Mohammad Al-Share

Mohammad Al-Share
Mu’tah University · Physics

PhD

About

26
Publications
1,031
Reads
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32
Citations
Citations since 2016
2 Research Items
14 Citations
20162017201820192020202120220123456
20162017201820192020202120220123456
20162017201820192020202120220123456
20162017201820192020202120220123456
Introduction

Publications

Publications (26)
Article
Full-text available
This study introduces an easy methodology to test and analyze experimental field electron emission current-voltage data from metallic single-tip emitters; this novel and easy methodology is called the Murphy-Good plots. Tungsten electron emitters were used as an example and were prepared by the electrochemical etching process. The current-voltage c...
Article
Full-text available
Background Gestational gigantomastia presents in pregnancy as a rapid and excessive enlargement of the breast reducing the quality of life and causing psychological and physical impairment. Huge axillary enlargement due to Gestational gigantomastia is not mentioned in the literature before. Best treatment remains unclear as conservative and medical...
Article
The rotational constant A0 for the ground state of CH 3NC and CH315NC isotopomers is calculated using a technique which was used earlier for CH3CCH [9], CH3CN [10] and SiH3CCH [11]. This technique is based on calculating the moment of inertia tensors in the bent configuration due to the vs vibrational state, which is associated with the CNC bending...
Article
The rotational constant, A0, for the ground state of SiH 3CCH molecule was calculated using a technique which was used earlier for CH3CCH [Tam H S & Roberts J A. Struct Chem. 1 (1990) 211] and CH3CN [A1-Share M, Hajsaleh J, Qian S W & Roberts J A, Struct Chem, 5 (1994) 109]. This technique is based on calculating the moment of inertia tensors in th...
Article
Full-text available
Some rotational components have been measured in the ground, the n 9 = 1 and the n 10 = 2 vibrational states for 13CH3CCH isotopic species in the frequency range 16--50 GHz. A set of rotational constants has been determined, which gives the best fit between the observed and the calculated frequencies, for each vibrational state. A Fermi resonance w...
Article
The I–V characteristics of ultrathin Ag–SiO multilayer structures having identity periods of ∼109Å is measured under the influence of a variable voltage across the samples and under a variation of temperature in the temperature range 300–35K. The investigation showed insignificant dependence of the samples’ resistances on temperature. However, the...
Article
A spectral study of the methyl cyanide molecule under isotopic substitution was made to determine frequencies for the transitions in the microwave region 10 GHz to 100 GHz to determine molecular parameters for the molecule under substitutions for combinations of a=b=12, c=14 and c=15; a=b=13, c=14 and 15; a=12, b=13 and c=14 and 15 for both hydroge...
Article
Full-text available
The field electron emission cathode was fabricated by vacuum evaporating a magnesium oxide layer, ranging from ∼0.1 to a few tenths of microns thick, onto a tungsten tip. The coated cathodes were heated in air at temperatures between 400°C and 500°C. The electron emission characteristics were studied using the typical method of applying positive vo...
Article
The morphology of melt-crystallized polyethylene is reported. The samples were crystallized for different times at high temperature to produce early stages of spherulitic growth. Morphology studies using transmission electron microscopy showed that the largest proportion of the early objects was monolayers associated with a giant screw dislocation,...
Article
The microwave spectra of the two isotopes (13CH312C15N and 13CH313C15N) of the methyl cyanide molecule in the 3v8, v7 and v4 vibrational energy levels for the rotational components 1<or=J<or=5 (for a range of frequencies 17-95 GHz) were experimentally and theoretically examined. Rotational components in each vibration were measured to determine the...
Article
Measurements were made on the ΔJ = 3 ← 2 and ΔJ = 2 ← 1 rotational transitions in the v9 = 1 and 3 and the v10 = 1 and 2 vibrational components of the vibration rotation spectra of the deuterated propyne molecules to test and compare the "jackknife" method of analysis to standard methods of analysis. Some spectral components in the c9 and the v10 v...
Article
The microwave spectra of the propyne-d4 (CD_3CCD) has been investigated in the available frequency range near 40 GHz. These Measurements enabled us to determine with high accuracy the rotational constants and the l-doubling constants qv for the different excited states nu9 = 1 and 3 and the nu_10 = 1 and 2 vibrations. The "Jackknife" method was use...
Article
Measurements of low J components of the vibration-rotation spectra of $CD_{3}CCD$ propyne were used to obtain some of the vibration-rotational constants for this molecules. Results on components observed in the ground, $v_{10}=1$ and 2 and $v_{9}=1$ and 3 vibrations were compared with those obtained in other laboratories for high J spectral compone...
Article
Measurements made on some low J components of the vibration rotation spectra of $CD_{3}CCD$ propyne were used to refine some of the rotational constants for the molecule in the vibrational states-Rotational components in the ground, $\nu_{10}-1$ and 2 and $\nu_{9} = 1$ and 3 vibrations were measured and analysed in this work. These results are comp...
Article
A technique which was employed earlier to calculate the rotational constants of CH3CCH has been extended to the ground and two vibrational levels in thev 8 vibration of CH3CN for several isotopic species. The moments of inertia and a computer iteration technique over experimental data for each isotopic species were employed to evaluate the constant...
Article
A double modulation microwave spectrometer was used to determine the linewidth parameter for some rotational components in the nν8 vibrations of methyl cyanide under 13C and 15N substitution. The linewidth parameters for self-broadening of the ΔJ=2←1 rotational components for the ground, ν8, and 2ν8 vibrations were determined over a pressure range...
Article
A technique employed earlier to calculate the rotational constants of $CH_{1}OCH$ is extended to the ground and two vibrational levels in the $v_{1}$ vibration of $CH_{1}CN$ for several isotopic species. The moments of inertia and a computer iteration technique over experimental data for each isotopic species were employed to evaluate the constant...
Article
The rotational microwave spectra of the three isotopes (^{13}CH _3^{12}C^ {15}N, ^{12} CH_3^{13}C ^{15}N, and ^ {13}CH_3^{13 }C^{15}N) of the methyl cyanide molecule in the nu _8 = 3, nu_8 = 2, nu_7 = 1 and nu_4 = 1 vibrational energy levels for the rotational components 1 <=q J <=q 5 (for a range of frequency 17-95 GHz.) were experimentally and th...
Article
The methyl cyanide molecule was studied in the $v_{8} = 2$ and 3 vibrations, for rotational energy levels with $1 \leqslant J \leqslant 5$ to establish the trend in the energy level in the frequency range 17 to 95 gHz. Anomalous behaviour in the $^{12}CH_{3} {^{13}}C^{15}N$ rotational spectrum of the $V_{8} = 3$ vibration for the $(K=\pm 1) (\ell =...
Article
Measurements made on some low J components of the vibration rotation spectra of CD3CCD propyne have been used to refine some of the rotational constants for the molecule in the vibrational states. Rotational components in the ground, and v10 = 1 and 2 vibrations were measured and analyzed in this work. These results are compared with those obtained...
Article
A cylindrical microwave resonant cavity in TE011 mode was used to study the response of a sample of gallium arsenide at two different frequencies. The microwave response of this material was studied by using a raw as well as a ground sample. The sample was placed in a fine capillary tube, which in turn was placed into the microwave field of the res...

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Project (1)
Project
This project aims at carrying out the analyses of the relationship between the distribution of a dielectric layer on the field emisssion tip apex of a metal field electron emitter and the distribution of electron emission. Emitters were prepared by coating tungsten emitters with a layer of dielectric materials. A high resolution SEM has ben used to monitor the emitter profile and measure the coating thickness. Field electron microscope has ben used to measure the emission current distribution and spatial distributions from composite emitters (Tungsten-Clark Electromedical Instruments Epoxylite resin [Tungsten/CEI-resin emitter], graphite, Moly slip, ...etc) has been carried out. The effects of thermal treatment, Relaxation processes ... etc are considered and evaluated.