Photodissociation processes of a water–oxygen complex cation studied by an ion imaging technique

2020 ◽  
Vol 22 (29) ◽  
pp. 16926-16933
Author(s):  
Yuji Nakashima ◽  
Yuri Ito ◽  
Kenichi Okutsu ◽  
Motoyoshi Nakano ◽  
Fuminori Misaizu
Keyword(s):  
Imaging Technique ◽  
Theoretical Calculations ◽  
Complex Cation ◽  
Ion Imaging ◽  
Oxygen Complex ◽  
Water Oxygen

Photodissociation dynamics of O2+–H2O in the visible and ultraviolet regions was studied by ion imaging experiments and theoretical calculations.

Visible photodissociation study of NO dimer cation using ion imaging technique combined with theoretical calculations

2020 ◽  
Vol 739 ◽  
pp. 137022
Author(s):  
Yuri Ito ◽  
Yuji Nakashima ◽  
Kenichi Okutsu ◽  
Motoyoshi Nakano ◽  
Keijiro Ohshimo ◽  
...  
Keyword(s):  
Imaging Technique ◽  
Theoretical Calculations ◽  
Ion Imaging

Visualizing rotational wave functions of electronically excited nitric oxide molecules by using an ion imaging technique

2018 ◽  
Vol 20 (5) ◽  
pp. 3303-3309 ◽  
Author(s):  
Kenta Mizuse ◽  
Nao Chizuwa ◽  
Dai Ikeda ◽  
Takashi Imajo ◽  
Yasuhiro Ohshima
Keyword(s):  
Nitric Oxide ◽  
Imaging Technique ◽  
Wave Functions ◽  
Ion Imaging ◽  
Rotational Wave ◽  
Electronically Excited ◽  
Slice Imaging

Rotational eigenstates in electronically excited NO molecules have been visualized by a photoion spatial-slice imaging technique.

Uraninite-Water Interactions in an Oxidizing Environment

1996 ◽  
Vol 465 ◽  
Author(s):  
M. Fayek ◽  
T. K. Kyser ◽  
R. C. Ewing ◽  
M. L. Miller
Keyword(s):  
Isotope Fractionation ◽  
Theoretical Calculations ◽  
Uranium Mineralization ◽  
Chemical Compositions ◽  
Uranium Deposits ◽  
Oxygen Isotope Fractionation ◽  
Water Oxygen ◽  
High Level Nuclear Waste ◽  
High Level ◽  
Phase Chemistry

ABSTRACTExceptionally low δ 18O values of primary uraninite and pitchblende (i.e. -32 per mil to -19.5 per mil) from Proterozoic unconformity-type uranium deposits in Saskatchewan, Canada, in conjunction with theoretical uraninite-water oxygen isotope fractionation factors suggest that primary uranium mineralization is not in oxygen isotopie equilibrium with clays and silicates. The low δ 18O values have been interpreted to have resulted from the recrystallization of primary uranium mineralization in the presence of modern meteoric fluids having low δ 18O values of ca. -18 per mil. The absence of apparent alteration in many of the uraninite and pitchblende samples requires that the uranium minerals exchange oxygen isotopes with fluids, with only minor disturbances to their original chemical compositions and textures. However, experiments on the interaction between water and natural uraninites, from these deposits, and detailed electron micro-probe analyses of natural uraninite and pitchblende indicate that, in the presence of water, old uraninite rapidly alters to curite (Pb2U5O174H2O). The hydration of uraninite to curite releases uranium and calcium into solution and becquerelite (Ca(UO2)6O4(OH)6H2O) is precipitated. In the presence of Si-saturated waters, uranium silicate minerals, soddyite ((UO2)2(SiO4)2H2O) and kasolite (Pb(UO2)SiO4H2O are precipitated in addition to, curite and schoepite ((UO2)8O2(OH)12(H2O)12). The mineral paragenesis observed in these experiments is similar to sequences observed in oxidized zones in uranium deposits and UO2-water experiments. Therefore, it is unlikely that natural uraninite and pitchblende can simply exchange oxygen with an oxidizing fluid without a concomitant change in phase chemistry or structure, nor will oxidation of uraninite lead to the formation of U3O7. as predicted by theoretical calculations used in natural analogue studies for the disposal of high level nuclear waste.

scholarly journals Imaging the dynamics of ion–molecule reactions

2017 ◽  
Vol 46 (24) ◽  
pp. 7498-7516 ◽  
Author(s):  
Eduardo Carrascosa ◽  
Jennifer Meyer ◽  
Roland Wester
Keyword(s):  
Charge Transfer ◽  
Proton Transfer ◽  
Nucleophilic Substitution ◽  
Imaging Technique ◽  
Ion Imaging ◽  
Ion Molecule Reactions

A range of ion–molecule reactions have been studied in the last years using the crossed-beam ion imaging technique, from charge transfer and proton transfer to nucleophilic substitution and elimination.

scholarly journals Multi-ionization of the Cl2 molecule in the near-infrared femtosecond laser field

RSC Advances ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 332-337
Author(s):  
Jian Zhang ◽  
Zhipeng Li ◽  
Yan Yang
Keyword(s):  
Femtosecond Laser ◽  
Laser Field ◽  
Near Infrared ◽  
Imaging Technique ◽  
Electron Ionization ◽  
Ion Imaging

The multi-electron ionization and subsequent dissociation of the Cl2 molecule in a near-infrared femtosecond laser field was investigated via the dc-sliced ion imaging technique.

Oxygen Tracer Diffusion in BaTiO3 Ceramics - Effect of Zr Impurity from Planetary Ball Milling

2013 ◽  
Vol 566 ◽  
pp. 262-265 ◽  
Author(s):  
Ken Watanabe ◽  
I. Sakaguchi ◽  
S. Hishita ◽  
H. Haneda ◽  
N. Ohashi
Keyword(s):  
Grain Boundary ◽  
Ball Milling ◽  
Oxygen Diffusion ◽  
Oxygen Vacancies ◽  
Imaging Technique ◽  
Tracer Diffusion ◽  
Milling Process ◽  
Ion Imaging ◽  
Planetary Ball Milling ◽  
Oxygen Tracer

We investigated the effect of Zr impurities on the oxygen diffusion pathway in BaTiO3 ceramics by using an ion-imaging technique. Zr impurities were introduced into BaTiO3 ceramics by a planetary ball milling process. The oxygen tracer diffused quickly from the surface up to the grain boundary and then appeared as discontinuous steps at the grain boundary. The results indicate that the grain boundary acted as a blocking layer against oxygen diffusion. The blocking for oxygen diffusion at the grain boundary is thought to originate during the formation and distribution of complex defects between the charged oxygen vacancies and the Ba vacancies near the grain boundary.

A New Fast Helium Ion Imaging Technique Through Rapid Acquiring and Restoring Using the Point Spread Function Deconvolution Method

2020 ◽  
Vol 26 (S2) ◽  
pp. 1728-1731
Author(s):  
Pouya Tavousi ◽  
Bahar Ahmadi ◽  
Nicholas May ◽  
Sunshine Snider-Drysdale ◽  
Zahra Shahbazi ◽  
...  
Keyword(s):  
Point Spread Function ◽  
Imaging Technique ◽  
Deconvolution Method ◽  
Ion Imaging ◽  
Point Spread ◽  
Helium Ion ◽  
Spread Function

Photodissociation studies of cyclopentyl bromide at 234 and 266nm using velocity ion imaging technique

2011 ◽  
Vol 511 (1-3) ◽  
pp. 39-44 ◽  
Author(s):  
Ahmed Yousif Ghazal ◽  
Yuzhu Liu ◽  
Yanmei Wang ◽  
Changjin Hu ◽  
Bing Zhang
Keyword(s):  
Imaging Technique ◽  
Ion Imaging
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