The photodissociation of singlet ketene by two-step IR+UV excitation

Michael V. Ashikhmin, Axel Mellinger, C. Bradley Moore

Research output: Contribution to journalConference articlepeer-review


The dissociation of ketene (CH2CO) on its singlet potential energy surface has been studied using a two-step photoexcitation, followed by state-selective detection of the CH2 radical via laser-induced fluorescence (LIF). For the first step near 2.8 μm, a commercial optical parametric oscillator (OPO) was actively stabilized with an external reference etalon, allowing scan durations of up to 1 hour. By tuning the wavelength of the UV photolysis laser, photofragment excitation (PHOFEX) spectra of high energy selectivity were recorded. Comparison with phase space theory (PST) calculations shows that the projection K of the angular momentum onto the molecular axis is strongly mixed for K > 0 and that for K = 0 the extent of mixing increases with J.

Original languageEnglish
Pages (from-to)64-70
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1998
EventLaser Techniques for State-Selected and State-to-State Chemistry IV - San Jose, CA, United States
Duration: Jan 29 1998Jan 31 1998


  • Chemical kinetics
  • Laser dissociation
  • Unimolecular reaction dynamics


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