Briefly describe how the time-of-flight mass spectrometer in Figure 22-2 works. What is the benefit of the
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Briefly describe how the time-of-flight mass spectrometer in Figure 22-2 works. What is the benefit of the electrostatic mirror in Figure 22-20?
Figure 22-2
Figure 22-20
Transcribed Image Text:
Grid 1 V₂ = 20 kV to 18 kV Backplate V₂ = 20 kV Sample probe 20 000 V 18 000 V Grid 2 OV Deflector plates Pulsed ultraviolet laser Laser vaporizes samples spot Initial potential Temporary potential after delay time At OVL Backplate Grid 1 20 000 V 18 000 V To high vacuum (10-10 bar) lons with small m/z move faster than ion with large miz -2-m-long field-free drift region Laser pulse Grid 1 potential Af = 0.2-2 μs 10 μs ion Lower ejection grid 1 potential Microchannel plate ion detector -200 V Grid OV Restore grid 1 potential Grid 2 Time Harris/Lucy, Quantitative Chemical Analysis, 10e, © 2020 W. H. Freeman and Company FIGURE 22-2 Schematic diagram of time-of-flight mass spectrometer with matrix-assisted laser desorption/ionization (MALDI) sample introduction and time-delayed ion extraction. -2 kV Gate closed
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The timeofflight TOF mass spectrometer in Figure 222 works by first ionizing the sample to be analyz...View the full answer
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Related Book For
Quantitative Chemical Analysis
ISBN: 9781319164300
10th Edition
Authors: Daniel C. Harris, Charles A. Lucy
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