Time-slice velocity-map ion imaging studies of the photodissociation of NO in the vacuum ultraviolet region
Abstract
The time-slice velocity-map ion imaging and the resonant four-wave mixing techniques are combined to study the photodissociation of NO in the vacuum ultraviolet (VUV) region around 13.5 eV above the ionization potential. The neutral atoms, i.e., N(2Do), O(3P2), O(3P1), O(3P0), and O(1D2), are probed by exciting an autoionization line of O(1D2) or N(2Do), or an intermediate Rydberg state of O(3P0,1,2). Old and new autoionization lines of O(1D2) and N(2Do) in this region have been measured and newer frequencies are given for them. The photodissociation channels producing N(2Do) + O(3P), N(2Do) + O(1D2), N(2Do) + O(1S0), and N(2Po) + O(3P) have all been identified. This is the first time that a single VUV photon has been used to study the photodissociation of NO in this energy region. Our measurements of the angular distributions show that the recoil anisotropy parameters (β) for all the dissociation channels except for the N(2Do) + O(1S0) channel are minus at each of the wavelengths used in the present study. Thus direct excitation of NO by a single VUV photon in this energy region leads to excitation of states with Σ or Δ symmetry (ΔΩ = ±1), explaining the observed perpendicular transition.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 02, 2012
- Source ID
- 10.1063/1.3696897
Entities
People
- C. Y. Ng
- Hong Gao
- Jingang Zhou
- Lei Yang
- William M. Jackson
- Yang Pan
Organizations
- Air Force Office of Scientific Research
- National Aeronautics and Space Administration
- National Science Foundation
- United States Department of Energy
- University of California
- University of Science and Technology of China