- Author
-
Mill, R. M.
- Title
- Velocity Modulated Time-of-Flight Mass Spectrometer.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Sponsor
- Navy Dept., Washington, DC
- Report
-
NBS 8064,
August 12, 1963,
34 p.
- Distribution
- AVAILABLE FROM: National Archives, Civilian Records, Room 2800, 8601 Adelphia Road, College Park, MD 20740-6001, Telephone: 301-713-7230
- Contract
- NBS-PROJECT-1002-11-10421
NBS-PROJECT-1002-11-10121
SF150703
- Keywords
-
mass spectrometers
- Abstract
- This paper discusses the possibility of using velocity modulation to improve a time-of-flight mass spectrometer. Calculations show that the resolution can be greatly increased while keeping the unusually high duty cycle. Previously experienced difficulties with harmonics are expected to be significantly reduced by the use of velocity modulation. The resolution has been calculated for three experimental arrangements. The simplest yields a resolution of 650 at 80% duty cycle. If a special "correction wave" generator is added, a resolution of 13,000 at 86% duty cycle seems possible. The third arrangement is a variation of the first which avoids certain grounding difficulties. It is shown that this gives approximately the same resolution and duty cycle as does the first. Equations are derived giving general expressions for resoltuion and duty cycle for the simplest velocity modulated arrangement. Finally, a rough experimental verification of the velocity modulated scheme is given.