Particle desorption mass spectrometry of YBaCuO superconductors

“…The method used to identify and characterize the ionic species produced in the surface layers of CO 2 -H 2 O ice is time-of-flight secondary ion (SI ± ) mass spectroscopy, TOF SIMS [6], which has been used to analyze other frozen-gas targets (e.g., [7][8][9]). The ice was irradiated by MeV nitrogen ions, which eject from the ice surface the produced atomic and molecular ionic species into vacuum.…”

Section: Introductionmentioning

confidence: 99%

Secondary ion emission from CO2–H2O ice irradiated by energetic heavy ions

Farenzena

Collado

Ponciano

et al. 2005

International Journal of Mass Spectrometry

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“…They developed a technique called 252 Cf-plasma desorption mass spectrometry (PDMS), which proved to be suitable for the analysis of ices, see for instance, [11][12][13][14][15][16][17]. In the presented work, the PDMS technique is applied to the study of the ion emission of CO and CO 2 ices under bombardment by fast projectiles.…”

mentioning

confidence: 99%

Electronic sputtering produced by fission fragments on condensed CO and CO₂

Ponciano

Martínez

Farenzena

et al. 2006

J. Am. Soc. Mass Spectrom.

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Condensed CO and CO2 are bombarded by approximately 65 MeV 252Cf fission fragments and the desorbed ions are analyzed by time-of-flight mass spectrometry as a function of target temperature, in the ranges 25-33 K and 75-91 K, respectively. Absolute desorption yields are measured up to complete ice sublimation. The mass spectra of both ice targets reveal the emission of: (1) low mass ions, produced by direct Coulomb interaction of the highly charged projectiles and delta-electrons with CO and CO2, and (2) pronounced series of cluster ions. The basic ice cluster structures (CO)n and (CO2)n are present in the emitted cluster series such as (CO)nCO+, (CO2)nCO2+, or (CO2)nCO3-. In the case of CO ice, however, the intense production of the series Cn+, Cn-, and (CO)mCn+ shows that Cn is the main cluster structure, consequence of a higher concentration of free carbon atoms in the nuclear track plasma of CO ice than in that of CO2 ice. Ion cluster abundance is observed to decrease exponentially with cluster mass. The decay constant is k(n) congruent with 0.13, about the same for series based on (CO)n and (CO2)n, but a factor 3.3 higher for the Cn series. The Cn clusters are formed by gas-phase condensation, but the (CO)n and (CO2)n clusters are produced by fracturing of the highly excited solid around the nuclear track. A dramatic reduction of the ion desorption yield is observed near T = 29 K for CO and near T = 85 K for CO2, when fast sublimation occurs and ice thickness vanishes. Close to sublimation temperature, the decay constant of the (CO)2Cn+ series increases due to a decreasing formation probability of large Cn clusters.

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Particle desorption mass spectrometry of YBaCuO superconductors

Cited by 8 publications

References 15 publications

Secondary ion emission from condensed CO bombarded by fission fragments

Secondary ion emission from condensed CO bombarded by fission fragments

Secondary ion emission from CO2–H2O ice irradiated by energetic heavy ions

Electronic sputtering produced by fission fragments on condensed CO and CO₂

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Particle desorption mass spectrometry of YBaCuO superconductors

Cited by 8 publications

References 15 publications

Secondary ion emission from condensed CO bombarded by fission fragments

Secondary ion emission from condensed CO bombarded by fission fragments

Secondary ion emission from CO2–H2O ice irradiated by energetic heavy ions

Electronic sputtering produced by fission fragments on condensed CO and CO2

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Product

Resources

About

Electronic sputtering produced by fission fragments on condensed CO and CO₂