An NTD germanium-based microcalorimeter with 3.1eV energy resolution at 6keV

Austin, G.; Beeman, J. W.; Goulding, F.S.; Häller, E. E.; Landis, D.; Madden, N.

doi:10.1016/j.nima.2005.02.024

Cited by 23 publications

(10 citation statements)

References 6 publications

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“…Here, the energy of the Rayleigh-scattered photon and its scattering direction could be measured with high resolution by an array of x-ray calorimeters. Such arrays are currently being developed [54,55] and likely to reach the required energy resolution at the energy of 50 keV in the near future.…”

Section: Prospective Method: Results and Discussionmentioning

confidence: 99%

Photon-photon polarization correlations as a tool for studying parity nonconservation in heliumlike uranium

et al. 2011

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Due to electron-nucleus weak interaction, atomic bound states with different parities turn out to be mixed. We discuss a prospective method for measuring the mixing parameter between the nearly degenerate metastable states 1s 1/2 2s 1/2 : J = 0 and 1s 1/2 2p 1/2 : J = 0 in heliumlike uranium. Our analysis is based on the polarization properties of the photons emitted in the two-photon decays of such states.

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Section: Prospective Method: Results and Discussionmentioning

confidence: 99%

Photon-photon polarization correlations as a tool for studying parity nonconservation in heliumlike uranium

et al. 2011

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“…Their energies can thus prove very useful for spectroscopic line identification. The lines in Table I can furthermore be used in relative energy measurements (for instance, with exotic atoms [29], in astrophysics [55,56], at synchrotron facilities, or with free-electron lasers [57]) or for calibration (e.g., the characterization of x-ray microcalorimeters [58]).…”

Section: Discussionmentioning

confidence: 99%

High-accuracy x-ray line standards in the 3-keV region

et al. 2013

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A set of 14 high-accuracy x-ray transition energies in the 2.4-3.1 keV range is presented, which can be used as x-ray standards. They were measured in two-to four-electron sulfur, chlorine, and argon ions produced in an electron-cyclotron resonance ion source, using a single spherically bent crystal spectrometer. The results include the first measurement of six transitions and improve the accuracy of six other experimental values. These measurements considerably extend the set of high-accuracy x-ray energies reported for highly charged ions. Their relative uncertainties range from 1 to 10 ppm. Theory only reaches such a precision in one-and two-electron ions. Our results thus have two distinct applications. On the one hand, they test predictions in two-electron ions [Artemyev, Shabaev, Yerokhin, Plunien, and Soff, Phys. Rev. A 71, 062104 (2005)], at the precision level of some two-photon QED contributions. We observe an agreement with theory for most of the transitions. On the other hand, the three-and four-electron ion transitions provide new benchmark energies for the calculation of missing theoretical contributions, such as Auger shifts or electronic correlations. Spectra were analyzed with an x-ray tracing simulation that contains all the relevant physics of the spectrometer.

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“…X-ray energy is determined by measuring the temperature rise of the tin as it absorbs the incoming X-ray photon. In comparison to conventional silicon drift detectors, the microcalorimeter has superior energy resolution (3 eV instead of 130 eV at 6 keV X-ray energy) (Silver et al 2005), providing improved element discrimination. Emitted X-rays are focused by the X-ray optic onto the microcalorimeter detector array significantly increasing the collection solid angle of the detector.…”

Section: Analysis Of Particles By X-ray Spectroscopymentioning

confidence: 99%

Exposure and analysis of microparticles embedded in silica aerogel keystones using NF₃‐mediated electron beam–induced etching and energy‐dispersive X‐ray spectroscopy

Martin

Lin

Toth

et al. 2016

Meteorit & Planetary Scien

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Abstract-In 2006, NASA's Stardust spacecraft delivered to Earth dust particles collected from the coma of comet 81P/Wild 2, with the goal of furthering the understanding of solar system formation. Stardust cometary samples were collected in a low-density, nanoporous silica aerogel making their study technically challenging. This article demonstrates the identification, exposure, and elemental composition analysis of particles analogous to those collected by NASA's Stardust mission using in-situ SEM techniques. Backscattered electron imaging is shown by experimental observation and Monte Carlo simulation to be suitable for locating particles of a range of sizes relevant to Stardust (down to submicron diameters) embedded within silica aerogel. Selective removal of the silica aerogel encapsulating an embedded particle is performed by cryogenic NF 3 -mediated electron beam-induced etching. The porous, low-density nature of the aerogel results in an enhanced etch rate compared with solid material, making it an effective, nonmechanical method for the exposure of particles. After exposure, elemental composition of the particle was analyzed by energydispersive X-ray spectroscopy using a high spectral resolution microcalorimeter. Signals from fluorine contamination are shown to correspond to nonremoved silica aerogel and only in residual concentrations.

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An NTD germanium-based microcalorimeter with 3.1eV energy resolution at 6keV

Cited by 23 publications

References 6 publications

Photon-photon polarization correlations as a tool for studying parity nonconservation in heliumlike uranium

Photon-photon polarization correlations as a tool for studying parity nonconservation in heliumlike uranium

High-accuracy x-ray line standards in the 3-keV region

Exposure and analysis of microparticles embedded in silica aerogel keystones using NF₃‐mediated electron beam–induced etching and energy‐dispersive X‐ray spectroscopy

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An NTD germanium-based microcalorimeter with 3.1eV energy resolution at 6keV

Cited by 23 publications

References 6 publications

Photon-photon polarization correlations as a tool for studying parity nonconservation in heliumlike uranium

Photon-photon polarization correlations as a tool for studying parity nonconservation in heliumlike uranium

High-accuracy x-ray line standards in the 3-keV region

Exposure and analysis of microparticles embedded in silica aerogel keystones using NF3‐mediated electron beam–induced etching and energy‐dispersive X‐ray spectroscopy

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Product

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Exposure and analysis of microparticles embedded in silica aerogel keystones using NF₃‐mediated electron beam–induced etching and energy‐dispersive X‐ray spectroscopy