CRNT PRB ANLYT CHEM
CRNT PRB ANLYT CHEM CHEM 520
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This 16 page Class Notes was uploaded by Carmela Kilback on Wednesday September 9, 2015. The Class Notes belongs to CHEM 520 at University of Washington taught by Staff in Fall. Since its upload, it has received 56 views. For similar materials see /class/192582/chem-520-university-of-washington in Chemistry at University of Washington.
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Date Created: 09/09/15
quotE6 339 o 1133 I 1 TimeofFlight Mass Spectrometer elecTron beam l f l D 1quot 9V V i4 quot l 9 390 0 cw TimeOfFlight Mass Spectrometer ttotstn V2 ts 1 T 2U i Tom t D m D D v mm an s ion source path length D drift region path length U acceleration voltage To neutral kinetic energy m ion mass z ion charge 70 32ns 60 50 6 340 O E quot39 30 20 was 29 12 10 0 0 100 200 300 400 500 600 700 800 900 1000 mz TimeofFlight Medium resolution 39 202 200 199 201 198 204 Higluzesolution 856 F 22 t 5 NTNY 305 I 2 r2 soo 867 C F L00 Ali ALZSns 7 79317 7939L 794 41 79L85 time in psec Ion Refocusing Delayed Extraction hv j Vmin 6 Vmax Ljgt Q distribution of velocities C lIIlllllllIlllllllll lllllllllllli Uacc V Vacc Vini x gt I 4quot e acc acc 39 Xmin V39 Xmax X V C Xmm met max max ZZQU V l39 aCC 1711 m 1000 Da 166 x10 2439kg d50m 005vm Um 10 000v 711 1454 Quadrupole Mass Filter U V cos cot UVcoscot UVcosoot AU V cos wt 9 Fig 21 Equipotential lines for quadrupole field where 1513 y Fig 22 The electrode structure reun to generate the shown in Fig 21 These are the ideal quadrupole mass filter electrodes having hyperbolic crosssections plea elodmp 42391 091 51909 Q7l30d o Quadrupole Mass Filter Basic Formulas and Operations P Dawson Mass Spectrom Rev 1986 5 137 Ideal hyperbolicrod filter Potential CD I I 92x2 y2 27quot0 Applied potential DO U Vcoscot U dc voltage V rf amplitude a a 4eU q q 26V r0 inscribed radius 6 y mrozwz x y mmsz Nonideal round rod filter Rrod 11486r0 Scan Function U 016784V U0 Constant Am determined by U0 6 Mass range max 2 fHertz r0m f 7 0 Mass resolution it 15 5958 VU at apex Am FWHM theoretical Am 1 5958 V 2 Mass resolution quotL z S length practical Am 35 frequency X v e10 city m L2 V 1 m N For 8 20 and linear scan E anmax ELM 5800 ICC b4 33 qu Figure 22 Mathieu stability diagram in one dimension The characteristic curves aohab2 divide the plane into regions of stability and instability The menorder curves are symmetric about the 1 axis but the oddorder curves are not The diagram itself however is symmetric about the a axis aU unstable stable stable unstable qquot I39igntc 2 Graphical representation of stable solutions of the Mathieu equation plotted in M space 46 THEORY OF QUADRUPOLE MASS SPECTROMETRY x stable Figure 26 Several it for the twdimcmionalqmdnpolc eld a diagams in the they ditoction Qu mm 21 The Mathias stability diagram in m dimensio x and y Regions ofsimullam omoverlaparclabeledABCandD Quadrupole Mass Filter 8U arzc2 mz I aq parameters 4V a ac eld angular frequency qrzm2 2r pole distance 0 25 I 39 l l I I l r r 020 quotI a ms Stable 0l0 oscnllohon 005 I Muw39altv ww arr uf wn My ova v1 z39vr39 50 THEORY OF OUADRUPOLE MASS SEEC I ROMETRY R 100 Jn R s 10 ml 2 i xy motion unstobe y z mo on unstable stability 6 0 region R J a rd q0 o 391 h 3 3 3 b 5 393 3quot 10 I q l lgun 210 Expanded region of the stabilin diagram The mass scan lo resolutions of 1 10 and tomm m2 and m ropresem the mass Reproduced by permission of Elsevier Science Publishers EV III Elmmime Journal of Mass Spectmmmy and Ion quotMics Volume 33 um m m 48 THEORY OF QUADRUPOLE MASS SPECTROMETRY M3 opercting U inc Figure 29 Smbilily diagrams Iransformcd lo UV space Fluid Mechanics Terminologies l Reynolds NumberRe ULp Inertia force Re u Viscous force Uvelocity Ltube Width pdensityuviscosity 2 Laminar Vs Turbulent Flow Laminar Viscous force dominate Relt2100 in tube Turbulent inertia force dominate but competes with Viscous force Regt2100 in tube Inviscid Viscous force negligible Re gtgt 2100 Fluid Mechanics Terminologies 3 Steady Flow Velocity of uid in space is i Xyzt at position Xyz at time t Steady ow a E The velocity eld of uid 2 at each point in space is constant in time 0 Not the same as mean velocity
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