On the photoelectron spectra of HBr and DBr

Delwiche, J.; Natalis, P.; Momigny, J.; Collin, J.E.

doi:10.1016/0368-2048(72)85012-6

Cited by 74 publications

(29 citation statements)

References 4 publications

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“…Moreover, the higher resolution of the present data allows us to resolve for the first time fine features on top of the 7.2 eV band (Fig. 2, 3), which were not observed by Bremner et al [34].…”

Section: Neutral Excited Statessupporting

confidence: 50%

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Electronic states of neutral and ionized tetrahydrofuran studied by VUV spectroscopy and ab initio calculations

et al. 2008

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The electronic spectroscopy of isolated tetrahydrofuran (THF) in the gas phase has been investigated using high-resolution photoabsorption spectroscopy in the 5.8-10.6 eV with absolute cross section measurements derived. In addition, an electron energy loss spectrum was recorded at 100 eV and 10° over the 5-11.4 eV range. The He(I) photoelectron spectrum was also collected to quantify ionisation energies in the 9-16.1 eV spectral region. These experiments are supported by the first high-level ab initio calculations performed on the excited states of the neutral molecule and on the ground state of the positive ion. The excellent agreement between the theoretical results and the measurements allows us to solve several discrepancies concerning the electronic state spectroscopy of THF. The present work reconsiders the question of the lowest energy conformers of the molecule and its population distribution at room temperature.

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Section: Neutral Excited Statessupporting

confidence: 50%

“…The apparatus has been described in detail previously [34]. Briefly, the spectrometer consists of a 180° cylindrical electrostatic analyser with a mean radius of 5 cm.…”

Section: Photoelectron Spectroscopymentioning

confidence: 99%

Electronic states of neutral and ionized tetrahydrofuran studied by VUV spectroscopy and ab initio calculations

et al. 2008

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“…14,15 Briefly, He I photons ͑58.4 nm͒ are produced by a dc discharge in helium. The spectra were recorded by sweeping a retarding voltage in steps of 1 meV between the ionization chamber and the entrance slit of a 180°hemispherical selector electrostatic analyzer, working in constant pass energy mode.…”

Section: A Photoelectron Spectrometermentioning

confidence: 99%

The electronic states of 2-furanmethanol (furfuryl alcohol) studied by photon absorption and electron impact spectroscopies

Giuliani

Walker

Delwiche

et al. 2003

The Journal of Chemical Physics

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The photoelectron spectrum of 2-furanmethanol ͑furfuryl alcohol͒ has been measured for ionization energies between 8 and 11.2 eV and the first three ionization bands assigned to 3 , 2 , and n o ionizations in order of increasing binding energy. The photoabsorption spectrum has been recorded in the gas phase using both a synchrotron radiation source ͑5-9.91 eV, 248 -125 nm͒ and electron energy-loss spectroscopy under electric-dipole conditions ͑5-10.9 eV, 248 -90 nm͒. The ͑UV͒ absorption spectrum has also been recorded in solution ͑4.2-6.36 eV, 292-195 nm͒. The electronic excitation spectrum appears to be dominated by transitions between and * orbitals in the aromatic ring, leading to the conclusion that the frontier molecular orbitals of furan are affected only slightly on replacement of a H atom by the -CH 2 OH group. Additional experiments investigating electron impact at near-threshold energies have revealed two low-lying triplet states and at least one electron/molecule shape resonance. Dissociative electron attachment also shows to be widespread in furfuryl alcohol.

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“…One of the dissociation channels a molecule can choose is the predissociation observed in several neutral and ionized species. Besides the optical spectroscopy methods, predissociations have been investigated by a variety of techniques such as "metastable ion" mass spectrometry [1,2], high resolution translational spectroscopy [3,4] as well as photoelectron spectroscopy [5,6].…”

Section: Introductionmentioning

confidence: 99%

The observation of predissociations in the oxygen molecular ion by low-energy electron impact

Schopman

Locht

1974

Chemical Physics Letters

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The kinetic energy distribution of the O + ions formed by dissociative ionization of O2 has been carefully ex-amined in the range of 0.0 to 1.3 eV. In the peak at 600 meV fine structure is observed and interpreted by predissociation. The high energy side of the peak has been ascribed to the predissociation of the 2 ∆ g , B 2 Σ g -and the c 4 Σ u -states of O 2 + . The low energy side of the peak is presumably due to the predissociation of the b 4 Σ g -state or the Φ u state of O 2 + or to autoionizing predissociation.During the last few years much attention has been paid to the dissociation of diatomic molecules. One of the dissociation channels a molecule can choose is the predissociation observed in several neutral and ionized species. Besides the optical spectroscopy methods, predissociations have been investigated by a variety of techniques such as "metastable ion" mass spectrometry [1,2], high resolution translational spectroscopy [3,4] as well as photoelectron spectroscopy [5,6].The dissociation of the oxygen molecular ion has been the subject of several papers. Doolittle et al. [7] obtained the kinetic energy distribution curve of O + from O 2 by using photoionization mass spectrometry. Freund [8] and Kieffer et al. [9] studied the kinetic energy carried away by the 0 ions formed by electron impact on O 2 . These authors ascribed the first broad and structureless peak, with a maximum at 850 meV, to O + fragment ions formed by predissociation, although no direct experimental evidence was found for this mechanism. Recently Danby and Eland [5] showed experimentally the existence of a predissociation of O 2 by using the photoelectronphotoion coincidence technique.The purpose of this paper is to report our results obtained for the kinetic energy analysis of the O + ions formed by electron impact on molecular oxygen;The instrument used, as well as the experimental conditions will be described elsewhere [10]. Briefly, the ions formed in a conventional Nier-type ion source pass through a retarding potential system before entering into a quadrupole mass spectrometer. The ion current is, at fixed electron energy, continuously scanned with respect to the retarding potential or with respect to electron energy at fixed retarding potential. The first derivative of either the retarding curves or the ionization efficiency curves is stored in a multichannel analyser and plotted on an X-Y recorder.A preliminary report [11] has been devoted to the kinetic energy distribution curve of O + from O 2 , spread over a broad energy range (0 to 12 eV). These results will be published elsewhere [10]. In this letter we will limit our discussion to the results obtained in the energy range of 0 to 1.3 eV.An example of a kinetic energy distribution of O + from O 2 , as observed by the impact of 25 eV electrons, is shown in fig. 1.The first peak maximum is measured at 0.0 eV coinciding with the maximum of the thermal distribution of the molecular ion O 2 , taken as the origin of the kinetic energy scale. The second maximum, meas...

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On the photoelectron spectra of HBr and DBr

Cited by 74 publications

References 4 publications

Electronic states of neutral and ionized tetrahydrofuran studied by VUV spectroscopy and ab initio calculations

Electronic states of neutral and ionized tetrahydrofuran studied by VUV spectroscopy and ab initio calculations

The electronic states of 2-furanmethanol (furfuryl alcohol) studied by photon absorption and electron impact spectroscopies

The observation of predissociations in the oxygen molecular ion by low-energy electron impact

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