Parts | Days | Selection | Search | Downloads | Help

MO: Fachverband Molekülphysik

MO 2: Elektronische Spektroskopie

MO 2.2: Talk

Monday, March 10, 2008, 16:45–17:00, 3F

Vibrationally resolved C 1s⁻¹ Auger spectrum of CO₂ — •Vladimir Sekushin¹, Ralph Püttner^1,2, Günter Kaindl¹, Xiao-Jing Liu², Hironobu Fukuzawa², Kiyoshi Ueda², Takahiro Tanaka³, Masamitsu Hoshino³, and Hiroshi Tanaka³ — ¹Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — ²Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan — ³Department of Physics, Sophia University, Tokyo 102-8554, Japan

The high-resolution Auger spectrum of CO₂ subsequent to C 1s⁻¹ photoionization is reported along with the corresponding photoelectron spectrum. Auger transitions to seven quasi-stable final states are observed. They are assigned on the basis of theoretical results in combination with the assumption that the Auger spectrum is dominated by transitions to singlet states. From a Franck-Condon fit analysis of the vibrational progressions in the Auger spectrum, the vibrational energies ℏω, the anharmonicities xℏω and the equilibrium distances R_e for the dicationic final states are derived assuming Morse potentials. The relative intensities of the various C 1s⁻¹ Auger transitions are also obtained.