Fragmentation dynamics of gas-phase furan followingK-shell ionization

2010 ◽  
Vol 82 (1) ◽  
Author(s):  
Z. D. Pešić ◽  
D. Rolles ◽  
I. Dumitriu ◽  
N. Berrah
Keyword(s):  
Gas Phase ◽  
Fragmentation Dynamics ◽  
Shell Ionization

scholarly journals Unusual hydroxyl migration in the fragmentation of β-alanine dication in the gas phase

2015 ◽  
Vol 17 (26) ◽  
pp. 16767-16778 ◽  
Author(s):  
Dariusz Grzegorz Piekarski ◽  
Rudy Delaunay ◽  
Sylvain Maclot ◽  
Lamri Adoui ◽  
Fernando Martín ◽  
...  
Keyword(s):  
Gas Phase ◽  
Theoretical Investigations ◽  
Fragmentation Dynamics

Experimental and theoretical investigations show that hydroxyl migration leads to unexpected fragmentation dynamics of β-alanine dication in the gas phase.

Ultrafast fragmentation dynamics of the cyclopentadien- halogenides in the gas phase

2000 ◽  
Author(s):  
M. Bergt ◽  
N. Damrauer ◽  
C. Dietl ◽  
B. Kiefer ◽  
G. Gerber
Keyword(s):  
Gas Phase ◽  
Fragmentation Dynamics

scholarly journals Ultrafast Nonadiabatic Fragmentation Dynamics of Doubly Charged Uracil in a Gas Phase

2011 ◽  
Vol 107 (2) ◽  
Author(s):  
P. López-Tarifa ◽  
M.-A. Hervé du Penhoat ◽  
R. Vuilleumier ◽  
M.-P. Gaigeot ◽  
I. Tavernelli ◽  
...  
Keyword(s):  
Gas Phase ◽  
Fragmentation Dynamics ◽  
Doubly Charged

Fragmentation Dynamics of Doubly Charged Methionine in the Gas Phase

2014 ◽  
Vol 118 (8) ◽  
pp. 1374-1383 ◽  
Author(s):  
Dang Trinh Ha ◽  
Y. Wang ◽  
M. Alcamí ◽  
E. Itälä ◽  
K. Kooser ◽  
...  
Keyword(s):  
Gas Phase ◽  
Fragmentation Dynamics ◽  
Doubly Charged

Photodissociation dynamics of halogenated aromatic molecules: the case of core-ionized tetrabromothiophene

2021 ◽  
Author(s):  
Lassi Pihlava ◽  
Johannes Niskanen ◽  
Kuno Kooser ◽  
Christian Stråhlman ◽  
Sylvain Maclot ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Gas Phase ◽  
Aromatic Molecule ◽  
Core Shell ◽  
X Ray ◽  
Aromatic Molecules ◽  
Shell Ionization ◽  
Coincidence Spectroscopy

We studied gas-phase photodissociation of a fully halogenated aromatic molecule, tetrabromothiophene, upon core-shell ionization by using synchrotron radiation and energy-resolved multiparticle coincidence spectroscopy. Photodynamics was initiated by selective soft x-ray...

scholarly journals X-ray induced fragmentation dynamics of doubly charged L-alanine in gas phase

2015 ◽  
Vol 635 (11) ◽  
pp. 112094
Author(s):  
Yang Wang ◽  
Helena Levola ◽  
Estefanía Rossich ◽  
Dariusz Piekarski ◽  
Sergio Díaz-Tendero ◽  
...  
Keyword(s):  
Gas Phase ◽  
X Ray ◽  
Fragmentation Dynamics ◽  
Doubly Charged

SIGMAL: A Program for Calculating L-Shell lonization Cross-Sections

1981 ◽  
Vol 39 ◽  
pp. 198-199 ◽  
Author(s):  
R.F. Egerton
Keyword(s):  
Cross Sections ◽  
Fortran Program ◽  
Absorption Data ◽  
X Ray ◽  
Atomic Electrons ◽  
Energy Dependent ◽  
Hydrogenic Model ◽  
Electron Energy Loss ◽  
X Ray Absorption ◽  
Shell Ionization

SIGMAL is a short (∼ 100-line) Fortran program designed to rapidly compute cross-sections for L-shell ionization, particularly the partial crosssections required in quantitative electron energy-loss microanalysis. The program is based on a hydrogenic model, the L1 and L23 subshells being represented by scaled Coulombic wave functions, which allows the generalized oscillator strength (GOS) to be expressed analytically. In this basic form, the model predicts too large a cross-section at energies near to the ionization edge (see Fig. 1), due mainly to the fact that the screening effect of the atomic electrons is assumed constant over the L-shell region. This can be remedied by applying an energy-dependent correction to the GOS or to the effective nuclear charge, resulting in much closer agreement with experimental X-ray absorption data and with more sophisticated calculations (see Fig. 1 ).

Residual Gas Reactions in the Electron Microscope: I. Qualitative Observations on the Water Gas Reaction

1968 ◽  
Vol 26 ◽  
pp. 292-293
Author(s):  
Richard E. Hartman ◽  
Roberta S. Hartman ◽  
Peter L. Ramos
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Gas Phase ◽  
Absolute Temperature ◽  
Residual Gas ◽  
Gas Reactions ◽  
Image Position ◽  
The Right ◽  
Water Gas ◽  
Thinning Rate

The action of water and the electron beam on organic specimens in the electron microscope results in the removal of oxidizable material (primarily hydrogen and carbon) by reactions similar to the water gas reaction .which has the form:The energy required to force the reaction to the right is supplied by the interaction of the electron beam with the specimen.The mass of water striking the specimen is given by:where u = gH2O/cm2 sec, PH2O = partial pressure of water in Torr, & T = absolute temperature of the gas phase. If it is assumed that mass is removed from the specimen by a reaction approximated by (1) and that the specimen is uniformly thinned by the reaction, then the thinning rate in A/ min iswhere x = thickness of the specimen in A, t = time in minutes, & E = efficiency (the fraction of the water striking the specimen which reacts with it).

The measurement of inner-shell ionization cross aections by electron impact in a TEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1266-1267
Author(s):  
Raynald Gauvin ◽  
Gilles L'Espérance
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Weight Fraction ◽  
Thin Foil ◽  
Specimen Thickness ◽  
Ionization Cross ◽  
Electron Dose ◽  
Total Electron ◽  
Inner Shell Ionization ◽  
Shell Ionization

Values of cross sections for ionization of inner-shell electrons by electron impact are required for electron probe microanalysis, Auger-electron spectroscopy and electron energy-loss spectroscopy. In this work, the results of the measurement of inner-shell ionization cross-sections by electron impact, Q, in a TEM are presented for the K shell.The measurement of QNi has been performed at 120 KeV in a TEM by measuring the net X-ray intensity of the Kα line of Ni, INi, which is related to QNi by the relation :(1)where i is the total electron dose, (Ω/4π)is the fractional solid angle, ω is the fluorescence yield, α is the relative intensity factor, ε is the Si (Li) detector efficiency, A is the atomic weight, ρ is the sample density, No is Avogadro's number, t' is the distance traveled by the electrons in the specimen which is equal to τ sec θ neglecting beam broadening where τ is the specimen thickness and θ is the angle between the electron beam and the normal of the thin foil and CNi is the weight fraction of Ni.

Integration of Core-Edge Spectroscopy Methods for the Study of Polymers

1996 ◽  
Vol 54 ◽  
pp. 154-155
Author(s):  
E. G. Rightor
Keyword(s):  
Excited State ◽  
Polymer Blends ◽  
Gas Phase ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Electronic States ◽  
Core Electron ◽  
Bulk Solids ◽  
Development Application

Core edge spectroscopy methods are versatile tools for investigating a wide variety of materials. They can be used to probe the electronic states of materials in bulk solids, on surfaces, or in the gas phase. This family of methods involves promoting an inner shell (core) electron to an excited state and recording either the primary excitation or secondary decay of the excited state. The techniques are complimentary and have different strengths and limitations for studying challenging aspects of materials. The need to identify components in polymers or polymer blends at high spatial resolution has driven development, application, and integration of results from several of these methods.

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