PFI - ZEKE spectroscopy using coherent vacuum UV : 0 ; ( a “ II , ) - 02
نویسندگان
چکیده
The PFI-ZEKE spectra of the first four vibrational levels of O;(a “n,) are reported. The rotationally resolved photoelectron spectra were assigned by diagonalizing the appropriate Hamiltonian in a Hund’s case a basis set. An extension of a previous model for rotational line strengths (the BOS model) to the intermediate coupling case was applied to the three vibrational bands with v+ = 1-3. As has been observed with several ?l states in previous ZEKE studies, the intensities of the spin-orbit sub-levels were not in accord with calculated line strengths. The a 411u vibrational levels vt = 0 and 1 were overlapped by the FranckCondon forbidden v’ = 21 and 22 levels of the X *rIs state, allowing for a direct comparison between the intensities of the Franck-Condon allowed and forbidden bands in the ZEKE spectra. These data allowed us to determine an accurate ionization energy for the a 411u state: 129892 lr 2 cm-’ (16.1046 eV).
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