Precision and accuracy of lifetimes of metastable levels using the Kingdon trap technique

Church, D. A.; Moehs, D. P.; Bhatti, Mohammad

doi:10.1016/s1387-3806(99)00118-9

Cited by 11 publications

(6 citation statements)

References 27 publications

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“…It has also been coupled with electron multipliers, Faraday cups, micro-channel plates and photomultiplier tube detectors for spectroscopic interrogation of trapped ions (Church et al, 1999b;Prior & Wang, 1977;Yang & Church, 1991;. In typical experiments, lifetimes of the metastable electronic states of multiply charged ions are measured (Church, Moehs, & Bhatti, 1999a;, 1999Moehs, Church, & Phaneuf, 1998;Moehs et al, 2000;Moehs, Bhatti, & Church, 2001;Smith, Chutjian, & Greenwood, 1999;Smith et al, 2004;Smith, Chutjian, & Lozana, 2005;Yang et al, 1994), providing diagnostic empirical information about the electron density and temperature in astrophysical and laboratory plasmas (Church, 1993;Church et al, 1999b). Submillimeter glass and copper particles (approximately 50-60 mm in diameter) have been confined in the Kingdon trap to study orbital mechanics, with possible implications for understanding the dynamics of asteroids, galaxies, and planetary rings (Biewer et al, 1994;Robertson, 1995;Robertson & Alexander, 1995).…”

Section: Orbital Trapping and Kingdon Trapsmentioning

confidence: 99%

Orbitrap mass spectrometry: Instrumentation, ion motion and applications

Perry

Cooks

Noll

2008

Mass Spectrometry Reviews

406

290

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Since its introduction, the orbitrap has proven to be a robust mass analyzer that can routinely deliver high resolving power and mass accuracy. Unlike conventional ion traps such as the Paul and Penning traps, the orbitrap uses only electrostatic fields to confine and to analyze injected ion populations. In addition, its relatively low cost, simple design and high space‐charge capacity make it suitable for tackling complex scientific problems in which high performance is required. This review begins with a brief account of the set of inventions that led to the orbitrap, followed by a qualitative description of ion capture, ion motion in the trap and modes of detection. Various orbitrap instruments, including the commercially available linear ion trap–orbitrap hybrid mass spectrometers, are also discussed with emphasis on the different methods used to inject ions into the trap. Figures of merit such as resolving power, mass accuracy, dynamic range and sensitivity of each type of instrument are compared. In addition, experimental techniques that allow mass‐selective manipulation of the motion of confined ions and their potential application in tandem mass spectrometry in the orbitrap are described. Finally, some specific applications are reviewed to illustrate the performance and versatility of the orbitrap mass spectrometers. © 2008 Wiley Periodicals, Inc., Mass Spec Rev 27: 661–699, 2008

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Section: Orbital Trapping and Kingdon Trapsmentioning

confidence: 99%

Orbitrap mass spectrometry: Instrumentation, ion motion and applications

Perry

Cooks

Noll

2008

Mass Spectrometry Reviews

406

290

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“…However, any divergence of the incoming ion beam gives the ions a sideways velocity component so that they probably fill the trap volume during their many revolutions around the central wire, and rather few ions of unspecified charge state are available for the later ion number analysis. The three laboratories have produced lifetime data mostly on C, O, Ar, Mn and Fe [85][86][87][88][89][90][91][92][93][94][95], but the scatter of the results in comparison to other data suggests that the experimental errors in some cases may have been significantly larger than the one or few percent assumed at the time; none of these lifetime data would qualify as highly accurate.…”

Section: Ion Trapsmentioning

confidence: 99%

In pursuit of highly accurate atomic lifetime measurements of multiply charged ions

Träbert

2010

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

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Accurate atomic lifetime data are useful for terrestrial and astrophysical plasma diagnostics. At accuracies higher than those required for these applications, lifetime measurements test atomic structure theory in ways complementary to spectroscopic energy determinations. At the highest level of accuracy, the question arises whether such tests reach the limits of modern theory, a combination of quantum mechanics and QED, and possibly point to physics beyond the standard model. If high-precision atomic lifetime measurements, especially on multiply charged ions, have not quite reached this high accuracy yet, then what is necessary to attain this goal?

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“…The group has operated a satellite laboratory at Reno (Nevada) and has passed on equipment to Caltech (Pasadena, CA; group of A Chutjian). The three laboratories have produced lifetime data mostly on C, O, Ar, Mn, and Fe [30][31][32][33][34][35][36][37][38][39][40].…”

Section: Devices and Techniquesmentioning

confidence: 99%

E1-forbidden transition rates in ions of astrophysical interest

Träbert

2014

Phys. Scr.

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Transition rates in atomic systems may appear to be of little importance in steady-state plasmas that are observed at great distances from Earth. However, some of the transition rates compete with collision rates, and in these cases certain line intensity ratios are affected and can serve as remote indicators of density. In the low-density environments of stellar coronae and planetary nebulae, the transition rates of interest are mostly spin-forbidden E1 decays, higher-multipole order transitions (M1, E2, M2, M3), and hyperfine-induced transitions. On Earth, measurements of the long upper level lifetimes of these atomic systems require the use of ion traps. A fair number of test cases with lifetimes in the range from nanoseconds to many seconds have been treated successfully, and the evolution of calculations along with the experimental progress is notable. A new generation of cold ion traps is expected to extend the atomic lifetime measurements on multiply charged ions into the range of many minutes.

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Precision and accuracy of lifetimes of metastable levels using the Kingdon trap technique

Cited by 11 publications

References 27 publications

Orbitrap mass spectrometry: Instrumentation, ion motion and applications

Orbitrap mass spectrometry: Instrumentation, ion motion and applications

In pursuit of highly accurate atomic lifetime measurements of multiply charged ions

E1-forbidden transition rates in ions of astrophysical interest

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