Introduction

Robin, M. B.

doi:10.1016/b978-0-12-589901-7.50007-0

Cited by 128 publications

(157 citation statements)

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“…In fact, it can be seen that since both the 1r and 1r* orbitals are affected almost identically by methylation, the transition energy should be equal for all three molecules. Robin 46 argues for a location of about 9.0 eV but his value has not been definitively assigned.…”

Section: C_ Discussionmentioning

confidence: 99%

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Electron-impact spectroscopy of acetaldehyde

Walzl

Koerting

Kuppermann

1987

The Journal of Chemical Physics

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Acetaldehyde has been studied by the technique of low-energy variable-angle electron energyloss spectroscopy. With this method the low-lying spin-forbidden transitions have been located via the behavior of the relative differential cross sections, providing the first identification by this technique of such states in acetaldehyde. High-lying states were also investigated and some assignments of dipole symmetry-forbidden/quadrupole symmetry-allowed excitations were made on the basis of characteristic angular behavior, evident for the asymmetric molecule acetaldehyde just as for the symmetric molecules formaldehyde and acetone. Through a comparison of the acetaldehyde results with those for formaldehyde and acetone the trends in the allowed and forbidden transition energies were examined as a function of methyl substitution and found to be relatively linear.

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Section: C_ Discussionmentioning

confidence: 99%

“…For compounds of first row elements 8-1.0 far an s Rydberg series, 8-0.6 for ap Rydberg series, and 8-0.1 for ad Rydberg series. 27 Assignments for the transitions discussed in this research were made primarily on the basis of quantum defects. A n 0 -+ns series is observed out to the n = 9 member and fit with 8 = 0.94.…”

Section: A Acetaldehydementioning

confidence: 99%

Electron-impact spectroscopy of acetaldehyde

Walzl

Koerting

Kuppermann

1987

The Journal of Chemical Physics

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“…The fine structure mostly observed in the low-energy part (b) of the spectrum will be assigned to vibrational excitation associated with the successive Rydberg series. Robin [25] made a critical and extensive review of the analyses of Rydberg transitions and proposed rules and guidelines for assignments. Fig.…”

Section: The Rydberg Transitionsmentioning

confidence: 99%

The vacuum UV photoabsorption spectroscopy of the geminal ethylene difluoride (1,1-C2H2F2). The vibrational structure and its analysis

2012

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The vacuum UV photoabsorption spectrum of 1,1-C 2 H 2 F 2 has been examined in detail between 6 eV and 25 eV photon energy by using synchrotron radiation. The broad band observed at 7.52 eV includes the π → π* and the 2b 1 → 3s Rydberg transitions. An analysis is proposed and applied to the fine structure belonging to these transitions. For the π(2b 1 ) → π* transition, one long vibrational progression is observed with ω 2 = 1475 ± 80cm 1 combined with one quantum of vibration of ω 4 = 976 ± 24cm 1 and its adiabatic excitation energy is determined at 6.742 eV. The 2b 1 → 3s Rydberg transition is characterized by a single progression with ω 2 = 1532 ± 80cm 1 starting at 6.957 eV. These vibrations are ascribed to the C=C and C-F stretching motions respectively. The abundant structure observed between 8.2 eV and 11.2 eV has been analyzed in terms of vibronic transitions to ns (δ = 0.98) and two different np (δ = 0.50 and 0.31) and nd (δ = 0.13 and 0.044) Rydberg series all converging to the 1,1-C 2 H 2 F 2 + (X 2 B 1 ) ionic ground state. An analysis of the associated vibrational structure of the individual Rydberg states has been attempted providing average values of the wavenumbers ω 2 = 1549 ± 16 cm 1 , ω 4 = 839 ± 40 cm 1 and ω 5 = 589 ± 16 cm 1 . Eight other Rydberg states were also analyzed. The vacuum UV spectrum of 1,1-C 2 H 2 F 2 has been recorded for the first time above 11.2 eV and up to 25 eV. Several broad and strong bands are tentatively assigned to transitions to Rydberg states which are members of Rydberg series converging to excited ionic states of 1,1-C 2 H 2 F 2 . For several of these Rydberg states vibrational structures are observed and assignments are proposed.

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“…PePa will be made "VAMDC" compliant so it can be accessed through VAMDC portal [4] allowing its data to be compared with PA and PE data collated in other databases, for example with the solid state databases ACID [20], which reports PA cross sections and albedo (reflection) spectra in the solid (ice) phase. Furthermore, in accord with the traditions of Robin [6][7][8] alkane, alcohol etc.) may be added with a note on theoretical calculations that accompany the experimentally measured spectra.…”

Section: Future Developmentmentioning

confidence: 77%

“…Comparison of photoelectron and photoabsorption spectra provides data on the Rydberg states of atoms and molecules and may inform theoretical calculations of electronic state structure. Nevertheless since the pioneering work of Robin (for PA) [6][7][8] and Turner et al [9] and Berkowitz for (PE) spectroscopy [10] there have only been a few attempts to review and construct a repository for PA and PE e.g. the VPL 1 provides spectral images of photoabsorption data many drawn from the MPI-Mainz-UV-VIS Spectral Atlas of Gaseous Molecules [11] which is primarily aimed at the atmospheric community where photo-fragmentation of aeronomic molecules is a precursor for much of the subsequent chemistry.…”

Section: Introductionmentioning

confidence: 99%