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○ 0(Fe+-CH2) ≤ 342 ± 2 kJ/mol, D○ 0(Co+-CH2) ≤ 331 ± 2 kJ/mol, and D○ 0(Ni+-CH2) ≤ 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.
|Number of pages||5|
|Journal||Journal of Physical Chemistry A|
|Publication status||Published - Mar 16 2000|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry