances of the electronics device such as variations in voltage amplitude DV and the rf frequency DW. 21 Table 2shows the values of q r (r = x or y) and V max for the QMF in the first stability region when a = 0 and using the new potentials. The values of V max have been obtained for 23 Na + with W = 2P × 0.5 × 10 6 rad s -1 , U = U dc = 0 V, r 0 = 0.783 cm in the first stability region when a = 0.…”

Section: Stability Regionsmentioning

confidence: 99%

“…16,17 To apply various objectives, various geometries of the mass spectrometer have been suggested. [18][19][20][21][22][23][24] The ideal quadrupole field is produced from four electrodes with hyperbolic cross sections, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Study of Quadrupole Mass Filter Supplied with a New Impulsional Potential

Chaharborj

Kiai

Ismail

et al. 2012

Eur J Mass Spectrom (Chichester)

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The paper reports on some theoretical studies concerning the impulsional mode of a quadrupole mass filter (QMF) supplied with a new periodic impulsional radio frequency voltagein the form of V(ac)cos(Ωt)⌊1=kcos(1/3Ωt/1-√kcos(2Ωt⌋ with 0 ≤k < 1 (⌊.⌋ means floor function) and eventually compares it to the classical sinusoidal case, k = 0. The physical properties of the confined ions in the r and z directions are illustrated and the fractional mass resolutions m/Δm of the confined ions in the first stability regions of both potential were analyzed for hydrogen isotopes and presented.

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“…The resolution of a cylindrical ion trap mass spectrometry [22] in general, is a function of the mechanical accuracy of the hyperboloid of the CIT ∆r 1 , and the stability performances of the electronics device such as, variations in voltage amplitude ∆V, the rf frequency ∆Ω [22,28], which tell us, how accurate is the form of the voltage signal. Here we study the resolution of a cylindrical ion trap with RKM5 and three-point one block methods.…”

Section: The Effect Of Three-point One Block Methods On the Mass Resolmentioning

confidence: 99%

“…The equation of the motions [8,18,19,[22][23][24] of the ion of mass m and charge e can be written as …”

Section: Electric Field Inside Cylindrical Ion Trapmentioning

confidence: 99%

Mass Resolution Study in the Cylindrical Ion Trap by Using Three-Point One Block Method

Chaharborj¹,

Gheisari²

2017

Mass Spectrom Purif Tech

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Motion equations in cylindrical ion trap (CIT) coupled in u and v (respective r and z), and thus, can only be treated as a rough approximation. Hence, studies on cylindrical ion trap (CIT) equations are more complicated and involved. Therefore, a three point one block method (3POBM) of Adams Moulton type is presented to study a cylindrical ion trap (CIT) motion equations. The advantage of the three point one block method (3POBM) is to estimate the approximate solutions directly at three points simultaneously. Numerical results from three point one block method (3POBM) will compare with fifth order Runge-Kutta method (RKM5). The proposed three points one block method has a potential application to solve complicated linear and nonlinear equations of the charge particle confinement in the cylindrical field especially in fine tuning accelerators, and generally speaking, in physics of high energy. The physical properties of the confined ions in the r and z axises are illustrated and the fractional mass resolutions m/∆m of the confined ions in the first stability region was analyzed by the fifth order Runge-Kutta method (RKM5) and three points one block method (3POBM).

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Effect of damping force on CIT and QIT ion traps supplied with a periodic impulse voltage form

Cited by 12 publications

References 35 publications

Applications of the fractional calculus to study the physical theory of ion motion in a quadrupole ion trap

Applications of the fractional calculus to study the physical theory of ion motion in a quadrupole ion trap

Study of Quadrupole Mass Filter Supplied with a New Impulsional Potential

Mass Resolution Study in the Cylindrical Ion Trap by Using Three-Point One Block Method

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