Electric dissociation of negative ions — II

Nadeau, Marie‐Josée; Litherland, A.E.; Garwan, M.A.; Xl, Zhao

doi:10.1016/0168-583x(94)96017-8

Cited by 26 publications

(10 citation statements)

References 6 publications

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“…Also, subsequent experimental studies have confirmed the existence of an excited bound state for La 2 [12]. Nadeau et al have reported measurements of the electron affinities of Tm, Yb, and Dy using an electric field dissociation technique [13], although some of these results are disputed [14]. The relative yields of sputtered negative ions can be used [15].…”

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confidence: 99%

Measurement of the Electron Affinity of Cerium

Davis

Thompson

2002

Phys. Rev. Lett.

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The electron affinity of cerium has been measured using laser photodetachment electron spectroscopy. The electron affinity of Ce(1G4) was determined to be 0.955 +/- 0.026 eV. The data also show that Ce- has at least two bound excited states with binding energies of 0.921 +/- 0.025 eV and 0.819 +/- 0.027 eV relative to the (1G4) ground state of the cerium atom. The present experimental measurements are compared to recent calculations of the energy levels of Ce-. Strong disagreement with the most recent theoretical atomic structure calculations highlights the complicated nature of this particular lanthanide.

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confidence: 99%

Measurement of the Electron Affinity of Cerium

Davis

Thompson

2002

Phys. Rev. Lett.

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“…The reported negative ion production yields for La − and Ce − were much higher than for the other atomic rare-earth anions, indicating that either the electron affinities of lanthanum and cerium are greater than other rare-earth atoms, or La − and Ce − have more than one bound state [9]. Nadeau et al have reported measurements of the electron affinities of Tm, Yb and Dy using an electric field dissociation technique [10]. A subsequent experimental investigation [11] disputed these results, observing no evidence for a stable or metastable state of Yb − with a binding energy greater than 3 meV.…”

mentioning

confidence: 99%

Measurement of the electron affinity of lanthanum

Covington

Calabrese

Thompson

et al. 1998

J. Phys. B: At. Mol. Opt. Phys.

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The electron affinity of lanthanum has been measured using laser photoelectron energy spectroscopy. This is the first electron affinity measurement for lanthanum and one of the first measurements of an electron affinity of a rare-earth series element. The electron affinity of lanthanum was measured to be 0.47 ± 0.02 eV. At least one bound excited state of La − was also observed in the photoelectron spectra, and the binding energy relative to the ground state of lanthanum was measured as 0.17 ± 0.02 eV. The present experimental measurements are compared to a recent calculation.

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“…Low binding energy anions can readily be dissociated in the electric field of an ion source or after the ion source . This has been used, for example, to measure the electron affinity of Ca À by Nadeau et al (1994). In that work it was also shown that Dy À ions were so fragile that the tandem terminal voltage and ion source voltage had to be reduced so that the electric fields throughout the system were less than 0.75 MV/ m for the anions to survive.…”

Section: E Electric Dissociation Of Anions By Electric Fieldsmentioning

confidence: 99%

Mass spectrometry with accelerators

2010

Mass Spectrometry Reviews

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As one in a series of articles on Canadian contributions to mass spectrometry, this review begins with an outline of the history of accelerator mass spectrometry (AMS), noting roles played by researchers at three Canadian AMS laboratories. After a description of the unique features of AMS, three examples, (14)C, (10)Be, and (129)I are given to illustrate the methods. The capabilities of mass spectrometry have been extended by the addition of atomic isobar selection, molecular isobar attenuation, further ion acceleration, followed by ion detection and ion identification at essentially zero dark current or ion flux. This has been accomplished by exploiting the techniques and accelerators of atomic and nuclear physics. In 1939, the first principles of AMS were established using a cyclotron. In 1977 the selection of isobars in the ion source was established when it was shown that the (14)N(-) ion was very unstable, or extremely difficult to create, making a tandem electrostatic accelerator highly suitable for assisting the mass spectrometric measurement of the rare long-lived radioactive isotope (14)C in the environment. This observation, together with the large attenuation of the molecular isobars (13)CH(-) and (12)CH 2(-) during tandem acceleration and the observed very low background contamination from the ion source, was found to facilitate the mass spectrometry of (14)C to at least a level of (14)C/C ~ 6 × 10(-16), the equivalent of a radiocarbon age of 60,000 years. Tandem Accelerator Mass Spectrometry, or AMS, has now made possible the accurate radiocarbon dating of milligram-sized carbon samples by ion counting as well as dating and tracing with many other long-lived radioactive isotopes such as (10)Be, (26)Al, (36)Cl, and (129)I. The difficulty of obtaining large anion currents with low electron affinities and the difficulties of isobar separation, especially for the heavier mass ions, has prompted the use of molecular anions and the search for alternative methods of isobar separation. These techniques are discussed in the latter part of the review.

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Electric dissociation of negative ions — II

Cited by 26 publications

References 6 publications

Measurement of the Electron Affinity of Cerium

Measurement of the Electron Affinity of Cerium

Measurement of the electron affinity of lanthanum

Mass spectrometry with accelerators

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