The ionization energy of methylene (CH2) from a rotationally resolved photoelectron spectrum and its thermochemical implications
2002; American Institute of Physics; Volume: 117; Issue: 5 Linguagem: Inglês
10.1063/1.1496468
ISSN1520-9032
AutoresStefan Willitsch, Lukas L. Imbach, F. Merkt,
Tópico(s)Atmospheric Ozone and Climate
ResumoThe adiabatic ionization potential of methylene has been determined to be 83772±3 cm−1 from a rotationally resolved photoelectron spectroscopic study of the CH2+ X̃ 2A1 (0,0,0)←CH2 X̃ 3B1(0,0,0) transition. This value was used to determine thermochemical quantities such as the 0 K dissociation energy of the ketene cation in CO and CH2+ D0(CH2=CO+)=33202±7 cm−1, the 0 K dissociation energy of the methyl radical D0(CH2–H)=38179±49 cm−1, the 0 K dissociation threshold of methane in CH2 and H2 D0(CH2–H2)=38232±50 cm−1 and the 0 K enthalpy of formation of CH2 ΔfH⊖(CH2,T=0 K)=390.73±0.66 kJ mol−1.
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