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Title: A quadratic potential time-of-flight mass spectrometer for use with slow positron ionization sources and other large-volume ion sources

Abstract

A time-of-flight spectrometer has been specially designed for measuring the masses of ions produced by low-energy positrons interacting with organic molecules in a Penning trap. To make the flight times insensitive to the starting positions of the ions in the trap, acceleration was done using a potential that varied as the square of the distance of the ion from the detector. The containment of the positrons in the Penning trap for extended time periods effected very long collision paths between the positrons and the molecules. The entire length of the Penning trap source could be sampled. These features produced high sensitivity, enabling the measurement of ionization processes with small cross sections. The spectrometer is useful for mass spectrometry of ions produced by processes other than positron interaction. Both large and small volume sources can be accommodated.

Authors:
; ;  [1]
  1. Oak Ridge National Laboratory, Oak Ridge, Tennessee (USA)
Publication Date:
OSTI Identifier:
5472431
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments; (United States)
Additional Journal Information:
Journal Volume: 62:9; Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; MASS SPECTROMETERS; PENNING ION SOURCES; POSITRON SOURCES; SENSITIVITY; TIME-OF-FLIGHT METHOD; TRAPS; ION SOURCES; MEASURING INSTRUMENTS; PARTICLE SOURCES; RADIATION SOURCES; SPECTROMETERS; 440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments

Citation Formats

Hulett, Jr, L D, Donohue, D L, and Lewis, T A. A quadratic potential time-of-flight mass spectrometer for use with slow positron ionization sources and other large-volume ion sources. United States: N. p., 1991. Web. doi:10.1063/1.1142327.
Hulett, Jr, L D, Donohue, D L, & Lewis, T A. A quadratic potential time-of-flight mass spectrometer for use with slow positron ionization sources and other large-volume ion sources. United States. https://doi.org/10.1063/1.1142327
Hulett, Jr, L D, Donohue, D L, and Lewis, T A. 1991. "A quadratic potential time-of-flight mass spectrometer for use with slow positron ionization sources and other large-volume ion sources". United States. https://doi.org/10.1063/1.1142327.
@article{osti_5472431,
title = {A quadratic potential time-of-flight mass spectrometer for use with slow positron ionization sources and other large-volume ion sources},
author = {Hulett, Jr, L D and Donohue, D L and Lewis, T A},
abstractNote = {A time-of-flight spectrometer has been specially designed for measuring the masses of ions produced by low-energy positrons interacting with organic molecules in a Penning trap. To make the flight times insensitive to the starting positions of the ions in the trap, acceleration was done using a potential that varied as the square of the distance of the ion from the detector. The containment of the positrons in the Penning trap for extended time periods effected very long collision paths between the positrons and the molecules. The entire length of the Penning trap source could be sampled. These features produced high sensitivity, enabling the measurement of ionization processes with small cross sections. The spectrometer is useful for mass spectrometry of ions produced by processes other than positron interaction. Both large and small volume sources can be accommodated.},
doi = {10.1063/1.1142327},
url = {https://www.osti.gov/biblio/5472431}, journal = {Review of Scientific Instruments; (United States)},
issn = {0034-6748},
number = ,
volume = 62:9,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 1991},
month = {Sun Sep 01 00:00:00 EDT 1991}
}