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Eur. J. Mass Spectrom.
5, 235–241 (1999)
DOI:
10.1255/ejms.279 |
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Collision-induced dissociation of Cr2(CO)y+ (y = 4–7) |
|
Eugene M. Markina and Ko-
ichi Sugawara*
National Institute for Advanced Interdisciplinary Research, National Institute of Materials and Chemical Research, Higashi 1-1-4, Tsukuba
305-8562, Japan. E-mail: sugawara@nair.go.jp. |
| ABSTRACT: |
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Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry has been applied to the study of energy-resolved
collision-induced dissociation of Cr2(CO)+ (y = 4–7) prepared during the clustering reactions initiated by the dissociative
ionization of Cr(CO)6. Mass-selected precursor ions were activated by translational energy-controlled collisions with helium. Threshold curves for the dissociation
products were analyzed using model functions convoluted with a Doppler broadening distribution function. For one CO ligand loss from
Cr2(CO)4+, Cr2(CO)5+ and Cr2(CO)7+, the
threshold values were determined to be 1.26 ± 0.11, 1.92 ± 0.16 and 1.35 ± 0.12 eV, respectively, at 298 K. In the case of
Cr2(CO)6+, the lowest energy channel was chromium ion elimination with a threshold of 1.47 ± 0.12 eV. |
|
Keywords:
FT-ICR, collision-
induced dissociation, chromium carbonyl clusters, dissociation process. |
