Multiphoton ionization of CH3 radicals in the gas phase

T. G. DiGiuseppe; Jeffrey W. Hudgens; Ming-Chang Lin

doi:10.1021/j100390a008

Multiphoton ionization of CH₃ radicals in the gas phase

T. G. DiGiuseppe, Jeffrey W. Hudgens^*, Ming-Chang Lin

^*Corresponding author for this work

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

58 Scopus citations

Abstract

The technique of mass-selected multiphoton ionization (MPI) has been applied to the detection of gas-phase methyl radicals. Methyl radicals were produced by pyrolysis of various CH₃ sources in a resistively heated tantalum oven. The output of a Nd:YAG pumped dye laser was focused into the ionization region of a quadrupole mass spectrometer. The mass-selected multiphoton ionization spectrum was obtained by measuring the mass 15 ion signal as a function of dye laser wavelength. Methyl radicals were identified by observing CH₃ Rydberg-state resonances in the MPI spectrum. The three-photon Rydberg states are assigned along with the associated vibronic transitions. The results are discussed in terms of the vibronic structure of the electronically excited Rydberg states. These results indicate the general applicability of multiphoton ionization to the detection of nonfluorescing free radicals.

Original language	English
Pages (from-to)	36-41
Number of pages	6
Journal	Journal of physical chemistry
Volume	86
Issue number	1
DOIs	https://doi.org/10.1021/j100390a008
State	Published - 1982

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title = "Multiphoton ionization of CH3 radicals in the gas phase",

abstract = "The technique of mass-selected multiphoton ionization (MPI) has been applied to the detection of gas-phase methyl radicals. Methyl radicals were produced by pyrolysis of various CH3 sources in a resistively heated tantalum oven. The output of a Nd:YAG pumped dye laser was focused into the ionization region of a quadrupole mass spectrometer. The mass-selected multiphoton ionization spectrum was obtained by measuring the mass 15 ion signal as a function of dye laser wavelength. Methyl radicals were identified by observing CH3 Rydberg-state resonances in the MPI spectrum. The three-photon Rydberg states are assigned along with the associated vibronic transitions. The results are discussed in terms of the vibronic structure of the electronically excited Rydberg states. These results indicate the general applicability of multiphoton ionization to the detection of nonfluorescing free radicals.",

author = "DiGiuseppe, {T. G.} and Hudgens, {Jeffrey W.} and Ming-Chang Lin",

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AU - DiGiuseppe, T. G.

AU - Hudgens, Jeffrey W.

AU - Lin, Ming-Chang

PY - 1982

Y1 - 1982

N2 - The technique of mass-selected multiphoton ionization (MPI) has been applied to the detection of gas-phase methyl radicals. Methyl radicals were produced by pyrolysis of various CH3 sources in a resistively heated tantalum oven. The output of a Nd:YAG pumped dye laser was focused into the ionization region of a quadrupole mass spectrometer. The mass-selected multiphoton ionization spectrum was obtained by measuring the mass 15 ion signal as a function of dye laser wavelength. Methyl radicals were identified by observing CH3 Rydberg-state resonances in the MPI spectrum. The three-photon Rydberg states are assigned along with the associated vibronic transitions. The results are discussed in terms of the vibronic structure of the electronically excited Rydberg states. These results indicate the general applicability of multiphoton ionization to the detection of nonfluorescing free radicals.

AB - The technique of mass-selected multiphoton ionization (MPI) has been applied to the detection of gas-phase methyl radicals. Methyl radicals were produced by pyrolysis of various CH3 sources in a resistively heated tantalum oven. The output of a Nd:YAG pumped dye laser was focused into the ionization region of a quadrupole mass spectrometer. The mass-selected multiphoton ionization spectrum was obtained by measuring the mass 15 ion signal as a function of dye laser wavelength. Methyl radicals were identified by observing CH3 Rydberg-state resonances in the MPI spectrum. The three-photon Rydberg states are assigned along with the associated vibronic transitions. The results are discussed in terms of the vibronic structure of the electronically excited Rydberg states. These results indicate the general applicability of multiphoton ionization to the detection of nonfluorescing free radicals.

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Multiphoton ionization of CH₃ radicals in the gas phase

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