The New Generation of Resonant Laser Ionization Mass Spectrometers: Becoming Competitive for Selective Atomic Ultra-Trace Determination?

2002 ◽  
Vol 8 (4) ◽  
pp. 273-285 ◽  
Author(s):  
Klaus D.A. Wendt
Keyword(s):  
Noble Gas ◽  
Ionization Mass ◽  
Trace Determination ◽  
Laser Ionization ◽  
Mass Spectrometers ◽  
Analytical Technique ◽  
Wide Range ◽  
Resonant Laser ◽  
Ultra Trace ◽  
Resonant Laser Ionization

A critical assessment of the present status of resonant laser ionization mass spectrometry (RIMS) as a specialized analytical technique for the field of atomic ultra-trace determination is attempted and a comparison with established mass spectrometric methods is made. Within the last years RIMS on atomic species has rapidly developed towards becoming a versatile experimental technique, in particular addressing those applications that require high selectivity in respect of isobaric or isotopic interferences. This progress is mainly based on the advent of easy-to-handle tunable solid-state laser systems for both pulsed and continuous operation, which are used in combination with modern compact mass spectrometers. The general basics, analytical potential and the wide range of applicability of these modern RIMS instruments are outlined and investigations on stable and radioactive ultra-trace isotopes are discussed as illustrative examples. These examples concern a variety of analytical applications in alkali, alkaline earth or noble gas elements as well as in lanthanides, actinides and technetium, covering fields of fundamental as well as applied research in environmental protection, geology and geochronology, biomedical and life sciences.

Mechanisms of resonant laser ionization

1997 ◽  
Vol 84 (4) ◽  
pp. 703-715 ◽  
Author(s):  
A. G. Leonov ◽  
D. I. Chekhov ◽  
A. N. Starostin
Keyword(s):  
Laser Ionization ◽  
Resonant Laser ◽  
Resonant Laser Ionization

Nighttime to daytime transition of the oxidation products of isoprene by NO3 radicals

2020 ◽  
Author(s):  
Epameinondas Tsiligiannis ◽  
Rongrong Wu ◽  
Sungah Kang ◽  
Luisa Hantschke ◽  
Joel Thornton ◽  
...  
Keyword(s):  
Gas Phase ◽  
Oxidation Products ◽  
Ionization Mass ◽  
Mass Spectrometers ◽  
Time Profiles ◽  
Compound C ◽  
Wide Range ◽  
Series Of Experiments ◽  
Seed Aerosol

<p>Biogenic volatile organic compounds (BVOC) dominate the overall VOC emissions. Isoprene is the most common BVOC emitted from vegetation, accounting up to 50% of the total BVOC emissions. Despite being emitted in daytime it can accumulate in the stratified nocturnal layer. Thus, the oxidation of isoprene by nitrate radicals (NO<sub>3</sub>) may be of high importance. A series of experiments were conducted in the atmospheric simulation chamber SAPHIR in Jülich, Germany, in order to investigate the gas and particle phase products of the oxidation of isoprene by NO<sub>3</sub>, under a variety of conditions (e.g. high RO<sub>2</sub>, high HO<sub>2</sub>, nighttime to daytime transition, with and without seed aerosol) using a wide range of instrumentation. However, herein the focus is on the results of gas-phase product characterisation using high resolution time of flight chemical ionization mass spectrometers (HR-ToF-CIMS) using iodide or bromide as the primary reagent ion. The use of two HR-ToF-CIMS with different primary reagents provides possibilities to scrutinise the time profiles of isomers of selected products.</p><p>We will discuss qualitatively and quantitatively how the distribution of oxidation products change under different conditions, with a focus on the nighttime daytime transition of the major products and the role of subsequent OH oxidation on the products initially formed by NO<sub>3</sub> oxidation. Generally, the dominant gas phase products include compounds like nitrooxy hydroperoxide (INP) & dihydroxy nitrate (IDHN) (C<sub>5</sub>H<sub>9</sub>NO<sub>5</sub>), carbonyl nitrate (ICN) (C<sub>5</sub>H<sub>7</sub>NO<sub>5</sub>), hydroxy nitrate (IHN) (C<sub>5</sub>H<sub>9</sub>NO<sub>4</sub>), hydroxy hydroperoxy nitrate (IHPN) (C<sub>5</sub>H<sub>9</sub>NO<sub>6</sub>), as well as a C<sub>4</sub> compound (C<sub>4</sub>H<sub>7</sub>NO<sub>5</sub>) among others.</p>

scholarly journals Interpreting and reporting 40Ar/39Ar geochronologic data

2020 ◽  
Author(s):  
Allen J. Schaen ◽  
Brian R. Jicha ◽  
Kip V. Hodges ◽  
Pieter Vermeesch ◽  
Mark E. Stelten ◽  
...  
Keyword(s):  
Noble Gas ◽  
Data Sets ◽  
Mass Spectrometers ◽  
Collateral Information ◽  
Wide Range ◽  
Bearing Materials ◽  
Broad Variety ◽  
Dating Method ◽  
Interpretive Strategies

The 40Ar/39Ar dating method is among the most versatile of geochronometers, having the potential to date a broad variety of K-bearing materials spanning from the time of Earth’s formation into the historical realm. Measurements using modern noble-gas mass spectrometers are now producing 40Ar/39Ar dates with analytical uncertainties of ∼0.1%, thereby providing precise time constraints for a wide range of geologic and extraterrestrial processes. Analyses of increasingly smaller subsamples have revealed age dispersion in many materials, including some minerals used as neutron fluence monitors. Accordingly, interpretive strategies are evolving to address observed dispersion in dates from a single sample. Moreover, inferring a geologically meaningful “age” from a measured “date” or set of dates is dependent on the geological problem being addressed and the salient assumptions associated with each set of data. We highlight requirements for collateral information that will better constrain the interpretation of 40Ar/39Ar data sets, including those associated with single-crystal fusion analyses, incremental heating experiments, and in situ analyses of microsampled domains. To ensure the utility and viability of published results, we emphasize previous recommendations for reporting 40Ar/39Ar data and the related essential metadata, with the amendment that data conform to evolving standards of being findable, accessible, interoperable, and reusable (FAIR) by both humans and computers. Our examples provide guidance for the presentation and interpretation of 40Ar/39Ar dates to maximize their interdisciplinary usage, reproducibility, and longevity.

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