A5045795059- Banana Cultivation and Research
- Advanced Chemical Physics Studies
- Plant Physiology and Cultivation Studies
- Electron and X-Ray Spectroscopy Techniques
- Inorganic Fluorides and Related Compounds
- Plant Micronutrient Interactions and Effects
- Plant responses to water stress
- Nitrogen and Sulfur Effects on Brassica
- Various Chemistry Research Topics
- Plant nutrient uptake and metabolism
- Horticultural and Viticultural Research
- Cassava research and cyanide
- Photocathodes and Microchannel Plates
- Catalysis and Oxidation Reactions
- Agronomic Practices and Intercropping Systems
- Mass Spectrometry Techniques and Applications
- Nuclear Physics and Applications
- Agricultural Science and Fertilization
- Plant Stress Responses and Tolerance
- Photochemistry and Electron Transfer Studies
- Indigenous Health, Education, and Rights
- Atomic and Molecular Physics
- Postharvest Quality and Shelf Life Management
- Leaf Properties and Growth Measurement
- Plant Pathogens and Fungal Diseases
The University of Western Australia
2007-2024
Organisation de Coopération et de Développement Economiques
2014-2022
University of York
2021
KU Leuven
2020
International Institute of Tropical Agriculture
2020
University of Toronto
1981-2020
European Spallation Source
2020
International Institute of Tropical Agriculture
2020
Rutherford Appleton Laboratory
2011-2020
Makerere University
2020
The principal features of helium 584 A photoelectron spectra molecular vapours are outlined. Factors affecting the number bands observed and their relation to occupied electronic energy levels discussed. effect translational velocity on fundamental line widths attainable is considered shown be significant though generally small compared with much more common broadening arising from ionic decomposition. Sharp lines often associated presence classical lone pairs but exceptions noted....
The electronic states of cyclopropane, ethylene oxide, ethylenimine, and diaziridine were investigated using gas-phase condensed-phase vacuum ultraviolet spectroscopy, photoelectron Gaussian orbital self-consistent field calculations. Correlation the optical spectra cyclopropane with first band in its spectrum confirms presence Rydberg transitions involving excitation an electron from 3e′ sigma level. valence shell is complex but dominated by two very strong A11′ → 1E′, σ σ*, excitations....
Abstract The contrasting hydraulic properties of wheat (Triticum aestivum), narrow-leafed lupin (Lupinus angustifolius), and yellow luteus) roots were identified by integrating measurements water flow across different structural levels organization with anatomy modeling. Anatomy played a major role in root hydraulics, influencing axial conductance (L ax) the distribution uptake along root, more localized for aquaporins (AQPs). Lupin had greater L ax than roots, due to xylem development. r)...
The 584 Å (21·22 eV) photoelectron, spectra of the following linear unsaturated molecules are reported: acetylene, dideutero-acetylene, hydrogen cyanide, deuterium diacetylene, dideutero-diacetylene, cyanoacetylene, cyanogen, dicyanoacetylene, methylacetylene and dimethyltriacetylene. ionization potentials molecules, vibrational fine structure observed in many bands, discussed.
Helium 584 Å radiation produces photoeleetron spectra from water and deuterium oxide, which show extensive vibrational fine structure. The results are discussed in terms of the electronic structure molecule, bonding characteristics various molecular orbitals. Water is inferred to have only three configurationally distinct ionization potentials smaller than 21.22 eV.
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLone pair orbitals and their interactions studied by photoelectron spectroscopy. I. Carboxylic acids derivativesD. A. Sweigart D. W. TurnerCite this: J. Am. Chem. Soc. 1972, 94, 16, 5592–5598Publication Date (Print):August 1, 1972Publication History Published online1 May 2002Published inissue 1 August 1972https://doi.org/10.1021/ja00771a011RIGHTS & PERMISSIONSArticle Views337Altmetric-Citations154LEARN ABOUT THESE METRICSArticle Views are the...
M. I. Al-Joboury and D. W. Turner, J. Chem. Soc., 1964, 4434 DOI: 10.1039/JR9640004434
The processes which set fundamental limits to the minimum line widths observable in photoelectron spectroscopy are outlined. An over-all limit of about 0.002 eV is deduced as smallest attainable w idth ordinary circumstances. A photoelectron spectrometer described uses focusing deflexion a radial electrostatic field for energy analysis. This instrum ent has resolution 0.015 eV, smaller than normal width rotational envelopes spectra polyatomic molecules. applications study molecular...
The photoelectron spectra excited by 21.21-eV photons in argon, krypton, xenon, hydrogen, nitrogen, carbon monoxide, oxygen, and nitric oxide have been re-examined using a 180° magnetic-field electron velocity analyzer. In favorable cases peaks corresponding to vibrational levels the resulting positive ion are completely resolved giving directly Franck—Condon factors. Where not fully resolved, relative order of intensities is apparent comparison made with calculations Vibrational structure...
The bananas are thought to be particularly sensitive changes in the environment. This review considers some historical and recent investigations into response of leaf, root reproductive system Monteith's analysis plants intercepted radiation is appropriate for analyzing productivity plantains. banana soil water deficits, expanding tissues such as emerging leaves growing fruit among first affected. As begins dry, stomata close remain highly hydrated, probably through pressure. Productivity...
Photoelectron spectroscopic data for amino- and oxy-benzenes are discussed in terms of a simple p-π interaction scheme. Steric hindrance is shown only to be important ortho substituted NN-dialkylanilines 2,6-dimethylanisole. In the nitrogen series there indication that N atom not planar.
The photoelectron spectra excited by helium 21.2 eV radiation in the group IV halides, AB4, where A = C, Si, Ge, Sn, Ti and B C1, Br, have been determined. ionization potential data are discussed terms of a simple molecular orbital description electronic structures.
The helium I photoelectron spectroscopy of 30 biphenyls is reported. An empirical correlation between certain bands in the spectra and dihedral angle noted its use conformational studies emphasized. interpretation higher energy given terms a Hückel-type theory based on interaction semi-localized π molecular orbitals. Substituent effects are divided into electronic steric means for separating these two factors outlined.
An overview is provided of the 15 neutron beam instruments making up initial instrument suite European Spallation Source (ESS), and being made available to user community. The ESS source consists a high-power accelerator target station, providing unique long-pulse time structure slow neutrons. design considerations behind structure, moderator geometry layout are presented. 15-instrument two small-angle instruments, reflectometers, an imaging beamline, single-crystal diffractometers; one for...
Some aspects of the HeI photoelectron spectroscopy substituted phenylethylenes and related molecules are presented. The interpretation variation π ionization energies with substituents allows separation steric from electronic effects. Interaction semi-localised molecular orbitals incorporated within a Hückel type theory provides means estimation dihedral angles.
The Loq small angle neutron scattering (SANS) instrument at ISIS target station one (TS1) has proved an extremely popular and immensely productive SANS facility over the last 20 years. is routinely operated with a 25 Hz disc chopper removing alternate pulses from 50 source to provide usable wavelength range of 2.2 10 Å. Scattered neutrons are recorded on 0.64 m square 3He multiwire proportional counter (Ordela 2661N) fixed ∼ 4 sample, total flight path 15 decoupled liquid hydrogen moderator...
Photoelectron spectra excited by helium 584 Å radiation in the vapours of benzenoid derivatives have been recorded use a magnetic deflection analyser. Vertical ionisation potentials measured from peaks these interpreted terms electron removal molecular orbitals having energies above –21·21 eV. The results are discussed relation to abilities various substituent groups perturb π and σ orbital levels benzene ring. In particular effect suitably orientated p electrons on degeneracy highest...