Wavelength and vibrational-state dependence of photoelectron angular distributions. Resonance effects in 5σ photoionization of CO

Technical Report · Sat Dec 01 04:00:00 EST 1979

DOI:https://doi.org/10.2172/1178326· OSTI ID:1178326

Cole, B. E. ^[1]; Ederer, D. L. ^[1]; Parr, Albert C. ^[1]; Codling, Keith ^[2]; Stockbauer, Roger ^[1]; Dehmer, Joseph L. ^[3]; West, J. B. ^[4]; Poliakoff, E. D. ^[3]

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1. National Bureau of Standards, Washington, DC (United States), National Measurement Lab.
2. Univ. of Reading (United Kingdom)
3. Argonne National Laboratory (ANL), Argonne, IL (United States)
4. Daresbury Lab., Warrington (United Kingdom)

In a prototype calculation on the 3σ_g photoionization channel of N₂, the σ_u resonance shifted by > 10 eV and exhibited large, asymmetric variations in intensity and width over a range in R spanning the ground vibrational state of N₂. This leads to a breakdown in the Franck-Condon (FC) separation and was predicted to cause non-FC vibrational intensities and v-dependent photoelectron angular distributions. Here we report measurements of vibrationally-resolved photoelectron angular distributions for the 5σ channel in CO, performed in the range 16 eV ≤ h v ≤ 26 eV utilizing synchrotron radiation, in order to establish the gross pattern of variation of the asymmetry parameter β in the vicinity of the σ shape resonance at hv ~ 24 eV.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 1178326
• Report Number(s): ANL--79-65-Pt.1
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS