Temperature-Dependent Ultraviolet Photoemission Linewidths of Molecular Solids: 
Isopropyl Benzene

Salaneck, W. R.; Duke, C. B.; Eberhardt, W.; Plummer, E. W.; Freund, Hans-Joachim

doi:10.1103/PhysRevLett.45.280

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Temperature-Dependent Ultraviolet Photoemission Linewidths of Molecular Solids: Isopropyl Benzene

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Salaneck, W. R., Duke, C. B., Eberhardt, W., Plummer, E. W., & Freund, H.-J. (1980). Temperature-Dependent Ultraviolet Photoemission Linewidths of Molecular Solids: Isopropyl Benzene. Physical Review Letters, 45(4), 280-283. doi:10.1103/PhysRevLett.45.280.

Cite as: https://hdl.handle.net/21.11116/0000-000E-71FC-7

Abstract

The temperature (T) dependence of the width of the first ionization potential of condensed films of isopropyl benzene has been measured by ultraviolet photoelectron spectroscopy with use of synchrotron radiation. Over the range 15°K≤T≤150°K, the linewidth exhibits the form δ²(T)=δ²(0)+c²T, where c=4.4 (±0.8)×10^-2 eV/(°K)^1/2. This T dependence originates from the interaction of the photogenerated localized molecular hole states with low-energy vibrational modes of the film.