Atomic mass spectrometry

Koppenaal, David W.

doi:10.1021/ac00163a009

Cited by 32 publications

(6 citation statements)

References 716 publications

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“…We now report a simple desorption method in which organic ions are generated efficiently by heating organic salts at atmospheric pressure; we also report reactions of these ions under ambient conditions. Although thermal ionization of low ionization energy elements is well‐known,8, 9 atmospheric‐pressure thermal desorption ionization (APTDI) of organic ions, as reported here, is unprecedented. Appropriate choices of the matrix and solvent strongly increase ion intensities in APTDI.…”

mentioning

confidence: 92%

Dipolar Donor-Acceptor-Substituted Schiff Base Complexes with Large Off-Diagonal Second-Order Nonlinear Optical Tensor Components

Bella¹,

Fragalá²,

Ledoux³

et al. 2001

Chem. Eur. J.

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The synthesis, characterization, and two-dimensional second-order nonlinear optical (NLO) response of a dipolar NiII donor- acceptor Schiff base complex and the related ligand are reported. Electric-field-induced second-harmonic generation and harmonic light (hyper-Rayleigh) scattering techniques, in combination with INDO/SCI-SOS theoretical calculations, were used to investigate the vector part of the hyperpolarizability tensor and the two-dimensional character of the molecular nonlinearity, respectively. Off-diagonal hyperpolarizability tensors can be related to charge-transfer transitions that are polarized perpendicular to the molecular dipolar axis, while parallel transitions account for the diagonal hyperpolarizability tensor. The role of the metal center in enhancing the two-dimensional NLO response of such molecules is twofold since it acts both as the donor and the bridging moiety of the planar donor-(pi-conjugate-bridge)-acceptor system. These dipolar two-dimensional molecules are interesting candidates from the perspective of polarization-independent NLO materials.

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confidence: 92%

Dipolar Donor-Acceptor-Substituted Schiff Base Complexes with Large Off-Diagonal Second-Order Nonlinear Optical Tensor Components

Bella¹,

Fragalá²,

Ledoux³

et al. 2001

Chem. Eur. J.

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“…Glow discharge devices (1) are finding broad analytical use as sources of atoms and ions for atomic absorption (2)(3)(4), atomic emission (5)(6)(7), atomic fluorescence (8-11), resonance ionization (12), and mass spectrometry (13)(14)(15)(16). With continuing research and development into quadrupole based instruments for glow discharge mass spectrometry, along with the installation of a commercial magnetic sector system (17) in an estimated 20 user laboratories (18), applications of glow discharge mass spectrometry appear to be on the verge of a significant expansion. In order to develop adequately the technique of glow discharge mass spectrometry, information on the fundamental processes that result in the formation of sampled ions is of interest.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the relative role of Penning ionization in low-pressure glow discharges

Smith¹,

Serxner²,

Hess³

1989

Anal. Chem.

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Optical Investigations Into the relative role of Penning Ionization as a mechanism for the Ionization of sputtered species In low-pressure argon glow discharges were carried out. These studies employed methane as a quenching agent to effectively reduce the argon metastable population. This reduction of metastable atoms significantly limits the extent of Penning Ionization present In the discharge, which will decrease ion emission signals from the sputtered species. The magnitude of the decrease In these Ion emission signals may then be related to the relative importance of the Penning Ionization process In overall discharge Ionization of the sputtered species. These studies show Penning ionization to account for approximately 40-80% of the ionization of sputtered species, depending upon discharge conditions of current and pressure.

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“…[7] We now report a simple desorption method in which organic ions are generated efficiently by heating organic salts at atmospheric pressure; we also report reactions of these ions under ambient conditions. Although thermal ionization of low ionization energy elements is well-known, [8,9] atmospheric-pressure thermal desorption ionization (APTDI) of organic ions, as reported here, is unprecedented. Appropriate choices of the matrix and solvent strongly increase ion intensities in APTDI.…”

mentioning

confidence: 97%

Thermal Production and Reactions of Organic Ions at Atmospheric Pressure

2006

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Atomic mass spectrometry

Abstract: 224) Maas, A. H. J.; Weisberg, H. F.; Burnett, R. W.; Mueiler-Piathe, 0.; Wlmberley, P. D.; Zijlstra, W. 0.; Durst, R. A.; Siggaard-Andersen, 0. J.

Cited by 32 publications

References 716 publications

Dipolar Donor-Acceptor-Substituted Schiff Base Complexes with Large Off-Diagonal Second-Order Nonlinear Optical Tensor Components

Dipolar Donor-Acceptor-Substituted Schiff Base Complexes with Large Off-Diagonal Second-Order Nonlinear Optical Tensor Components

Assessment of the relative role of Penning ionization in low-pressure glow discharges

Thermal Production and Reactions of Organic Ions at Atmospheric Pressure

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