Scan types

HILL-SCAN type Highlights Frequency range... 

Designation of scan type Set search for precursor or product ions... 

The Compton profile measurements on Cu and Cu 953AI0047 were performed at ID 15b of the ESRF. Figure 1 shows the setup of the scanning-type Compton spectrometer used. It consists of a Si (311) monochromator (M), a Ge (440) analyzer (A) and a Nal detector (D). The signal of an additional Ge solid state detector (SSD) was used for normalization. ES, CS and DS denote the entrance slit, the collimator slit and the detector slit, respectively. For each sample 10 different directions were measured with approximately 1.5-2 x 103 7 total counts per direction. The incident energy was 57.68 keV for the Cu and 55.95 keV for the Cuo.953Alo.047 measurement. 

Double beam optical spectrometers (scanning type)... 

Fig. J. Simplified diagram of scanning-type electron microscope...

A block diagram of a scanning-type electron microscope is given in Fig. 5. Major elements of the instrument include the electromagnetic lenses that are used to form the electron probe, the scan coils that sweep the beam over the sample, the detector that collects the secondary electrons, and the amplifying means where the secondary electrons are amplified and fed to the cathode ray tube for display. Since the cathode ray tube is scanned in synchronization with the electron beam, the resulting picture corresponds to the area of the sample being examined. 

Use of Mass Analyzer Scan Types Depending on the configuration of the instrument, tandem and hybrid mass spectrometers are capable of far more than simply identifying the mass of a species that emerges from the source. The following is a brief list of relevant terminology and scan types that can be useful in generating additional information to support the identification of an unknown. Note that not all scan types are feasible on all types of instrument. 

Mass Spectrometry Mass spectrometer components, types of mass spectrometers, ionization sources, and scan types are described in Section 1.1.1. 

Superior sensitivity, efficiency, and specificity have made high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS), the predominant analytical technique for characterization and quantitative analysis of metabolites (Kostiainen et al., 2003 Ma et al., 2006 Prakash et al., 2007). Ion trap, triple-quadrupole, and quadmpole time-of-flight (Q-TOF) mass spectrometers are routinely used to profile and characterize metabolites in plasma and excreta (Ma et al., 2006). The combination of scan types and features available on mass spectrometers of different design (product ion, MS", neutral loss, precursor ion scans, accurate mass measurements) allows identification and characterization of putative and unexpected metabolites with or without little prior knowledge of biotransformation pathways of a given dmg molecule. 

Neutral loss Neutral loss monitoring allows the detection of any compound that loses a specified mass during CID. This scan type allowed to detect any glucuronides (neutral loss of 176 Da), sulpho-conjugates (loss of 80 Da) and was helpful to identify molecules that lose a tropic acid moiety (loss of 166 Da) or a tropic acid-derived HCOH group (loss of 30 Da) [51, 52], The occurrence of the latter losses provided helpful hints for the presence of an (partly) unaltered tropic acid moiety in, e.g. atropine. 

Figure 4 illustrates a system of the laser-scanning type. The laser scans the surface and detection occurs because in a defect the intensity of light trans-... 

B = magnetic sector E = electric sector. Six types of magnetic mass spectrometers are displayed. Instruments 4, 5 and 6, with double focusing, are most frequently used. Instrument 4 is dispersive, while 5 and 6 are scanning types. The photographic plate in 4 can be replaced by an array detector for limited mass ranges. Reproduced from Finnigan MAT documentation, with permission. 

Characteristics. Electron-beam exposure experiments were carried ut by using a prototlype HL-600 Hitachi Electron-Beam Lithography System which is a vector scanning type variable-shaped electron-beam machine. The acceleration voltage was 30 kV. Resist films were formed on silicon wafers by spin-coating and prebaked at 80 C for 20 min before exposure. 

For example, some parameters are the same in both applications and present no problem in the data migration project. An example of this parameter is the scan type such as Multiple Reaction Monitoring (MEM) that is present in both applications. Therefore, the migration is relatively straightforward and the acceptance criteria that are set are an exact match. 

In terms of mass spectrometry instrumentation, the currently available instruments such as time-of-flight (TOF) analyzers and hybrid quadrupole-TOF analyzers are able to acquire complete mass spectra at rates compatible with fast CE separations. As CE or ultrafast chromatography replaces conventional, slow HPEC applications, TOF-based mass spectrometers will be needed to replace the less efficient scanning types of instruments such as quadrupoles and ion traps for most high-throughput applications. FTICR mass spectrometry remains unsurpassed in terms of resolution and mass accuracy for both MS and MS-MS applications. However, the throughput of FTICR mass spectrometric... 

Reflections measured +/-F1, + K, + L 20 range 3 -> 60 deg Scan Type omega Scan width ... 

The first scan type to consider is the full scan of all the ions generated in the ion source using no mass selection. This is done by setting both Qj and Q2 to pass all ions (RF-only mode) through to Q3, which is then scanned in the normal way (Figure 7(a)) to generate a spectrum of ions present in the source. 

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