Time-of-Flight Mass Spectrometry

The Detector System	The Vacuum Chamber

Information on Time-of-Flight Mass Spectrometry

In Gas Phase	On Silicon Surface or Matrix
� Our mass spectroscopy system will analyze the positive ions through the concept of Time of Flight (TOF). � TOF is the idea that the positive ions created through the interaction with the silicon surface, will be accelerated towards the detector by an initial electrical field. � Once they traverse the initial field they will travel through a field free region.

� The field free region is composed of electrical grids held at ground.

�The positive ions moving through this field free region will separate according to their mass to charge ratios.

�These ions then will reach the detector and will be picked up as signal by the oscilloscope through the use of a capacitor to decouple high voltage.

Machining Parts

Voltage Divider Used

Link to Presentation on Mass Spectrometer Design and Construction

\\Pchem_bomb\pchem\MASSSPEC\MASSSPECTRO_FINAL.ppt

Built By: Kelly Devine

Spring 2001