State correlations in the unimolecular dissociation of ketene

Matthew L. Costen, Hideki Katayanagi, Gregory E. Hall

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Doppler-broadened absorption spectra of selected rotational levels of singlet CH2 fragments from the 308-nm photolysis of ketene have been observed by frequency-modulated transient absorption spectroscopy in a slit jet expansion. Nascent Doppler profiles of CH2 transitions have been analyzed to yield the internal energy distributions of coincident CO fragments at a total energy 2333 cm-1 above the singlet dissociation threshold. The vibrational branching ratio of CO (v = 1):(v = 0) is determined in coincidence with selected rotational levels of CH2. The coincident rotational distributions of CO (v = 0) are also estimated and found to differ from simple statistical predictions, revealing a relative deficiency of those pairs in which both fragments have a low internal energy.

Original languageEnglish
Pages (from-to)10247-10258
Number of pages12
JournalJournal of Physical Chemistry A
Issue number45
Publication statusPublished - Nov 2000


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