An angle-resolved dissociative photoionization study of the c(4)Sigma(-)(u) state in O-2(+) using the TPEPICO technique

作者：Padmanabhan A^*; MacDonald M A; Ryan C H; Zuin L; Reddish T J

来源：Journal of Physics B: Atomic, Molecular and Optical Physics , 2010, 43(16): 165204.

DOI：10.1088/0953-4075/43/16/165204

We have investigated the angular distributions of O+(S-4) ions produced from dissociative photoionization of O(2)(+)c(4)Sigma(-)(u) (nu = 0, 1) using the TPEPICO technique, i.e. by measuring the coincidence yield between threshold photoelectrons and photoions. The vibrational levels have distinctly different lifetimes, tau(nu), which diminish their inherent anisotropic photoion angular distribution characterized by a beta parameter. We obtain tau(1) = 6.0 +/- 0.3 x 10(-14) s and a lower limit on tau(0) of approximate to 1 x 10(-12) s, in broad agreement with other experimental studies using different methods, and find that beta = 0.40 +/- 0.05, which is significantly at variance with the predicted value of >= 1.6.

• 出版日期2010-8-28