Electron impact study of the energy levels of trans-1,3-butadiene

The electron impact energy loss spectrum of trans‐1,3‐butadiene has been investigated at incident energies from 7.5 to 34 eV and scattering angles from 0 to 70°. Energy resolutions of 45 to 75 meV were used. The energy loss spectrum at 33 eV and 0° was found to correspond almost exactly to the optical absorption spectrum measured by McDiarmid. The only minor difference was a weak band which appeared in the energy loss spectrum at 7.80 eV. An investigation of the relative intensities of the three diffuse vibronic bands of the intense N→V1 transition centered near 5.92 eV showed that the relative intensities of these bands were not constant below incident energies of 15 eV and that whereas the low energy 5.74 eV vibronic band was enhanced at 0° scattering angle, the high energy 6.08 eV band was enhanced at 70°. These results are consistent with the presence of two forbidden transitions in the 5.7 to 6.2 eV energy loss region: a symmetry forbidden transition near 5.80 eV and a singlet–triplet transition near...

[1]  E. N. Lassettre,et al.  HIGH-RESOLUTION STUDY OF ELECTRON-IMPACT SPECTRA AT KINETIC ENERGIES BETWEEN 33 AND 100 eV AND SCATTERING ANGLES TO 16--. , 1968 .

[2]  A. Kuppermann,et al.  Electron-impact investigation of excited singlet states in 1,3-butadiene , 1978 .

[3]  Philip J. M. Johnson.  The multiphoton ionization spectrum of trans‐1,3‐butadiene , 1976 .

[4]  E. N. Lassettre,et al.  Generalized oscillator strength for the transition A1B2u ← X1A1g in benzene at initial kinetic energies 400 eV and 500 eV , 1977 .

[5]  J. P. Doering,et al.  Inelastic scattering of positive ions and electrons from water: The 4–6 eV energy loss region , 1978 .

[6]  J. P. Doering,et al.  Low‐energy electron impact study of acetone , 1974 .

[7]  R. Mcdiarmid.  On the ultraviolet spectrum of trans‐1,3‐butadiene , 1976 .

[8]  Melvin B. Robin,et al.  Higher excited states of polyatomic molecules , 1974 .

[9]  J. Moore.  Investigation of the low energy singlet-triplet and singlet-singlet transitions in ethylene derivatives by ion impact , 1972 .

[10]  S. Peyerimhoff,et al.  Non-empirical calculations on the electronic spectrum of butadiene , 1972 .

[11]  R. P. Hosteny,et al.  Ab initio study of the π‐electron states of trans‐butadiene , 1975 .

[12]  Klaus Schulten,et al.  Correlation effects in the spectra of polyenes , 1976 .

[13]  J. Moore,et al.  Energies and relative cross sections of singlet–triplet transitions in methyl‐substituted 1,3‐butadienes by ion‐impact spectroscopy , 1978 .

[14]  A. Kuppermann,et al.  Electronic spectroscopy of s‐trans 1,3‐butadiene by electron impact , 1973 .

[15]  M. Robin,et al.  Chemical spectroscopy and photochemistry in the vacuum-ultraviolet : proceedings of the Advanced Study Institute, held under the auspices of NATO and the Royal Society of Canada, August 5-17, 1973, Valmorin, Quebec, Canada , 1974 .

[16]  O. Schnepp,et al.  Absorption and circular dichroism spectra of the cis‐ and trans‐butadiene chromophores α‐ and β‐phellandrene , 1978 .

[17]  S. Peyerimhoff,et al.  All-valence-electron CI treatment of the electronic spectrum of trans-butadiene , 1976 .

[18]  J. P. Doering,et al.  Low‐Energy Electron‐Impact Study of the 12–14‐eV Transitions in Nitrogen , 1969 .

[19]  G. Ellison,et al.  Rydberg states of butadiene , 1977 .