KimKT;, KangKS;, ParkMN;, ImranT;, ZhuCJ;, NamCH;, KrishnakumarE;, UmeshG2020-03-312020-03-312006JOURNAL OF THE KOREAN PHYSICAL SOCIETY, 2006, Vol.49, 1, pp.309-313https://idr.nitk.ac.in/handle/123456789/11107Photoionization of oxygen molecules by high-order harmonics was investigated. High-order harmonics of a Ti:sapphire laser produced in a Kr gas cell were used to excite autoionization states of O-2. Since the high-order harmonic source used contains several harmonic orders, the resulting photoelectron spectrum also showed multiple peaks coming from different orders of harmonics. A subtraction method using known photoionization cross-sections was employed to separate out individual contributions from the harmonics. The photoelectron spectrum from the 11th harmonic shows a clean contribution from an autoionizing state.Article