I photoelectron spectra

K. Kimura, S. Katsumata, Y. Achita, Y. Yamazaki, and S. Iwata. Handbook of He I Photoelectron Spectra of Fundamental Organic Molecules. Halsted Press, New York, 1981. This volume collects together spectra and interpretation for 200 organic molecules. 

Furlani C, Cauletti C (1978) He(I) Photoelectron Spectra of d-metal Compounds. 35 119-169... 

The He(I) photoelectron spectra of compounds 9,10,11,12, 2, 2-H2, 23,23-H2, and 5059) and of 26-29 60> have been recorded. The spectra of peroxides 9, 2, and 23 have been measured independently by another group and the results are in good agreement with ours data for compounds 6,2a, and 20 were also reported 28). 

Figure L He (I) photoelectron spectra of the lowest energy bands of Me%Hg, EtHgMe, -PrHgMe, and t-BuHgMe.

FIGURE 5. The He I photoelectron spectra of compounds 1-4 (1 = EtrGe 2 = Et3GeH 3 = Et2GeH2 4 = EtGeH3). Reproduced by permission of Elsevier Science from Reference 38... 

The photoelectron spectrum of 12 was observed and the measured ionization energies were compared with the orbital energies calculated for the parent tetrasila[2.2]paracyclophane (21). The He I photoelectron spectra of 1 was recorded to have a broad first band at 8.1 eV that was well separated from other bands (22). The first bands of 12 are remarkably different from those of 1. A shoulder at 7.8 eV and a broad band centered at 8.3 eV was observed. A comparison between the band sequence of 12 and 1 based on both empirical and quantum chemical studies shows a smaller through-space and a larger through-bond interaction for 12. The through-bond interaction between the b3u (cr) orbital and the corresponding tt orbital yielded a different orbital sequence in 12 as compared to 1 (Fig. 6). 

FIGURE 6. He I photoelectron spectra of ZnR2, R=Me, Et, t-Bu and neopentyl. Reproduced by permission of The Royal Society of Chemistry from Reference 64... 

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