comstock Incorporated - mini TOF I
| Year of introduction
Mass spectrometer: General
The Comstock miniTOF® I Time-of-Flight Mass Spectrometer is specifically designed for applications requiring rapid on-line mass analysis. The miniTOF® I system is designed to minimize weight, pumping requirements, and instrument dimensions, while retaining excellent sensitivity, specificity, and the extremely rapid response characteristic of time-of-flight mass analysis. Major components such as the vacuum enclosure are made of aluminum to minimize weight. The miniTOF® I system is completely computer-controlled with a modular electronics package designed for easy maintenance. The detector is a rugged electron multiplier with wide dynamic range. Mass resolution and sensitivity are optimized by careful unified design of all aspects of the electron impact ionizer and the flight tube. The miniTOF® I system is operated under Windows compatible computer control.
The miniTOF® I employs a special electron impact ionizer which minimizes space requirements while maximizing sensitivity. Effectively the source region is filled with ions during the flight period after each extraction pulse. Excellent mass resolution is also achieved through careful design of the ion injection optics.
Flight Tube and Ion Optics
The miniTOF® I instrument employs a 40 cm long aluminum flight-tube that is maintained at high potential.
Comstock provides sample introduction systems for introduction of gases or vapors at atmospheric or reduced pressure.
The Comstock miniTOF® I mass spectrometer system use a rugged electron multiplier detector with 50 ohm impedance matched signal output. The detector has a very wide dynamic range of up to eight orders of magnitude. The electron multiplier has a gain of approximately 107, and output pulsewidth of approximately 4 nanoseconds.
Power Supplies and Control
The Model IPU-110 Integrated Power Unit contains all necessary power supplies and control electronics to drive every function of the miniTOF® I system under a Windows platform. The Power Unit is configured for analysis of positive and negative ions. Ionizer, Time-of-Flight Mass Spectrometer, and Detector power supplies are provided, as well as gauge and pump control.
Digitizer or pulse-counting data acquisition operates under Windows OS.
Mounting and Vacuum Chambers
The miniTOF® I Mass Spectrometer is located in a rectangular O-ring sealed aluminum vacuum chamber. The front cover of the vacuum chamber is easily removed to provide rapid and complete service access to the spectrometer, detector, and ionizer. Pumping systems employing turbo pumps & mechanical roughing pump can be supplied.
- Proprietary high resolution electron impact ionization source allows for high resolution in a small spectrometer.
- Wide mass range (1 to 600).
- Rapid acquisition of mass spectral information.
- High sensitivity.
- Simple operation.
- Compatibility with numerous other techniques (gas chromatography, molecular beams).
- Second order spatial focussing ionization source.
- Negative ion mass spectrometry.
- Fast Gas Chromatography (Fast GC)
- Gas Analysis
- IMS (Membrane Introduction Mass Spectrometry)
Mass Spectrometer Specifications
0 to 5,000 amu
Mass Resolution (m/dm)
better than 150 ppm
Flight Tube Length
Ionization Electron Beam Specifications
Electron Energy Resolution