science-softCon uv/vis+ photochemistry database; www.photochemistry.org; (C) science-softCon 2019 Substance: cyclobutadiene Other Names: Formula: C4H4 CAS-No.: 1120-53-2 Study: UV photoelectron spectroscopy Authors: J. Kreile, N. Muenzel, A. Schweig, H. Specht Title: UV photoelectron spectrum of cyclobutadiene. free cyclobutadiene stable up to high temperatures Journal/Source: Chem. Phys. Lett., 124 (2), 140-146, (1986); doi:10.1016/0009-2614(86)85133-8 Data: Energy/Wavelength range: Resolution: Temperature: Temperature dependence: Pressure/Concentration: Phase: gas pH: Comments: The Hel photoelectron spectrum of cyclobutadiene (CB) has been obtained under conditions which demonstrate that free CB is stable up to temperatures of several hundred °C. Author to whom correspondence should be addressed: (e-mail address):