Resonance enhanced multiphoton ionization/time-of-flight measurements of the velocity and internal energy content of thermal and photochemical methyl radical sources

D. Howard Fairbrother, K. A. Briggman, K. A. Dickens, Peter C Stair, Eric Weitz

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A single-stage time-of-flight mass spectrometer used in conjunction with resonance enhanced multiphoton ionization has been employed to study the dynamics of surface photodissociation processes as well as methyl radicals produced from a continuous source. By utilizing ion rather than neutral flight times, species that have an impressed velocity along the detection axis can be readily distinguished from species that exhibit an isotropic velocity distribution. This allows for experimental discrimination between photofragments produced from adsorbate photolysis and those produced as a result of probe laser photolysis of gas-phase species photodesorbed from the surface. For species generated in continuous sources, such as methyl radicals produced from azomethane pyrolysis, the same approach permits an unambiguous determination of the total-energy content, despite the presence of additional radicals within the ionizing volume that have scattered from the chamber walls.

Original languageEnglish
Pages (from-to)2031-2036
Number of pages6
JournalReview of Scientific Instruments
Volume68
Issue number5
Publication statusPublished - May 1997

Fingerprint

Photolysis
internal energy
Ionization
Photodissociation
ionization
photolysis
Mass spectrometers
Adsorbates
Velocity distribution
flight time
Pyrolysis
photodissociation
mass spectrometers
pyrolysis
discrimination
energy
Lasers
Ions
velocity distribution
chambers

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Instrumentation

Cite this

Resonance enhanced multiphoton ionization/time-of-flight measurements of the velocity and internal energy content of thermal and photochemical methyl radical sources. / Fairbrother, D. Howard; Briggman, K. A.; Dickens, K. A.; Stair, Peter C; Weitz, Eric.

In: Review of Scientific Instruments, Vol. 68, No. 5, 05.1997, p. 2031-2036.

Research output: Contribution to journalArticle

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