Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 104, Issue 10, Pages 2020-2024Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp993652m
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Photofragment spectra of jet-cooled MCH2+ (M = Fe, Co, Ni) have been measured. Our investigation of NiCH2+ represents the first reported spectroscopic study of this molecule. A spectroscopic threshold is observed for each of the three systems. In addition to imposing strict upper limits on the M+-CH2 bond strengths, these results further the discussion concerning the interpretation of spectroscopic thresholds as thermodynamic limits. The measured upper limits are: D degrees(0)(Fe+-CH2) less than or equal to 342 +/- 2 kJ/mol, D degrees(0)(Co+-CH2) less than or equal to 331 +/- 2 kJ/ mel, and D degrees(0)(Ni+-CH2) less than or equal to 295 +/- 5 kJ/mol. Three distinct, 2-nm-wide peaks are observed in the photofragment spectrum of CoCH2+, but the spectra lack sharp structure above threshold.
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