Primary and secondary dissociation pathways in the ultraviolet photolysis of Cl2O Journal Article uri icon



  • The photodissociation of dichlorine monoxide (Cl2O) at 308, 248, and 193 nm was studied by photofragment translational energy spectroscopy. The primary channel upon excitation at 308 and 248 nm was Cl–O bond fission with production of ClO+Cl. A fraction of the ClO photoproducts also underwent spontaneous secondary dissociation at 248 nm. The center-of-mass translational energy distribution for the ClO+Cl channel at 248 nm appeared to be bimodal with a high energy component that was similar in shape to the 308 nm distribution and a second, low energy component with a maximum close to the threshold for the 2Cl+O(3P) channel. Observation of a bimodal distribution suggests that two pathways with different dissociation dynamics lead to ClO+Cl products. The high product internal energy of the second component raises the possibility that ClO is formed in a previously unobserved spin-excited state a 4Σ−. Following excitation at 193 nm, a concerted dissociation pathway leading to Cl2+O was observed in addition to primary Cl–O bond breakage. In both processes, most of the diatomic photofragments were formed with sufficient internal energy that they spontaneously dissociated. The time-of-flight distributions of the Cl2+O products suggest that these fragments are formed in two different channels Cl2(3Π)+O(3P) and Cl2(X 1Σ)+O(1D).

publication date

  • June 1, 1994

has restriction

  • green

Date in CU Experts

  • January 24, 2021 12:44 PM

Full Author List

  • Nelson CM; Moore TA; Okumura M; Minton TK

author count

  • 4

Other Profiles

International Standard Serial Number (ISSN)

  • 0021-9606

Electronic International Standard Serial Number (EISSN)

  • 1089-7690

Additional Document Info

start page

  • 8055

end page

  • 8064


  • 100


  • 11