Results 301 to 310 of about 891,565 (361)
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Ambient ionization mass spectrometry: real-time, proximal sample processing and ionization
, 2017The definition of ambient ionization is updated from “no sample preparation” to sample preparation proximal and in real time with the ionization and analysis step.
R. Javanshad, A. Venter
semanticscholar +1 more source
Unraveling the mechanism of electrospray ionization.
Analytical Chemistry, 2013Electrospray ionization (ESI) generates intact gas-phase ions from analytes in solution for mass spectrometric investigations. ESI can proceed via different mechanisms.
L. Konermann +3 more
semanticscholar +1 more source
Photo-ionization of Helium and Ionized Lithium
Proceedings of the Physical Society, 1963The work of Stewart and Wilkinson in 1960 on the photo-ionization of helium using six-parameter Hylleraas ground state and Hartree-Fock continuum wave functions has been entended to higher energies. Agreement to within 10% is obtained with the recent measurements of Baker, Bedo and Tomboulian over the spectral range 504-180 A.
T G Webb, A L Stewart
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Total ionization and ionization fluctuations in helium
Physics Letters A, 1969The mean energy for ion production W, the Fano factor F and some other quantities inherent to electron ionization cascades in helium are computed with semi-empirical cross sections for excitation and ionization. W = 46 eV and F = 0.21 at electron energy of 2.5 keV.
A.A. Vorob'ev, G.D. Alkhazov
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, 1965
The total ionization cross sections of He, Ne, Ar, Kr, Xe, H2, D2, N2, O2, CO, NO, CO2, N2O, and CH4 have been measured from threshold to 1000 eV in a total ionization tube. More limited measurements were performed in C2H4 and SF6.
D. Rapp, P. Englander‐Golden
semanticscholar +1 more source
The total ionization cross sections of He, Ne, Ar, Kr, Xe, H2, D2, N2, O2, CO, NO, CO2, N2O, and CH4 have been measured from threshold to 1000 eV in a total ionization tube. More limited measurements were performed in C2H4 and SF6.
D. Rapp, P. Englander‐Golden
semanticscholar +1 more source
Mass spectrometry: recent advances in direct open air surface sampling/ionization.
Chemical Reviews, 20131. Scope of this Review 2270 2. Ambient Ionization Techniques 2272 2.1. Solid−Liquid Extraction-Based Techniques 2272 2.1.1. Desorption Electrospray Ionization (DESI) 2272 2.1.2. Desorption Ionization by Charge Exchange (DICE) 2277 2.1.3.
M. Monge +3 more
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Electrospray ionization–principles and practice
, 1990Chemistry has its origins as a quantitative science in the careful weighing of products and reactants by Lavoisier and his followers beginning some 200 years ago. Ever since then, the constantly evolving gravimetric balance has been a faithful servant of
J. Fenn +4 more
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Keldysh theory of strong field ionization: history, applications, difficulties and perspectives
, 2014The history and current status of the Keldysh theory of strong field ionization are reviewed. The focus is on the fundamentals of the theory, its most important applications and those aspects which still raise difficulties and remain under discussion ...
S. Popruzhenko
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Studying noncovalent protein complexes by electrospray ionization mass spectrometry.
Mass spectrometry reviews (Print), 1997Electrospray ionization mass spectrometry has been used to study protein interactions driven by noncovalent forces. The gentleness of the electrospray ionization process allows intact protein complexes to be directly detected by mass spectrometry ...
J. Loo
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Negative electrospray ionization via deprotonation: predicting the ionization efficiency.
Analytical Chemistry, 2014Electrospray ionization (ESI) in the negative ion mode has received less attention in fundamental studies than the positive ion electrospray ionization. In this paper, we study the efficiency of negative ion formation in the ESI source via deprotonation ...
A. Kruve +3 more
semanticscholar +1 more source