RSI Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter UniPHY Group iResearch App Facebook

Review of Scientific Instruments / Volume 78 / Issue 8 / CHEMISTRY

Rev. Sci. Instrum. 78, 084102 (2007); http://dx.doi.org/10.1063/1.2776012 (7 pages)

Data acquisition schemes for continuous two-particle time-of-flight coincidence experiments

Andras Bodi1, Bálint Sztáray2, Tomas Baer3, Melanie Johnson1, and Thomas Gerber1

1Paul Scherrer Institut, Villigen 5232, Switzerland
2Eötvös Loránd University, Budapest 1117, Hungary and Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
3Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599

View MapView Map

(Received 29 May 2007; accepted 4 August 2007; published online 23 August 2007)

Three data acquisition schemes for two-particle coincidence experiments with a continuous source are discussed. The single-start/single-stop technique, implemented with a time-to-pulse-height converter, results in a complicated spectrum and breaks down severely at high count rates. The single-start/multiple-stop setup, based on a time-to-digital converter and the first choice in today’s similar coincidence experiments, performs significantly better at high count rates, but its performance is still hampered if the time-of-flight range is large, and the false coincidence background is variable if the event frequency and the collection efficiency of the starts are both high. A straightforward, multistart/multistop setup is proposed for coincidence experiments. By collecting all detector data, it ensures the highest signal-to-noise ratio, constant background, and fast data acquisition and can now be easily constructed with commercially available time-to-digital converters. Analytical and numerically evaluated formulas are derived to characterize the performance of each setup in a variety of environments. Computer simulated spectra are presented to illustrate the analytically predicted features of the various raw time-of-flight distributions obtained with each technique.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. GENERAL PRINCIPLES
  3. STATISTICAL UNCERTAINTY IN THE TOF SPECTRA
  4. SIMULATIONS
  5. DISCUSSION

RELATED DATABASES

To view database links for this article, you need to log in.

KEYWORDS and PACS

Keywords

data acquisition, photoelectron spectroscopy, time of flight spectroscopy

PACS

  • 07.57.-c

    Infrared, submillimeter wave, microwave and radiowave instruments and equipment

  • 07.60.-j

    Optical instruments and equipment

  • 07.81.+a

    Electron and ion spectrometers

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2776012

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to citing articles, you need to log in.


Figures (5)

Access to article objects (figures, tables, multimedia) requires a subscription; log in to view available files.
(Access to supplementary files, where available, is free for this journal.)



Close

Google Calendar

ADVERTISEMENT

Your Recent History Recent History Help

Recently Viewed

  1. Data acquisition schemes for continuous two-particle time-of-flight coincidence experiments
  2. Invited Review Article: A review of techniques for attaching micro- and nanoparticles to a probe’s tip for surface force and near-field optical measurements
  3. Transient two-dimensional IR spectrometer for probing nanosecond temperature-jump kinetics
  4. Invited Article: Simultaneous mapping of temperature and stress in microdevices using micro-Raman spectroscopy
  5. Design and performance of a curved-crystal x-ray emission spectrometer
Go to AIP Home
Copyright © American Institute of Physics
close