A novel method to determine collisional energy transfer efficiency by Fourier transform ion cyclotron resonance mass spectrometry

Ron M A Heeren, K. Vékey

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A novel method is presented here to determine accurately the conversion efficiency in low energy collision processes. Using blackbody infrared radiation, the initial thermal energy of a selected molecular ion is both well defined and well known. Collisional activation is subsequently used to probe the additional energy needed to reach a particular final internal energy distribution, characterized by a given fragmentation rate (e.g. 50% of the molecular ion being decomposed). The method is discussed for collision induced dissociation under multiple collision conditions using resonant excitation in a Fourier transform ion cyclotron resonance ion trap. By variation of the thermal energy content the collisional energy necessary to obtain 50% fragmentation rate is also changed. Knowing this change, the collisional to internal energy transfer can accurately be determined. In the case of Leucine-Enkephaline using r collision gas it was shown that 4.4% of the laboratory frame collision energy is converted into internal energy in the resonant excitation collision cascade. In individual collisions 9.6% of the centre of mass collision energy is converted into internal energy. Note, that this value is accurately determined as an average for collisions in the 4-6 eV centre of mass collision energy range, but is approximately the same in the 0-4 eV range as well.

Original languageEnglish
Pages (from-to)1175-1181
Number of pages7
JournalRapid Communications in Mass Spectrometry
Volume12
Issue number17
DOIs
Publication statusPublished - 1998

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Cyclotron resonance
Energy transfer
Mass spectrometry
Fourier transforms
Ions
Thermal energy
Leucine
Conversion efficiency
Gases
Chemical activation
Infrared radiation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

Cite this

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abstract = "A novel method is presented here to determine accurately the conversion efficiency in low energy collision processes. Using blackbody infrared radiation, the initial thermal energy of a selected molecular ion is both well defined and well known. Collisional activation is subsequently used to probe the additional energy needed to reach a particular final internal energy distribution, characterized by a given fragmentation rate (e.g. 50{\%} of the molecular ion being decomposed). The method is discussed for collision induced dissociation under multiple collision conditions using resonant excitation in a Fourier transform ion cyclotron resonance ion trap. By variation of the thermal energy content the collisional energy necessary to obtain 50{\%} fragmentation rate is also changed. Knowing this change, the collisional to internal energy transfer can accurately be determined. In the case of Leucine-Enkephaline using r collision gas it was shown that 4.4{\%} of the laboratory frame collision energy is converted into internal energy in the resonant excitation collision cascade. In individual collisions 9.6{\%} of the centre of mass collision energy is converted into internal energy. Note, that this value is accurately determined as an average for collisions in the 4-6 eV centre of mass collision energy range, but is approximately the same in the 0-4 eV range as well.",
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AB - A novel method is presented here to determine accurately the conversion efficiency in low energy collision processes. Using blackbody infrared radiation, the initial thermal energy of a selected molecular ion is both well defined and well known. Collisional activation is subsequently used to probe the additional energy needed to reach a particular final internal energy distribution, characterized by a given fragmentation rate (e.g. 50% of the molecular ion being decomposed). The method is discussed for collision induced dissociation under multiple collision conditions using resonant excitation in a Fourier transform ion cyclotron resonance ion trap. By variation of the thermal energy content the collisional energy necessary to obtain 50% fragmentation rate is also changed. Knowing this change, the collisional to internal energy transfer can accurately be determined. In the case of Leucine-Enkephaline using r collision gas it was shown that 4.4% of the laboratory frame collision energy is converted into internal energy in the resonant excitation collision cascade. In individual collisions 9.6% of the centre of mass collision energy is converted into internal energy. Note, that this value is accurately determined as an average for collisions in the 4-6 eV centre of mass collision energy range, but is approximately the same in the 0-4 eV range as well.

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